UNIQUE DOCUMENT ee
6
&
7
nt
r bt
e
cola
r
are
oS
bs
U. S. NAVAL RADIOLOGICAL DEFENSE LABORATORY "°xTLY "rE"
SAN FRANCISCO 24, CALIFORNIA
3~901-258
410830
Goluiss
Dr. Gordon M, Dunning, Health Physicist
15 WAR 1s--
,Biophysies Branch
=p,
Division of Biology and Medicine
Atomic Energy Commission
Washington 25, D. C.
Dear Dr. Dunning:
i
}
This is a very 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:
“i
A”
ae
<
a
wat
ul.
oO
a}
.
a. It was not our intent to criticize the actual value ef
100 to 1 beta-gamma ratio which appeared in your paper. We were merely
DEPARTMENT OF,
a
BEST COPYAVAILABLE
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 ami 24.
b. As far as the variation of the beta-gamma ratio with time
| is eoncerned, I would suggest that you refer to a paper by Mr. C.
Sonihaus 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.
c. The deviations from the t7!°* decay law have been obtained
in field operations - See, for example, Project 2.6a: Operation CASTLE
Final Report, Wr-917.
U)
d. We have not seen any definitive results on the amount of
non-fission product activities for the CASTLE Bravo type contaminant.
&
Wy
‘e. The experimental work on the penetration of radioactive
particles into clothing has not been done at this Laboratory. We would
12) 7/2Y
appreciate any reference you might give us on this subject.
Date:
Declassified by DNA, Chie
Ww
2. As was also in my letter of August 23rd, the above comments were priwarily formujated by Drs. J. D. Teresi and A. Breido.
Th.s do ment consists of
pages.
tr142 opy / of 2 —
.
62.46
Sincerely yours,
ga /__—ont
.
_ Associate Scientific Director
Col UohsHAMAMEE! 2 - 2
buy 7
TERENTETepe
TR
“
&