Time Phases of Acute Radiation Syndrome (ARS) - Dose Range 1-2 Gy
Dose Range in gray (Gy)
(What is gray?)
Data adapted from:
Diagnosis and Treatment of Radiation Injuries
(PDF - 202 KB)
(IAEA Safety Reports Series No. 2, Vienna 1998)
Timeline: 1-2 Gy
ARS time phases and approximate whole body dose from exposure: 1-2 Gy
||Manifest Illness (Critical Phase)
||Recovery or Death
Level of consciousness
- Onset: 2 hours after exposure or later
- Percent of victims who vomit at this dose: ~10-50%
- Outpatient observation
- Hospitalization generally not necessary unless victim has underlying immunocompromise, trauma, chronic illness, etc., that predispose to a worse outcome.
- From end of prodrome through day 21-35
- Hospitalization generally not necessary.
- Post-event monitoring may be assisted by laboratory tests that estimate dose, e.g., sequential CBCs and dicentric chromosomes.
Possible clinical effects
- Depends on dose and underlying host factors
- None likely from radiation alone
- As needed for signs/symptoms
- Counseling and long-term effects monitoring may be helpful
- Expected unless complicated by trauma or chronic illness
- Counseling and long-term effects monitoring may be helpful and is critical for pregnant victims.
- Psychological support helpful