RMI Nuclear Justice Documents

Table 2.

Bravo Crater (Bikini) Sediment Exposures
Bulk*

Film
XXII

XXII

Activity

(pCi/g)

Degrader

~~ 120

none

v 120

.00025" Mylar

Blank

Exposure

(mm *)

Time (Hrs.)

Tracks/mm?

v~ 0.11

522

0.11

525

Net R**

Xx 10"

739/23

32.02

5.11

827/23

35.85

5.72

788/23

34.15

5.42

828/23

35.89

5.70

741/18

41.06

6.51

414%
~ 120

-0005" Mylar

v0.11

525

TO9

XXT

Sensitivity***

(+ %S)

+0.91

377/23

16.28

2.58

372/23

16.06

2.55

NOTES;
*xActivity estimated as 45 pCi/g 24]am, 71 pCi/g 239° 24%u and 4 pCi/g 238Ppu based on analyses of
adjacent samples (V. Noshkin, pers. comm.).
k*AR = tracks/mm?; S = standard deviation, expressed as % of R, calculated for the average R from
tracks/mm* values for individual square millimeters.

*kkTracks per mm“ per pCi/g per hour of exposure (x 10").