3.2.5 USS BELLE GROVEDose Calculations
Dose calculations for the BELLE GROVE on 1-2 March when BRAVOfallout 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
integrated intensity topside (Table 2-5) by the time-averaged shielding factor (0.46);
the integrated intensity below is multiplied by the fraction of the day spent below
deck (0.6). Contributions from each source are summed and converted to a film badge
dose. Cumulative film badge doses through 31 May 1954 are given in Table 3-5.
0000-0600*
0600-0830
0830-1030*
1030-1200
1200-1530*
1530-1700
1700-1800*
1800-2000
2000-2400*
x
Ship Shielding
Factor
0
0
0
0.5
39.6
68.5
108.9
411.0
647.1
1275.6 (Table 2-5)
1.0
0.1
1.0
0.1
1.0
0.1
=
Adjusted
Exposure (mR)
0
0
0
0.5
4.0
68.5
10.9
411.0
64.7
so
an
| March
Integrated
Intensity (mR)
Ww
Time Period
Ww
Day
{ March film badge dose = (559.6 mR) (0.7 mrem/mR) = 391.7 mrem (Table 3-5
2 March
0000-0800*
0800-1200
1200-1330*
1330-1700
1700-1800*
{800-2000
2000-2400*
516.7
218.9
75.0
168.0
37.7
49.2
0.1
1.0
0.1
1.0
0.1
1.0
80.0
1145.5 (Table 2-5)
0.1
51.7
218.9
7.5
168.0
3.8
49.2
2 Marchfilm badge dose = (507.1 mR) (0.7 mrem/mR) = 355.0 mrem
Cumulative film badge dose through 2 March = 747 mrem (Table 3-5)
126
8.0
507.1