42g
OFFICIAL USE ONLY
DRAFT
CRITERIA FOR ESTABLISHING SHORT TERM PERMISSIBLE
INGESTION OF FALLOUT MATERTAL
Gordon M. Dunning
Division of Biology and Medicine
Atomic Energy Commission
Washington, D. C.
The criteria for establishing permissible ingestion of radioactive
fallout material under emergency conditions for times immediately fol-
lowing a nuclear detonation wre dependent primarily on exposures to the,
gastrointestinal tract from the gross fission product
activity,
De
thyroid from the isotopes of iodine and,
89
bone, principally fram sr? y”, Sr”, Ba
I.
U0 _,to
Doses to the Gastrointestinal Tract
The following principal assumptions are used in calculating the doses
to the gastrointestinal tract of adults:
Be
The calculations are based on the methods contained in reference
ONE «
be
The fallout material is insoluble.
(See V. Discussion below)
Ce
The activity decays according to the principle of (time 72°? ,
Ge
The energy delivered is all derived fram the beta emissions,
having a mean energy of 0.5 Mev when in the lower large
intestine.
(See Graph Qne*)
Mee
of
ur
OFFICIAL USE ONLY
2) we
eC