NLE Disaster Nursing & Crisis Response — Disaster Nursing & Emergency PreparednessExam Answer Templates

Marks

1

Topic

Concepts and Definitions

Difficulty

easy

Template Id

T1

Examiner Tip

This is a concept-reversal question — examiners specifically test whether you understand that disaster nursing INVERTS the usual 'sickest first' priority. Use the phrase 'greatest good for the greatest number' verbatim.

Model Answer

The primary goal of nursing care during a mass-casualty disaster is to achieve the greatest good for the greatest number of victims, allocating limited resources to save the most lives rather than focusing on one individual patient.

Question Type

very_short_answer

Answer Structure

• Line 1: State the population-level goal using the exact key phrase [1 mark]

Scoring Breakdown

Common Mark Deductions

• Writing 'save the sickest patient first' — this is the routine care goal, NOT the disaster care goal
• Vague answers like 'give the best care possible' without mentioning the population-level principle
• Omitting the resource-allocation concept entirely

Key Phrases To Include

• greatest good for the greatest number
• mass-casualty
• allocate limited resources
• save the most lives

Marks

2

Topic

Concepts and Definitions

Difficulty

easy

Template Id

T2

Examiner Tip

Use a Philippine context example (Typhoon Yolanda / Mayon Volcano eruption) for natural disasters — this shows situational awareness and may earn additional examiner credit for contextualisation.

Model Answer

A natural disaster is caused by natural forces or phenomena of the environment, such as typhoons, earthquakes, volcanic eruptions, or floods — events common in the Philippines given its location along the Pacific Ring of Fire and typhoon belt. A man-made (technological or human-induced) disaster results from human activity or failure, such as industrial chemical spills, building fires, transportation accidents, structural collapse, or acts of terrorism.

Question Type

short_answer

Answer Structure

• Line 1: Define natural disaster + give 1 Philippine-relevant example [1 mark]
• Line 2: Define man-made disaster + give 1 example [1 mark]

Scoring Breakdown

Common Mark Deductions

• Listing examples only without any definitional content — examples alone earn zero for the definition mark
• Using 'accident' as the only man-made example without specifying type
• Confusing pandemic/epidemic as a natural disaster vs. biological agent release as man-made

Key Phrases To Include

• natural forces or phenomena
• human activity or failure
• typhoon
• earthquake
• volcanic eruption
• chemical spill
• structural collapse

Marks

2

Topic

Four Phases of Disaster Management

Difficulty

easy

Template Id

T3

Examiner Tip

Use the mnemonic 'My Parents Really Care' — Mitigation, Preparedness, Response, Recovery — to recall the correct order under exam pressure. Examiners award a separate mark for correct sequence.

Model Answer

The four phases of disaster management in sequential order are: 1. Mitigation — actions taken before a disaster to prevent or reduce its impact. 2. Preparedness — planning and readiness activities before a disaster. 3. Response — actions taken during and immediately after the disaster. 4. Recovery — restoration of the community after the disaster; the longest phase.

Question Type

very_short_answer

Answer Structure

• Item 1: Mitigation (before disaster) [0.5 mark]
• Item 2: Preparedness (before disaster) [0.5 mark]
• Item 3: Response (during/immediately after) [0.5 mark]
• Item 4: Recovery (after; longest phase) [0.5 mark]

Scoring Breakdown

Common Mark Deductions

• Listing phases out of order (e.g., Preparedness before Mitigation) — loses the sequence mark
• Omitting one phase entirely
• Confusing Mitigation with Response — Mitigation is BEFORE the disaster

Key Phrases To Include

• Mitigation
• Preparedness
• Response
• Recovery
• longest phase
• before
• during
• after

Marks

3

Topic

Four Phases of Disaster Management

Difficulty

medium

Template Id

T4

Examiner Tip

The keyword 'has just made landfall' and 'activated the disaster plan' signals Response. Examiners are testing your ability to match real-world events to phases. Always justify your phase identification in one phrase.

Model Answer

The phase now being implemented is the Response Phase — actions taken during and immediately after the disaster to save lives and prevent further harm. Two appropriate nursing activities during the Response Phase are: 1. Conducting rapid mass-casualty triage using the START system to sort and prioritise victims so that the most salvageable receive immediate treatment. 2. Staffing evacuation centres and shelters — monitoring for communicable disease outbreaks, ensuring safe water and sanitation, and providing emergency care to vulnerable groups (children, pregnant women, the elderly, and the chronically ill).

Question Type

short_answer

Answer Structure

• Line 1: Identify the phase correctly — 'Response Phase' [1 mark]
• Line 2: Nursing activity #1 relevant to the Response Phase [1 mark]
• Line 3: Nursing activity #2 relevant to the Response Phase [1 mark]

Scoring Breakdown

Common Mark Deductions

• Identifying 'Preparedness' as the current phase — disaster plan activation happens in Response, not Preparedness
• Listing preparedness activities (e.g., 'conducting drills') as Response activities
• Giving vague activities like 'help patients' without specifying a nursing action

Key Phrases To Include

• Response Phase
• during and immediately after
• START triage
• evacuation
• shelter
• communicable disease surveillance
• vulnerable groups

Marks

2

Topic

START Mass-Casualty Triage

Difficulty

easy

Template Id

T5

Examiner Tip

Remember RPM like a car's 'revolutions per minute' gauge — Respirations, Perfusion, Mental Status. Examiners often deduct for listing 'level of consciousness' instead of 'Mental Status' because it misses the command-following criterion.

Model Answer

START stands for Simple Triage And Rapid Treatment — a mass-casualty triage system designed to sort victims in under 60 seconds each. The three parameters assessed in the START system, in order, are: 1. Respirations (R) 2. Perfusion (P) 3. Mental Status (M) Collectively remembered as RPM.

Question Type

very_short_answer

Answer Structure

• Line 1: Full expansion of the acronym START [1 mark]
• Line 2: All three RPM parameters listed correctly and in order [1 mark]

Scoring Breakdown

Common Mark Deductions

• Writing 'pulse' instead of 'Perfusion' — perfusion is the broader parameter (radial pulse OR capillary refill)
• Listing only 2 of the 3 parameters
• Listing parameters out of order when the question implies sequence

Key Phrases To Include

• Simple Triage And Rapid Treatment
• Respirations
• Perfusion
• Mental Status
• RPM
• 60 seconds

Marks

3

Topic

START Mass-Casualty Triage

Difficulty

medium

Template Id

T6

Examiner Tip

Examiners specifically test whether you can articulate the ethical reversal — that the MOST severely injured are NOT treated first in disasters. Explicitly write 'this reverses the routine nursing priority of the sickest first' to earn extra marks for analysis.

Model Answer

In the START triage system, a BLACK tag (Priority 4 — Expectant/Deceased) is assigned to a victim who: - Is found to be deceased (no breathing after airway repositioning), OR - Has injuries so severe that survival is unlikely even with maximal medical care (expectant). Specifically in START: if a victim is not breathing AND does not begin breathing after the airway is opened/repositioned, the BLACK tag is assigned. Ethical rationale: In a mass-casualty event, the goal shifts from the greatest good for the individual to the greatest good for the greatest number. Expending limited resources (personnel, equipment, supplies) on victims who are unlikely to survive would divert those resources away from salvageable victims (RED-tagged), thereby causing more preventable deaths overall. Black-tagged victims receive comfort care only, not active resuscitation, so that nurses and physicians can direct their efforts where survival is achievable.

Question Type

short_answer

Answer Structure

• Lines 1-2: State the criteria for BLACK tag — deceased OR expectant (unsalvageable); include the START airway-opening step [1 mark]
• Line 3: State the ethical principle — greatest good for the greatest number [1 mark]
• Lines 4-5: Explain the rationale — resource allocation to salvageable victims prevents more deaths [1 mark]

Scoring Breakdown

Common Mark Deductions

• Stating BLACK-tagged patients are treated last without explaining WHY — rationale earns the third mark
• Confusing BLACK with RED (some students think the most injured = RED; BLACK = unsalvageable, not just 'very injured')
• Omitting the airway repositioning step before assigning BLACK
• Saying BLACK patients receive 'no care' — they receive comfort care

Key Phrases To Include

• BLACK tag
• Priority 4
• Expectant/Deceased
• no breathing after airway repositioning
• unsalvageable
• greatest good for the greatest number
• resource allocation
• salvageable victims
• comfort care only

Marks

5

Topic

START Mass-Casualty Triage

Difficulty

hard

Template Id

T7

Examiner Tip

This is the highest-value question type in NLE Disaster Nursing. Examiners award marks per victim, so even if you get one wrong, write justifications for all four to maximise partial credit. Always write the exact criterion value ('>30/min', '>2 seconds') — vague answers like 'breathing too fast' earn no marks.

Model Answer

Using the START triage system (Simple Triage And Rapid Treatment), I assess Respirations (R), Perfusion (P), and Mental Status (M) — RPM — for each non-ambulatory victim after first directing ambulatory victims: Victim A — GREEN (Priority 3, Minor) Justification: Victim A is walking and ambulatory. In START, all victims who can walk are immediately tagged GREEN and directed to a safe area for reassessment later. Victim B — BLACK (Priority 4, Expectant/Deceased) Justification: Victim B is not breathing. The airway was repositioned and breathing was attempted — still no breathing. Per START, no breathing after airway opening = BLACK tag. Resources will not be expended here; comfort measures only. Victim C — RED (Priority 1, Immediate) Justification: Victim C is conscious (mental status assessed — can presumably follow commands if not otherwise stated). However, respiratory rate is 36/min, which is greater than 30/min. Per START, RR > 30/min = RED tag. This victim has a life-threatening but potentially salvageable airway/breathing compromise requiring immediate intervention. Victim D — RED (Priority 1, Immediate) Justification: Victim D's respiratory rate is 22/min (≤ 30 — adequate). Proceeding to Perfusion: capillary refill is 3 seconds, which is greater than 2 seconds. Per START, capillary refill > 2 seconds = RED tag, indicating circulatory compromise (shock). Immediate IV access and fluid resuscitation are priorities. Treatment Priority Order: RED victims (C and D) are treated first as they are salvageable. BLACK (B) receives comfort only. GREEN (A) is reassessed after the critical victims are managed.

Question Type

case_study

Answer Structure

• Opening line: Name the system (START) and the parameters (RPM) [1 mark — method mark]
• Victim A: GREEN + correct ambulatory justification [1 mark]
• Victim B: BLACK + airway-repositioning step mentioned + no-breathing-after-opening criterion [1 mark]
• Victim C: RED + RR > 30/min criterion stated explicitly [1 mark]
• Victim D: RED + capillary refill > 2 seconds criterion stated explicitly [1 mark]

Scoring Breakdown

Common Mark Deductions

• Tagging Victim B as RED instead of BLACK — missing that no-breathing-after-repositioning = BLACK, not RED
• Tagging Victim A as anything other than GREEN — if they can walk, START says GREEN
• Not justifying the tag with the specific RPM criterion — stating 'RED because seriously injured' earns no mark
• Confusing Victim C (RR > 30 = RED) with YELLOW — students who skip the R step tag Victim C as YELLOW incorrectly
• Tagging Victim D as YELLOW — cap refill > 2 s is RED under perfusion, not delayed

Key Phrases To Include

• START
• RPM
• ambulatory
• GREEN Priority 3
• BLACK Priority 4
• airway repositioning
• RED Priority 1 Immediate
• RR greater than 30
• capillary refill greater than 2 seconds
• salvageable
• expectant/deceased

Marks

1

Topic

CBRN Events

Difficulty

easy

Template Id

T8

Examiner Tip

Memorise CBRN as 'Chemical-Bio-Radio-Nuclear'. Even a 1-mark question can distinguish pass from fail on a narrow NLE margin. Write all four words in full — never just initials for the expansion.

Model Answer

CBRN stands for Chemical, Biological, Radiological, and Nuclear events — a classification of hazardous mass-casualty incidents involving deliberate or accidental release of harmful agents requiring specialised protective and decontamination measures.

Question Type

very_short_answer

Answer Structure

• Line 1: Full expansion of CBRN with all four categories correctly named [1 mark]

Scoring Breakdown

Common Mark Deductions

• Writing 'Radioactive' instead of 'Radiological'
• Omitting one of the four categories (most often Radiological is forgotten)
• Writing CBRN without the expansion — the expansion IS the answer

Key Phrases To Include

• Chemical
• Biological
• Radiological
• Nuclear
• hazardous agents
• mass-casualty
• decontamination

Marks

2

Topic

CBRN Events

Difficulty

medium

Template Id

T9

Examiner Tip

This is a concept-trap question. The 'nurse instinct' is to help patients first — but in CBRN, that instinct will kill you. Examiners award the mark ONLY if your first action is PPE/personal safety, not patient care. Memorise: 'Self first, then victim.'

Model Answer

The nurse's FIRST action must be to ensure personal safety by donning appropriate Personal Protective Equipment (PPE) before approaching any casualty or entering the contaminated zone. Rationale: A nurse who becomes a victim of chemical exposure is unable to help any patient and adds to the number of casualties requiring care. In CBRN events, protecting the responder is the absolute first priority — an incapacitated nurse helps no one. Decontamination of victims must also be completed BEFORE they enter the treatment area to prevent secondary contamination of rescuers and healthcare facilities.

Question Type

short_answer

Answer Structure

• Line 1: State the first action — don PPE / ensure personal safety [1 mark]
• Lines 2-3: State the rationale — prevent becoming a casualty; prevent secondary contamination [1 mark]

Scoring Breakdown

Common Mark Deductions

• Writing 'run to help victims immediately' as the first action — this is a critical safety error and earns zero
• Stating 'call for help' as the first action — important but not the answer when PPE is the safety-critical first step
• Providing the correct action but no rationale — loses the second mark

Key Phrases To Include

• Personal Protective Equipment (PPE)
• scene safety
• protect the responder first
• secondary contamination
• decontaminate before treatment
• CBRN

Marks

3

Topic

CBRN Events

Difficulty

hard

Template Id

T10

Examiner Tip

Remember the pairing: Atropine + Pralidoxime — they are always given together for nerve agents. Think of them as a 'duo.' For the sequence, think 'dirty before treated' — decontaminate first, always, unless ABC is compromised simultaneously.

Model Answer

Nerve Agent Antidotes: The two antidotes for nerve agent poisoning are: 1. Atropine — an anticholinergic agent that blocks the excessive acetylcholine stimulation caused by the nerve agent, reversing the cholinergic crisis (excessive secretions, bradycardia, bronchospasm). 2. Pralidoxime (2-PAM) — a cholinesterase reactivator that reverses the binding of the nerve agent to acetylcholinesterase if given early, before the enzyme is irreversibly inactivated. Decontamination vs. Treatment Sequence: Decontamination PRECEDES definitive treatment in nerve agent exposure. The victim's clothing should be removed (removes approximately 70-80% of surface contamination) and skin irrigated copiously with water. Decontamination is performed BEFORE the patient enters the treatment area to prevent secondary contamination of healthcare personnel and facilities. The EXCEPTION is that immediately life-threatening problems (e.g., airway compromise) may require simultaneous intervention with decontamination.

Question Type

short_answer

Answer Structure

• Lines 1-2: Name both antidotes — Atropine AND Pralidoxime [1 mark]
• Line 3: Brief mechanism for each antidote (anticholinergic; cholinesterase reactivator) [1 mark]
• Lines 4-5: Decontamination before treatment — with the exception for immediate life threats [1 mark]

Scoring Breakdown

Common Mark Deductions

• Writing only Atropine and forgetting Pralidoxime — loses half the antidote mark
• Reversing the sequence — writing 'treat first, then decontaminate' is a critical error
• Omitting the exception for immediately life-threatening problems — loses nuance mark

Key Phrases To Include

• Atropine
• Pralidoxime
• anticholinergic
• cholinesterase reactivator
• decontamination before treatment
• remove clothing
• copious water irrigation
• secondary contamination
• exception — immediate life-threatening

Marks

2

Topic

Philippine Legislative Framework

Difficulty

easy

Template Id

T11

Examiner Tip

Distinguish RA 10121 (DRRM — disaster law) from RA 9173 (Nursing Act). Examiners know students confuse these. The NDRRMC is a Council, not a Commission — the distinction matters. Also mention 'risk reduction' emphasis to show you understand the law's landmark shift.

Model Answer

The Philippine law governing disaster risk reduction and management is Republic Act 10121, known as the Philippine Disaster Risk Reduction and Management Act of 2010. RA 10121 created the National Disaster Risk Reduction and Management Council (NDRRMC), which coordinates DRRM efforts from the national level down to barangay-level DRRM councils and offices. The law shifted national policy from reactive disaster response toward proactive disaster risk reduction.

Question Type

very_short_answer

Answer Structure

• Line 1: Correctly name RA 10121 and its full title [1 mark]
• Line 2: Name the NDRRMC and describe its function/level [1 mark]

Scoring Breakdown

Common Mark Deductions

• Writing RA 9173 (this is the Philippine Nursing Act — a different law!) instead of RA 10121
• Calling the body 'NDRRMO' (office) instead of 'NDRRMC' (council)
• Writing the year incorrectly (it is 2010, not 2009 or 2012)

Key Phrases To Include

• Republic Act 10121
• Philippine Disaster Risk Reduction and Management Act of 2010
• National Disaster Risk Reduction and Management Council
• NDRRMC
• disaster risk reduction
• barangay level

Marks

5

Topic

Psychological First Aid

Difficulty

medium

Template Id

T12

Examiner Tip

This is a high-synthesis question worth 5 marks. Examiners reward students who demonstrate that they know what PFA is AND what it is not. The 'not debriefing' point is a specific examiner test. Use 'Look-Listen-Link' as your structural framework — it organises your answer and signals to the examiner you know the content.

Model Answer

Psychological First Aid (PFA) is the recommended immediate psychosocial support intervention for disaster survivors and individuals exposed to traumatic events. It is designed to reduce acute psychological distress, promote coping, and link survivors to resources. PFA is NOT formal psychotherapy, and routine critical incident 'debriefing' (forcing survivors to recount their trauma) is no longer recommended as an early intervention. The three core actions of PFA — Look, Listen, and Link: 1. LOOK: The nurse observes the environment for safety, identifies individuals with obvious urgent basic needs (food, water, medical care), and recognises those in serious psychological distress who need immediate support. 2. LISTEN: The nurse approaches distressed survivors in a calm, non-intrusive manner. She listens actively to their needs and concerns and helps them feel calm — without pressuring them to talk about the traumatic event. PFA respects the survivor's pace and choice. 3. LINK: The nurse connects survivors with basic needs and services (food, shelter, clean water, medical care), provides accurate and reliable information, reunites families and loved ones, and facilitates referral to professional mental health services for those with severe reactions. PFA promotes five principles: Safety, Calming, Self- and Community-Efficacy, Connectedness, and Hope. Two appropriate nursing interventions for disaster survivors: 1. Meeting basic physiological and safety needs first (Maslow's Hierarchy) — ensuring access to clean water, food, shelter, and physical safety before addressing emotional needs, as unmet basic needs maintain physiological stress responses. 2. Identifying and referring survivors with severe psychological reactions — such as acute dissociation, suicidal ideation, or inability to function — to professional mental health teams for formal psychiatric evaluation and therapy. Note: Nurses must also protect their own mental health, as vicarious trauma, compassion fatigue, and burnout are real occupational risks during prolonged disaster response.

Question Type

long_answer

Answer Structure

• Paragraph 1: Define PFA and clarify what it is NOT (not therapy, no routine debriefing) [1 mark]
• Paragraph 2-4: Explain all three core actions — LOOK, LISTEN, LINK — with specific content for each [2 marks — 1 mark for all three named, 1 mark for substantive content in each]
• Line: Name the 5 PFA principles [0.5 mark — bonus/additional depth]
• Paragraph 5-6: Two specific nursing interventions, with rationale [1 mark]
• Final note: Responder self-care [0.5 mark — depth/analysis mark]

Scoring Breakdown

Common Mark Deductions

• Describing PFA as 'counselling' or 'therapy' — PFA is explicitly NOT formal therapy
• Recommending 'group debriefing' or 'encourage them to talk about what happened' — this is the old, now-discouraged approach
• Listing only 2 of the 3 core actions
• Not applying Maslow — physiological and safety needs first before emotional support
• Describing interventions without rationale — just listing 'listen to them' earns zero for the intervention marks

Key Phrases To Include

• Psychological First Aid
• Look Listen Link
• NOT therapy
• debriefing not recommended
• non-coercive
• safety calming efficacy connectedness hope
• basic needs first
• Maslow
• refer to mental health
• vicarious trauma
• responder self-care

Marks

3

Topic

Patient and Family Teaching

Difficulty

easy

Template Id

T13

Examiner Tip

The rationale mark is where most students fail this question — they list the item but give no explanation. Tie each item to a specific disaster scenario (floods → leptospirosis risk; earthquakes → hospital inaccessibility). Philippine context scores extra depth.

Model Answer

A family disaster go-bag should include the following essential items: 1. Potable water and water purification tablets — Water is the most critical survival resource; access to safe water is disrupted in most disasters (floods, earthquakes). Without safe water, the risk of dehydration and waterborne diseases (typhoid, cholera, leptospirosis — highly prevalent in Philippine post-disaster settings) increases rapidly. 2. Essential medications (a 3-7 day supply) and a first-aid kit — Chronic disease management (e.g., antihypertensives, insulin, antiseizure medications) cannot be interrupted. A first-aid kit addresses immediate injuries (lacerations, minor fractures) when hospital access is disrupted. 3. Copies of important documents (government IDs, health records, insurance) in a waterproof container — Documentation is needed for evacuation registration, accessing government aid, medical treatment decisions, and insurance claims during the recovery phase.

Question Type

short_answer

Answer Structure

• Item 1: Name the item + specific disaster-relevant rationale [1 mark]
• Item 2: Name the item + specific disaster-relevant rationale [1 mark]
• Item 3: Name the item + specific disaster-relevant rationale [1 mark]

Scoring Breakdown

Common Mark Deductions

• Listing items without rationale — the question explicitly asks 'why each item is important'; items alone earn 0
• Vague rationale like 'because it is useful' — must be disaster-specific and clinically relevant
• Repeating the same category (e.g., two types of food without mentioning water or medications)

Key Phrases To Include

• go-bag
• potable water
• essential medications
• first-aid kit
• important documents
• waterborne diseases
• evacuation
• chronic disease management
• disaster preparedness

Marks

3

Topic

Four Phases of Disaster Management

Difficulty

medium

Template Id

T14

Examiner Tip

The most common confusion is Mitigation vs. Preparedness. Remember: Mitigation tries to PREVENT the disaster or reduce its effect (building codes, hazard mapping). Preparedness tries to be READY when the disaster happens (drills, stockpiles, plans). Both are before, but the purpose differs.

Model Answer

Mitigation Phase: Mitigation refers to actions taken BEFORE a disaster occurs with the goal of preventing the disaster entirely or reducing its severity and impact. It is the first phase of the disaster management cycle. Nursing activity example: Conducting hazard-vulnerability assessments of health facilities to identify structural weaknesses and recommend reinforcement measures; or educating the community on flood-control practices and risk reduction. Recovery Phase: Recovery refers to actions taken AFTER the disaster response — the restoration of the community to normal or improved functioning. It is the LONGEST phase of the disaster management cycle. Nursing activity example: Providing ongoing physical and mental health care (including PFA and referral for PTSD) to survivors at temporary resettlement sites; conducting disease surveillance and outbreak monitoring during the recovery period; or evaluating the disaster response to identify lessons learned for future mitigation planning. Key distinction: Mitigation is BEFORE (preventive); Recovery is AFTER (restorative). Preparedness is also before, but focuses on readiness rather than risk reduction.

Question Type

short_answer

Answer Structure

• Lines 1-2: Define Mitigation correctly — before, preventive, first phase [1 mark]
• Line 3: One specific nursing activity for Mitigation [0.5 mark]
• Lines 4-5: Define Recovery correctly — after, restorative, longest phase [1 mark]
• Line 6: One specific nursing activity for Recovery [0.5 mark]

Scoring Breakdown

Common Mark Deductions

• Confusing Mitigation with Preparedness — both are 'before' the disaster but Mitigation = risk reduction, Preparedness = readiness planning
• Describing drills and stockpiling as Mitigation activities — these are Preparedness activities
• Giving a Response activity (e.g., triage) as a Recovery activity

Key Phrases To Include

• Mitigation
• before disaster
• prevent or reduce impact
• Recovery
• after disaster
• restore community
• longest phase
• hazard assessment
• disease surveillance
• lessons learned

Marks

3

Topic

CBRN Events

Difficulty

medium

Template Id

T15

Examiner Tip

Radiation protection principles are tested as a triad — all three must be named. For KI, emphasise its specificity: thyroid + radioactive iodine only. A common NLE distractor states KI 'protects the whole body' — this is false. Writing 'thyroid-specific only' explicitly shows examiner-level precision.

Model Answer

The three principles of radiation protection are: 1. TIME — Minimise the amount of time spent near the radiation source. The dose of radiation received is directly proportional to exposure time; reducing time in the contaminated zone reduces total dose absorbed. 2. DISTANCE — Maximise the distance between the responder and the radiation source. Radiation intensity decreases with the square of the distance (inverse square law) — doubling the distance reduces exposure to one-quarter. 3. SHIELDING — Use appropriate physical barriers (lead aprons, concrete walls, evacuation to a building interior) between the responder and the radiation source to absorb or reduce radiation penetration. Role of Potassium Iodide (KI): Potassium iodide protects the thyroid gland specifically from radioactive iodine-131 (a common product of nuclear explosions or reactor accidents). When administered before or shortly after exposure to radioactive iodine, potassium iodide saturates the thyroid with stable (non-radioactive) iodine, preventing the thyroid from absorbing the radioactive form. KI does NOT protect against other types of radiation or other body organs — it is thyroid-specific only.

Question Type

short_answer

Answer Structure

• Line 1-2: State and explain Time principle [0.5 mark]
• Line 3-4: State and explain Distance principle [0.5 mark]
• Line 5-6: State and explain Shielding principle [0.5 mark]
• Lines 7-9: Explain potassium iodide role — thyroid-specific, stable iodine saturation, radioactive iodine prevention [1.5 marks]

Scoring Breakdown

Common Mark Deductions

• Naming only 2 of the 3 principles
• Stating potassium iodide 'protects against all radiation' — it is ONLY for the thyroid and ONLY against radioactive iodine
• Not explaining the mechanism of KI (saturation of thyroid with stable iodine) — just saying 'it protects' earns no marks

Key Phrases To Include

• Time
• Distance
• Shielding
• radiation protection
• potassium iodide
• thyroid gland
• radioactive iodine
• iodine-131
• saturates
• thyroid-specific