UNIQUE DOCUMENT #55
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U. S. NAVAL RADIOLOGICAL DEFENSE LABORATORY toris:
SAN FRANCISCO 24, CALIFORNIA
3~901-258
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15 MAR is--
Dr. Gordon M. Dunning, Health Physicist
Biophysics Branch
Division of Biology and Medicines
Atomic Energy Commission
Washington 25, D. C.
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This is a wery late response indeed to a letter that you
wrote on September 9, 1955, asking for comments on the points you
discussed relative to my letter of August 23rd in connection with
the beta-gamma problem. On the assumption that a response may still
of some historical interest, I should like to mention the following:
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Dear Dr. Dunning:
DEPARTMENT Of
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218
a. It was not our intent to criticise the actual value ef
100 to 1 beta-gamma ratio which appeared in your paper. We were merely
|{ attempting to point out that there might be some ramifications which
needed explanation or discussion, and for this we suggested reference
material such as USNRDL Technical Memoranda 218 and 24.
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b. As far as the variation of the beta-gamma retio with time
23 23% is eoncerned, I would suggest that you refer to a paper by Mr. C.
Sonibaus of this Laboratory, namely, USNRDL-394(1952). This paper
rresents (for fission products) a plot of a calculated beta-gamma
ratio versus time and also on the same graph shows effective gamma
and beta energy curve as a function of time.
ce.
The deviations from the g7t-2 decay law have been obtained
in field operations - See, for example, Project 2.6a: Operation CASTLE
ISTS
Fiml Report, Wr-917.
non-fission product activities for the CASTLE Bravo type contaminant.
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e. The experimental work on the penetration of radioactive
particles into clothing has not been done at this Laboratory. We would
appreciate any reference you might give us on this subject.
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We have not seen any definitive results on the amount of
As was also in my letter of August 23rd, the above comments were pri-
marily formujated by Drs. J. D. Teresi and A. Breido.
“th s do ment consists of
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Sincerely yours,
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EUGENE
Associate Scientific Director
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