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THE SHORTER-TERM BIOLOGICAL HAZARDS OF A FALLOUT FIELD
;
INTERNAL DOSE FROM SHORT-LIVED RADIONUCLIDES
Tague I.—MAXIMUM PERMISSIBLED OCCUPATIONAL EXPOSURE—Continued
Single Exposure Values for Ingestion of Radionuclides
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8
(SI)
5 Tha in column2 indicates daughter products that are isomers in an excited state.
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‘UWLI—uppor large intestine, LLI—lower large intestine,
The letters given in parentheses Indlente the erftical body organ.
assime that the risk of damage from contaminated wounds is relatively unimportant,
Ip most. cases the inhalation of insoluble radio-
swallowed (62 percent for inhalation and 100
percent for ingestion) and that it irradiates
various portions of the G.I, tract in direct
ble values than inhalation of soluble radioactive material. Usually the lowerlarge intestine is the mostcritical portion of the G1. tract
except where radionuclides of very short radio-
Some of the radioactive material passes through
the wall of the small intestine determining a
biological half-life. In case daughter products
are produced, their contribution to the absorbed
In the cases where the G.I. tractis the critical
organ (column 7 of Table I and columns 4 and
6 of Table I), it is assumed the material is
Figure } indicates the absorbed dose distribution in the G.I. tract for three cases, Sr”+ Yr.
Ra™-+ Ac” and Pr. In the case of Sr®+- Y"
active half-life are considered or where fez 1.
proportion to the time spent in each section,
dose is included.
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Pr
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Nore.--The0.4 or 150 in parentheses refers to the limiting dose rates of0.3 rem/wk or 150 rern/70 yrs-~whicheverglves the smaller maximut permis-
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TIME IN THE GI TRACT (Hours)
Fraure 1.—Time in the GI tract (hours).
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