CALCULATIONS OF DOSE to TAKUYO MARU Personnel
Japanese data:
-
4
2000 hours JST
4 July
Rainout started
2.
2030 hours JST
14 July
Rainout over
36
2200 hours JST
4 July
Highest count of 37470 cpm
he
0530 hours JST
15 July
Start of decontamination
De
Scintillation background = 2400 cpm
66
Contamination of scintillation counterprobe was 11,235 cpm
Te
Conversion:
500 cpm = 0.7 mr/wk
Other data:
1.
1230 hours JST
260
I= ut
36
Dose =
Where:
“
12 July
Jj
rT ln i-n|
t,
= time of entry
to
= time of exit
mr Lh
"
F.
Detonation time
2
intensity at H + 1 hour
Assumptions:
1.
The suspected event to have taken place at 1230 hours JST, 12 July.
NOTE:
The only instance where we are able to attempt an estimate
of the decay rate from the Japanese data is compatible with
the assumed time of detonation of the suspected event.
n= 2.2
3e
Continuous exposure of personnel to indicated dose rate for
the time period used.
he
Use 2030 hours 14 July for time of highest count:
H + 55 hours =
5e
Use 1130 hours 15 July for end of decontamination:
H + 70 hours =
6.6
ty
t2
Use 0030 hours 27 July as time of monitoring TAKUYO: ©
125 days = H + 300 hours = to
28
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