Radiation Accidents Management

Intro & Initial Response - Uh Oh, Glow!

Radiation Accident: Unplanned event; actual/potential radiation exposure or contamination. Goals: save lives, prevent harm escalation, mitigate consequences.

• Priorities:
  • Treat life-threatening non-radiological injuries FIRST (ABCDE).
  • Prevent further exposure & contamination spread.
  • Rapidly assess radiological situation & hazards.
• Initial Actions (📌 SHINE):
  • Secure area: Cordon off, control access.
  • Help injured: Triage; trauma first. Stabilize.
  • Identify contamination: Survey meters, define boundaries.
  • Notify: RSO, local/national authorities (AERB/BARC).
  • Evacuate: If needed, upwind from source. Shelter-in-place if appropriate.

⭐ Life-threatening non-radiological injuries (trauma, burns) ALWAYS take precedence over radiological concerns in initial management.

Victim Assessment & Triage - Zap Zone Checkup

• Initial "Zap Zone" Checkup:
  • Rapid ABCDE survey for life threats.
  • Identify highest risk: early severe symptoms (vomiting <1hr, CNS signs), known high exposure.
  • Detect external contamination: Geiger-Müller counters.
• Triage Categories (Clinical & Dosimetric):
  • Cat 1 (Expectant): Dose > 8-10 Gy. Severe early neurovascular symptoms. Palliative care.
  • Cat 2 (Survival Probable): Dose 2-8 Gy. Prodromal (vomiting 1-2 hrs post-exposure). Hospitalize, supportive care, G-CSF.
  • Cat 3 (Survival Likely): Dose < 2 Gy. Mild/delayed or no symptoms. Outpatient monitoring.
  • Cat 4 (Minimal): No significant exposure/symptoms. Reassure.
• Biological Dosimetry:
  • Blood: Lymphocyte count (kinetics), Dicentric Chromosome Assay (DCA).
  • 📌 Nausea/vomiting onset time: rough dose estimate.

⭐ Lymphocyte count at 48 hours is key. Nadir < 0.5 x 10⁹/L (< 500/µL) suggests severe exposure (likely >4 Gy).

Decontamination & Decorporation - Scrubbing Rads Away

1. External Decontamination:

• Remove clothing (↓ ~90% contamination).
• Gentle wash: soap, lukewarm water. Avoid abrasion (↓ absorption).
• Clean cleaner to dirtier areas. Collect waste water.
• Care: hair, nails, folds.

2. Internal Decontamination (Decorporation):

• Goal: ↓ absorption, ↑ excretion.
• Agents:
  • KI: For radioactive Iodine ($^{131}I$). Blocks thyroid.
  • DTPA: For Plutonium ($Pu$), Americium ($Am$), Curium ($Cm$). Chelates.
  • 📌 Prussian Blue: For Caesium ($^{137}Cs$), Thallium ($^{201}Tl$). Binds in gut.
  • Water: For Tritium ($^3H$). Dilution.
  • Diuretics/Laxatives: Enhance excretion.

⭐ Prussian Blue (Ferric Hexacyanoferrate) for Caesium-137 & Thallium-201 internal contamination significantly reduces biological half-life.

ARS & LRI Management - Healing Ray Harm

• Core Management:
  • Aggressive supportive care: fluids, electrolytes, antiemetics, antibiotics, pain relief.
  • Regular monitoring: CBC, electrolytes, organ function.
• Hematopoietic ARS (H-ARS):
  • Cytokines (G-CSF/GM-CSF): If neutrophils < 0.5 x 10⁹/L or expected nadir < 0.5 x 10⁹/L.
  • Transfusions: Platelets if < 10-20 x 10⁹/L; RBCs for anemia.
  • Stem Cell Transplant (SCT): For whole-body dose > 7-10 Gy.
• Gastrointestinal ARS (GI-ARS):
  • Aggressive fluid/electrolyte replacement.
  • Parenteral nutrition.
• Local Radiation Injury (LRI):
  • Pain management.
  • Wound care: debridement, specialized dressings.
  • Pentoxifylline & Tocopherol for fibrosis.
  • Surgery for severe necrosis.

⭐ G-CSF (e.g., Filgrastim) is crucial for H-ARS if neutrophils fall below 0.5 x 10⁹/L, significantly improving survival.

High‑Yield Points - ⚡ Biggest Takeaways

• Prioritize external decontamination (remove clothes, wash) then internal decontamination (e.g., Prussian Blue for Cs-137, DTPA for transuranics).
• Triage victims based on clinical symptoms, exposure history, and lymphocyte depletion kinetics.
• Manage Acute Radiation Syndrome (ARS) syndromes: Hematopoietic (G-CSF, transfusions), Gastrointestinal (fluids, antiemetics), Neurovascular (supportive).
• Administer Potassium Iodide (KI) promptly to block thyroid uptake of radioactive iodine.
• Supportive care (fluids, infection control, pain management) is paramount for ARS victims anagement