Characteristics of radionuclide intake by inhalation

Internal exposure of all organs other than bone tissue by inhalation of a mixture of radionuclides virtually ceased by the end of the first year after the accident. Comparatively intensive fallout from the radioactive plume took place in the town of Pripyat' late in the evening and during the night of 26-27 April 1986. The density of contamination in certain streets of the town by iodine-131 at the time evacuation began was estimated to be of the order of (1-70)x106 Bq/m2 (30-2000 μCi/m2). This gives a value of intake by inhalation of (0.3-20)x106 Bq (10-700 μCi), which corresponds to an absorbed dose to the thyroid gland in adults of 0.2-14 Gy (20-1400 rad). The actual results of measurements were significantly lower than the maximum estimate. The main contribution to the predicted 50-year dose equivalent commitment for bone tissue is from transuranium elements, and exposure during the first year corresponds to about 1/4 of the maximum permissible dose for occupationally exposed persons. (author). 3 figs, 6 tabs.

Authors

Khrushch, V.T.; Gavrilin, Yu.I.; Konstantinov, Yu.O.; Kochetkov, O.A.; Margulis, U.Ya.; Popov, V.I.; Repin, V.S.; Chumak, V.V.

Descriptors

air; chernobylsk-4 reactor; dose commitments; excretion; fallout; inhalation; iodine 131; radiation accidents; radiation doses; accidents; beta decay radioisotopes; beta-minus decay radioisotopes; clearance; contamination; days living radioisotopes; enriched uranium reactors; fluids; gases; graphite moderated reactors; intake; intermediate mass nuclei; iodine isotopes; isotopes; lwgr type reactors; nuclei; odd-even nuclei; power reactors; radioisotopes; reactors; thermal reactors

Subject Category

Actual Accidents

Source

Report; International Atomic Energy Agency, Vienna (Austria); Medical aspects of the Chernobyl accident; IAEA-TECDOC--516.; Jul 1988.; 381 p.; p. 117-132.

Place of Publication

International Atomic Energy Agency (IAEA)

Availability

Available from INIS in electronic form.