respectively.)
The increasing contribution of Pri44 is reflected in
the increase of the maximum energies shown in the tables.
Contributions of higher erergy isotopes, such as Rhi06, during this
time are megligible.
Since fission product samples contain many nuclides contributing to the total beta activity of the sample, each of which has its
own ensrgy spectrum associated with it, no conclusions should be
drawn from these data as to the average beta energies of these samples.
TABLE 3.9 ~ Beta Range Measurements
Shot
Station and Collection
Time Interval
“T
How
1
How
1
1
1
1
1
1
1
1
1
1
3
4
323
How
How
How
How
How
Nan
Nan
Nan
Nan
Nan
Uncle
How
|Days After
Shot
¢ - ihr
Range
(mg/em@)
9g
27 1 hr
4. 1hr
$-l1hr
2 - 24 hr
2- 28 hr
1-14hr
1-14 hr
1-1 br
l1-ier
1-1 hr
0-3 hr
1.7
780
1.7
1080
780
840
1040
1120
1200
940
242
1.7
1.3
202
2.3
2.5
2.0
1170
1180
1180
15
820
25
9
15
25
73
102
14
4-1 hr
780
50
73
102
9
2- 28 hr
16
|
"Ener
(Mev
B00
24
204
24
1.8
1.7
GAMMA ENERGY SPECTRUM
The gamma erergy and decay spectrum of a ground sample picked up
at George after Shot 4 was investigated with a scintillation spectro~
meter.
Individual isotopes were identified where possible and their
activities corrected back to the time of detonatione
Work similar to that dom here has been carried out for previous
operations by Bouguet et al. 16/ The method assigned the most energetic
photopeak to a specific nuclide or gamma ray for which a standard
spectrum was available or could be estimated. Since the area under
the vhotopeak is directly proportional to the intensity of the radio~
activity, a quantitative measure of the amount of the ruclide of gamma
ray present in any sample can be made. By normalizing the standard
spectrum of the assigned nuclide or gamma ray to the intensity ob-
served in the fallout sample, its contribution to the total sample
spectrum was subtracted. This subtraction exposed the next mst
energetic photopeak to the same treatment and the cycle was repeated.
75