CHAPTER Ill, SECTION 5
(Neg. No. W-W-401-1)
Figure No. 3-11.
Donning Protective Clothing at Rad-safety
Check Point — Yvonne.
in Radex areas. It was found that in some
underwater areas the radiation intensities were
in excess of 50 roentgens per hour. Rad-safety
divers were instrumental in detecting and re-
covering a radioactive source which had been
dropped from a barge into 85 feet of water.
H&N Rad-safety personnel assisted TU-6,
TG 7.1, in the issuance, collection, and process-
ing of film badges. Daily rosters were compiled
of all H&N personnel who had accumulated
dosages in excess of 2000 mr. After the first
13-week period of the operation, a daily roster
was issued covering all personnel whose accumulated dosages were in excess of 4000 mr.
Contributing significantly to the dosage of
all personnel at Eniwetok Atoll was the fall-out
that resulted from the KOA event in early May
1958. This fall-out contributed up to 1500 mr
to those persons who remained at Eniwetok
Atoll for the duration of the Operation. It became necessary, therefore, to request that the
limitation of 3750 mr dose per 13-week period
be increased and the 5000-mrdose for the Opera-
tion be increased to 10,000 mr for 35 H&N employees. These were personnel whose work was
of such a nature that their absence would
have seriously handicapped the accomplishment
of the Operation. As of 20 July 1958, only 4 of
the 35 employees had exceeded the 3750 mr
guide, and none had exceeded the 5000 mr limit.
Page 370
Following is a summary of the dosages received by TG 7.5 personnel as of 20 July 1958:
DOSE IN MR’
NUMBER OF
PERSONS
0
674
19.5
PERCENT
1 to
500
521
15.1
500 to
999
362
10.5
1000 to 1999
1352
39.3
2000 to 2999
432
12.6
3000 to 3750
81
2.4
3751 to 5000
19
0.6 —
Over 5000
0
0.0
Total
3441
100.0
The Fs-3 Film Evaluation System, built by
Eberline Instrument Company, was used for
processing the film and interpreting the optical
density to mr dosage. Film used was a 2-film
packet containing Dupont Type 502 and Du-
pont Type 834 films. Film packets were dipped
in ceresin wax prior to sealing in vinyl plastic
cases.
On 1 April 1958 all TG 7.5 personnel were
issued operational film badges. All initial issue