Nuclear, Biological & Chemical Threats

1. Nuclear Threats — Types & Immediate Response

Immediate Sequence After Flash/Blast

1. Flash: Drop instantly — do not look. Get behind mass (wall, car, earthen berm, ditch). Thermal pulse lasts ~3 seconds for 10kt, ~10 seconds for 1Mt.
2. Blast wave: Arrives seconds to minutes after flash (1 mile ≈ 5 sec for 1Mt). Stay down. Glass and debris travel at 100–200 mph. Overpressure damages lungs.
3. Initial radiation: Only danger within ~1 km of ground zero. If you survived the blast, initial radiation has largely passed.
4. Fire: Thermal pulse ignites all combustible material within line-of-sight. Check for fire; evacuate burning structure.
5. Get inside IMMEDIATELY: Fallout begins arriving within 15 minutes downwind. Cover face. Basement or center of large concrete building.
6. Stay 24 hours minimum. Radiation decays by the 7-10 rule. First 24 hours are most dangerous.

2. Blast Radius by Yield

3. Fallout — The Survivable Threat

Fallout is the most dangerous radiation threat to survivors outside the blast zone and the most amenable to protective action. It consists of radioactive particles (vaporized soil, building material, weapon components) that rise into the fireball and settle downwind over hours to days.

The 7-10 Rule

For every 7-fold increase in time after detonation, radiation intensity decreases by a factor of 10:

Shelter Protection Factors

Fallout Shelter Cross-Section

Food & Water Safety After Fallout

4. Kearny Fallout Meter (KFM) — Improvised Dosimeter

The KFM is a proven improvised radiation detector developed by Cresson Kearny at Oak Ridge National Laboratory. It can be built in a few hours and provides cumulative dose readings without electricity.

Materials

• 2 aluminum foil discs (~1 inch diameter) cut from heavy-duty foil
• 2 lengths of very thin sewing thread, 6+ inches each
• Small metal can (soup can) with plastic or cardboard lid
• Silica gel desiccant packets — CRITICAL — keeps foil discs dry so they hold charge
• Magnifying glass for reading
• Nylon comb (for charging)

KFM CONSTRUCTION (Side View Cross-Section)
─────────────────────────────────────────────────────────
              Plastic lid with small window
              (clear tape over a cut-out)
                         ↓
┌──────────────────────────────────────┐
│  ╔══════════════════════════════╗   │ ← Can wall
│  ║  Thread support bar (metal)  ║   │
│  ║        |          |          ║   │
│  ║        ▼          ▼          ║   │
│  ║       [●]        [●]         ║   │ ← Al foil discs
│  ║        ↕ ← gap →  ↕         ║   │   suspended on thread
│  ║                              ║   │
│  ║    [Desiccant packet]        ║   │ ← Keeps foil dry
│  ╚══════════════════════════════╝   │
└──────────────────────────────────────┘
                    Metal can body

HOW IT WORKS:
1. Charge by rubbing comb on hair then touching support bar
   → Discs separate (same charge repels)
2. Radiation ionizes air inside → charge leaks away
   → Discs fall toward each other
3. Measure gap: wide gap = low dose; touching = high dose

See Nuclear War Survival Skills (NWSS) Ch. 13 for
exact calibration table. Free at: oism.org/nwss
─────────────────────────────────────────────────────────

5. Potassium Iodide (KI) Dosing

KI floods the thyroid with stable iodine, preventing uptake of radioactive iodine-131. It protects only the thyroid, and only against radioactive iodine — not other radiation types or doses.

Contraindications: Known iodine allergy, thyroid disease, Dermatitis Herpetiformis. In a genuine nuclear emergency, risk of NOT taking KI generally outweighs allergy risk except for a history of anaphylaxis.

Improvised KI: Topical povidone-iodine (Betadine) painted on skin provides unreliable, minimal absorption. Do not use as a substitute. Pre-stored pharmaceutical KI tablets are the only reliable method.

6. Radiation Sickness Stages & Supportive Care

Radiation Decontamination Protocol

1. Remove outer clothing (outside, before entering shelter) — eliminates ~80% of external contamination. Bag and seal.
2. Shower with soap and water — gentle, not vigorous scrubbing. Scrubbing abrades skin and increases absorption.
3. Shampoo hair — do NOT use conditioner; it binds particles to hair shafts.
4. Blow nose, wipe face gently — remove particles from mucous membranes.
5. Clean under fingernails — common particle trap.
6. Change into clean stored clothing — not from exposed areas.

7. Electromagnetic Pulse (EMP)

What Gets Damaged

Recovery Timeline

8. Faraday Cage Construction

Metal Trash Can Method

FARADAY CAGE — METAL TRASH CAN METHOD
────────────────────────────────────────────────────────
Materials:
  • Steel or galvanized metal trash can with tight lid
  • Cardboard or foam (insulation layer — critical)
  • Heavy-duty aluminum foil (extra wrap for critical items)
  • Conductive tape (copper/aluminum) for lid seam gap

Construction:

         ┌──────────────────────────┐
    Lid →│▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓│← Conductive tape
         │  seals lid-to-can gap   │   seals rim gap
         ├──────────────────────────┤
         │  [Cardboard lining]      │← NON-conductive
         │                          │  insulation prevents
         │  ┌──────────────────┐   │  contact with can wall
         │  │  ELECTRONICS     │   │
         │  │  wrapped in foil │   │← Double-wrap
         │  │  inside cardboard│   │  critical items
         │  └──────────────────┘   │
         │  [Cardboard lining]      │
         └──────────────────────────┘
              Metal can body
              (continuous conductive shell)

RULES:
  ✓ No gaps in metal shell — tape ALL openings
  ✓ Contents must NOT touch metal sides (use insulation)
  ✓ NO ground wire (creates antenna)
  ✓ Lid must make full conductive contact with body
  ✓ Keep sealed until needed after event

NESTED METHOD (critical items):
  Layer 1: Device wrapped in foil in cardboard box
  Layer 2: Metal tin (Altoids to ammo can size)
  Layer 3: Large metal trash can
  Each layer adds ~20 dB of shielding attenuation
────────────────────────────────────────────────────────

Priority Items for Faraday Storage

9. Biological Threats

Natural Pandemic vs. Engineered Pathogen — Early Warning Signs

Quarantine Protocol

Who Quarantines

• Confirmed sick: Immediate isolation. No shared spaces, bathroom, or utensils.
• Known exposed but asymptomatic: Separate from unexposed group. Monitor for symptoms for the full incubation period + 2 days safety margin.
• Unknown exposure status: In active community outbreak, treat everyone as potentially exposed.

Sick Room Setup

• Dedicated room, ideally with own bathroom. Window fan exhausting OUT creates negative pressure — prevents sick-room air from flowing into rest of house.
• Single designated caregiver for each entry (highest immunity, willing). Full PPE every time.
• Separate linens, dishes, waste. Bodily waste: double-bag, seal, dispose far from water sources or burn.
• Door threshold: wet towel soaked in dilute bleach (1 tsp bleach per gallon water).
• Communication between sick and caregivers via walkie-talkie or phone — minimize in-person contact.

Improvised PPE Construction

Decontamination Station Layout

Disinfection Ratios

Vector Control (Without Chemicals)

• Mosquitoes: Eliminate all standing water within 300 feet (buckets, gutters, tarps, tires). Larvae hatch in 7 days. Install bat boxes and dragonfly habitat. Citronella, eucalyptus, and tea tree oil as repellent. Long sleeves and pants at dusk and dawn.
• Rats: Eliminate all food sources — sealed containers, no scraps. Hardware cloth (<¼ inch mesh) over any gap in structures. Snap traps are more effective than poison in grid-down (no secondary kill chain, reusable). Barn cats are highly effective long-term.
• Flies: Secure all waste and feces. Apply lime to latrines. Mesh screens over food preparation areas. Fly strips from sticky tape coated with sugar water.

10. Specific Disease Threats

Mass Casualty Triage (Biological)

Burial & Body Handling

• PPE: Gloves, mask, and eye protection for all handlers. Minimize contact with bodily fluids.
• Document: Record name, approximate time of death, cause if known. Photograph if possible for family notification.
• Burial site: Minimum 50 meters from any water source. Minimum 6 feet deep (prevents animal disturbance). Downhill and downwind from camp/living areas.
• Lime: Agricultural lime in the grave reduces odor and speeds decomposition; does not reliably kill pathogens but reduces surface environmental burden.
• Cremation: Preferred for high-pathogen deaths (hemorrhagic fevers, plague). Requires sustained 1,400°F+. Open-air pyres burn incompletely and may spread aerosols — avoid for suspected bioweapon deaths.
• Records: Maintain a death register for eventual family notification and epidemiological tracking.

11. Chemical Threats — Detection

Detection Without Instruments

• Pattern of casualties: Multiple people rapidly incapacitated with similar symptoms in the same location, especially outdoors with no obvious medical cause.
• Dead animals: Birds, insects, and small animals down near the scene before humans are affected.
• Visible indicators: Oily liquid droplets on surfaces, white or yellow cloud at ground level, unusual puddles with oily sheen, dead vegetation in a pattern.
• Smell indicators: Bitter almonds / peach pits (HCN blood agent), bleach/chlorine (choking agents), newly mown hay / freshly cut grass (phosgene), garlic/mustard (blister agents). Note: sarin nerve agent is nearly odorless — never rely on smell alone.
• Physical sensations: Unexplained eye irritation, chest tightening, excessive saliva or tearing, miosis (pinpoint pupils), muscle twitching.
• NEVER deliberately smell to investigate. A brief involuntary exposure is already significant.

12. Chemical Agent Quick Reference

Nerve Agents — SLUDGE Mnemonic

Salivation  |  Lacrimation (tearing)  |  Urination  |  Defecation  |  GI distress  |  Emesis (vomiting)

Also: miosis (pinpoint pupils), bronchospasm (wheezing, extreme difficulty breathing), muscle twitching progressing to seizures. Death from respiratory failure and asphyxia.

Treatment: Atropine + Pralidoxime (2-PAM) auto-injectors. Without antidote: remove from exposure, fresh air, airway management. Pralidoxime must be given within minutes for fast-acting agents like sarin — delays render it ineffective.

Industrial Chemical Hazards

Many industrial chemicals found near factories, agriculture operations, and utilities pose hazards equivalent to weaponized agents. Know what's within 5 miles of your location.

• Chlorine: Water treatment, pool supplies, manufacturing. Yellow-green cloud. Heavier than air — fills basements and low areas. Move upwind and uphill.
• Ammonia: Cold storage, fertilizer, manufacturing. Lighter than air. Severely burns lungs and eyes. Extremely pungent smell. Large volume water dilution for skin contact.
• Anhydrous Ammonia: Agriculture (fertilizer injection). Cryogenic exposure causes instant frostbite + severe respiratory damage. Extremely hazardous to handle.
• Hydrogen Sulfide (H₂S): Sewers, manure pits, natural gas, oil refineries. Rotten egg smell at low concentrations — HIGH concentrations paralyze smell receptors and you cannot detect it. IDLH: 50 ppm. Lethal rapidly above 300 ppm.
• Carbon Monoxide: Generator exhaust, house fires, incomplete combustion. Colorless and odorless. Headache → confusion → unconsciousness. Treatment: fresh air; pure oxygen if available. Never run generators indoors.

13. Universal Decontamination Principles

Chemical Decontamination Sequence

1. Strip outer clothing — cut off rather than pull over head to avoid re-contaminating face. Bag and seal immediately.
2. Blot (do not rub or scrub) — for liquid agents, blot off skin with dry absorbent material (paper towels, cloth, flour, cornstarch, or dry dirt). Rubbing drives agent deeper into skin.
3. Flush with large volumes of water — minimum 10–15 minutes for skin; 15+ minutes for eyes. Tilt head toward affected eye to avoid cross-contamination.
4. Soap and water wash — after the initial dilution flush, gentle washing with soap.
5. Do NOT use bleach on skin — bleach can react dangerously with some agents and severely damages tissue.

Shelter-in-Place for Chemical Events

• Close all windows, doors, fireplace dampers, HVAC vents. Switch off all HVAC.
• Go to the highest floor available — most chemical agents are heavier than air and settle low.
• Seal gaps under doors and around windows with wet towels or tape.
• If caught outside: move upwind (wind at your back) AND uphill (agents pool in depressions and valleys).
• Improvised respiratory protection: multiple layers of damp cloth provide minutes of protection against chlorine and some irritants — NOT effective against nerve agents.
• Shelter-in-place is effective for 2–4 hours for most industrial spills. After that, agent concentration inside the structure may exceed outside. Monitor emergency broadcasts; evacuate if directed.