IV-1. Table IV-1 gives generic criteria for acute doses for which protective actions and other response actions are expected to be undertaken under any circumstances to avoid or to minimize severe deterministic effects.
IV-2. Table IV-2 gives guidance values for restricting exposure of emergency workers.
TABLE IV-1. GENERIC CRITERIA FOR ACUTE DOSES FOR WHICH PROTECTIVE ACTIONS AND OTHER RESPONSE ACTIONS ARE EXPECTED TO BE UNDERTAKEN UNDER ANY CIRCUMSTANCES TO AVOID OR TO MINIMIZE SEVERE DETERMINISTIC EFFECTS External acute exposure (< 10 hours) If the dose is projected:
− Take precautionary urgent protective actions marrow, lung, small intestine, gonads, thyroid) and to the lens of the eye from exposure in a uniform field of strongly penetrating radiation.
b Dose delivered to 100 cm2 at a depth of 0.5 cm under the body surface in tissue due to close contact with a radioactive source (e.g. source carried in the hand or pocket).
c The dose is to the 100 cm2 dermis (skin structures at a depth of 40 mg/cm2 (or 0.4 mm) below the surface).
d AD(∆) is the RBE weighted absorbed dose delivered over the period of time ∆ by the intake (I05) that will result in a severe deterministic effect in 5% of exposed individuals.
e Different criteria are used to take account of the significant difference in the radionuclide specific intake threshold values for the radionuclides in these groups.
f The generic criterion for decorporation is based on the projected dose without decorporation. Decorporation is the biological processes, facilitated by a chemical or biological agent, by which incorporated radionuclides are removed from the human body.
g For the purposes of these generic criteria ‘lung’ means the alveolar-interstitial region of the respiratory tract.
h For this particular case, ∆′ means the period of in utero development.
TABLE IV-2. GUIDANCE VALUES FOR RESTRICTING EXPOSURE OF EMERGENCY WORKERS
Tasks Guidance valuea
Life saving actions
HP(10)b < 500 mSv
This value may be exceeded under circumstances in which the expected benefits to others clearly outweigh the emergency worker’s own health risks, and the emergency worker volunteers to take the action and understands and accepts this health risk Actions to prevent severe deterministic effects
and
actions to prevent the development of catastrophic conditions that could significantly affect people and the environment
HP(10) < 500 mSv
Actions to avert a large collective dose HP(10) < 100 mSv
a These values apply only for the dose from exposure to external penetrating radiation. Doses from exposure to non-penetrating external radiation and from intake or skin contamination need to be prevented by all possible means. If this is not feasible, the effective dose and the equivalent dose to an organ that are received have to be limited to minimize the health risk to the individual in line with the risk associated with the guidance values given here.
b HP(10) is the personal dose equivalent HP(d) where d = 10 mm.
References are to editions that are current as of the time of publication of these Standards. Editions that supersede these may be adopted under national legislation. In the event that the publications
referenced here are superseded, please refer to the most recent editions.
See also: http://www-ns.iaea.org/standards/
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GENERIC CRITERIA FOR PROTECTIVE ACTIONS AND OTHER RESPONSE ACTIONS