Chapter 4
DOSIMETRY
4.1
INSTRUMENTATION
At 1480 on 1 Marchfirst indication of radioactive fallout was detected on a TN3A
meter (24-hour, continuous recording meter). Meter located at Radio-Sound Section.
Read 0.9 ma at 1450.
4.2
FILM BADGES
Fourteen film badges were received at Eniwetak on 19 February. Eight were
placed in a reefer in the mess hall. The remaining six were distributed as follows:
One to Army group. Assigned to Sieber. Was positioned 7 feet above floor of tent
on tent pole. Reading: 6 \roentgens.
Two
assigned to Radio— Weather Station. One worn by Cagle, the other by Neil.
Reading: $8 roentgens.
One assigned to Curbow (in housing area). Reading:
oentgens.
One assigned to Pletsch. Worn on left shoulder pocket. Reading:
roentgens.
One placed on side of building in housing area. Located shoulderand moved
east-west to avoid direct sunlight. Reading: #4 froentgens.
The above film badge readings were given the men while they were at Eniwetak
(source unknown).
Dispatch No. 240 431A from CTG 7.1, Eniwetok and COMNAVSTA, Kwajalein, re-
ceived 25 April, reads:
“ Film badge readings areagfollows:
Andrews, Billie F.
40r F
Neil, Wallace R.
Baker, Donald L.
Pletech, Ronal E.
Azbill, Lawrence L.
Noley, Lamont R.
Cagle, Oris
Pierson,
Cooper, Edward H.
La Magna, Gerald R.
Curbow, Geno
Sieber, Donald A.
Mooney, William J.
Thornton, William E.
2
Film badges presently in
dy of TU 7, TG 7.1 until completion 6T operation, at
which time they will be forwarded to AFSWP.’’
The dispatch contains the distribution list for the film badges as originally proposed.
However, as previously stated, only six of these badges were actually distributed (see
preceding paragraphs for distribution). It is further noted that the film badge readings
of the dispatch differ somewhat from the readings reported by the men who wore or were
responsible for them.
The final estimated values of the exposure for the Rongerik Group are corrected for
shielding from buildings and differ from the film badge readings and the doses calculated
from the dose rate and decay curves, as discussed in Chapter 1 of the final report of
Project 4.1.
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