4.7
DOSE CALCULATIONS FOR USS PC-1546.
Dose calculations for PC-1546 on 1-2 March 1954, when BRAVO fallout was
encountered, are detailed below. Time periods below deck are indicated by an asterisk (*). After
2 March, the daily film badge dose is calculated by multiplying the contributions to exposure, both
topside and below (from table 3.7), by the appropriate time-averaged shielding factor or
apportionment factor. Contributions from each source are summed and converted to a film badge
dose. Cumulative film badge doses are given in table 4.7 and are carried out through 11 July
1954, when dose accrualfalls below 1 mrem per day.
Integrated Fallout
Day
Time Period
1 March
0000-0600*
0
0600-1200
Ship Shielding
Adjusted
Factor
Exposure
0.4
1.0
1200-1900*
189.7
0.1
1900-2100
171.4
1.0
2100-2400*
245.5
0.1
0.4
19.0
171.4
24.6
215.4
Intensity (mR)
Xx
607.0 (table 3.7)
1 Marchfallout dose
2 March
= (215.4 mR) (0.7 mrem/mR)
= 150.8 mrem (table 4.7)
0000-0800*
431.9
0.1
43.2
0800-1200
138.6
1.0
138.6
1200-1330*
42.2
0.1
4.2
1330-1700
75.4
1.0
75.4
1700-1800*
18.2
0.1
1.8
1800-2000
31.8
1.0
31.8
2000-2400*
57.9
0.1
_5.8
796.0 (table 3.7)
300.8
2 March fallout dose = (300.8 mR) (0.7 mrem/mR) = 210.6 mrem.
Dose from shine and ship contamination
8.6 mrem.
Cumulative film badge dose through 2 March = 370 mrem (table 4.7).
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