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 RnL06, during this
time are mgligible.
Since fission product samples contain many nuclides contributing to the total beta activity of the sample, each of which has its
own erergy 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
Station andCollection
Days After
Range
Time Interval
T
1
1
1
How
How
How
How
? =i hr
¢7 ihr
-lhr
$1
9
50
73
102
"780
1270
1180
1180
Le?
24
204
204
1
1
1
1
1
1
1
3
How
How.
Nan
Nan
Nan
Nan
Nan
Uncle
2- 2hr
2 - 24 hr
1-14 hr
1-14 hr
1-14 9
l-lr
1-1¢ hr
0-4 hr
15
25
9
15
25
73
101
4
820
1080
780
840
1040
1120
1200
940
1.8
202
1.7
1.8
22
203
205
20
1
4
3238
How
How
Shot
2 <- 2h hr
(mg/em?)
Ener
Shot
9
$-l1hr
16
780
+
800
(Mew)
1.7
1.7
GAMMA ENERGY SPECTRUM
The gamma energy and decay spectrum of a ground sample picked up
at George after Shot 4 was investigated with a scintillation spectrometer. Individual isotopes were identified where possible and their
activities corrected back to the time of detonation.
Work similar to that done here has been carried out for previous
operations by Bouquet 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 radioactivity, a quantitative measure of the amount of the nuclide of gamma
ray present in any sample can be madee
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 subtractede
This subtraction exposed the next mst
energetic photopeak to the same treatment and the cycle was repeated.
75