International Atomic Energy Agency (IAEA)
Emergency Worker Turn-back Dose Guidance 1
1 This dose guidance is set at levels that will allow completion of tasks and return to base without exceeding international guidance levels. Emergency worker dose level guidance values are expressed as an integrated external dose and it is assumed that all necessary precautions are taken to prevent internal exposure. The guidance is applicable for the entire time of the emergency.
2 Workers shall be volunteers and be provided with information on the potential health consequences of exposure to allow them to make an informed decision. For example: 3000 mSv exposure could be life-threatening, 500-1000 mSv can result in short-term vomiting, reduction in sperm count, and an increase in the chance (risk) of development of cancer from the normal rate of about 25% to about 30%. Exposure to a dose of 100 mSv will not result in any short-term effects, but will result in a small increase (about 0.5%) for the risk of development of fatal cancer.
4 In principle, there are no recommended dose restrictions for rescuers performing lifesaving activities. However, this applies if, and ONLY IF, the benefit to others clearly is more important than the rescuer's own risk.Adapted from Manual for First Responders to a Radiological Emergency (PDF - 2.2 MB) (CTIF, IAEA, PAHO, WHO, October 2006, page 41)