Methodological principles for calculating levels of external and internal exposure of the population used in taking strategic decisions

The significance of each of the factors involved in internal and external exposure of the population can vary considerably as a function of the specific exposure conditions or the time which has elapsed since the accident. If data on the radionuclide composition of the fallout are available, dose rate dynamics can be calculated in accordance with the law of radioactive decay for the mixture of interest. After four years the reduction in the dose rate follows the law of caesium-137 decay in soil, and the effective period of removal of half the radioactivity from the body is Teff1/2 = 14 years (Biophysics Institute of the USSR Ministry of Health) (according to other data 7 or 5 years). In the first year after the accident, the effective dose equivalent to the human body was determined by strontium-90 and strontium-89. The EDE (Effective Dose Equivalent) for subsequent years and the integrated 50-year EDE will be governed almost completely by strontium-90. (author). 2 tabs.


Barkhudarov, R.M.; Gordeev, K.I.; Dibobes, I.K. (and others).


biological half-life; body burden; cesium 137; chernobylsk-4 reactor; contamination; dose commitments; dose rates; external irradiation; food; internal irradiation; man; radiation accidents; radiation doses; radionuclide kinetics; soils; strontium 89; accidents; animals; beta decay radioisotopes; beta-minus decay radioisotopes; cesium isotopes; days living radioisotopes; enriched uranium reactors; even-even nuclei; even-odd nuclei; graphite moderated reactors; intermediate mass nuclei; irradiation; isotopes; kinetics; lwgr type reactors; mammals; nuclei; odd-even nuclei; power reactors; primates; radioisotopes; reactors; strontium isotopes; thermal reactors; vertebrates; water cooled reactors

Subject Category

Actual Accidents


Report; International Atomic Energy Agency, Vienna (Austria); Medical aspects of the Chernobyl accident; IAEA-TECDOC--516.; Jul 1988.; 381 p.; p. 171-182.

Place of Publication

International Atomic Energy Agency (IAEA)


Available from INIS in electronic form.