RADIOCHEMICAL FRACTIONATION CHARACTERISTICS
11:
tioned represent the predominant peaks in the spectra obtained. Figure
2 indicates a typical gamma-spectrometer scan observed over a twoyear-period. The background radiation is the lowest line. The peaks o
interest are singled out on the figure.
RADIOCHEMICAL STUDIES
Calculations of the counting-rate yield at zero time for a particle
representing 10° fissions indicated that measurable activities would be
obtained for the nuclides of interest if nofractionation is assumed (see
Table 1). However, fractionation effects in single particles caused wide
Table 1— THEORETICAL RADIOCHEMICAL SENSITIVITY
FOR A PARTICLE OF 108 FISSIONS
(Basis: Counting Rate at Zero Time for 100% Chemical Yield)
Nuclide
Counts/min
83Sr
30Sr
O7r
2r
23
0.1
10
1000
IMO
562
Ml ag
hog
13Ru
ICs
M0Ra
i1ce
1440 @
Sly
U6ry
0.2
0.05
Zero abs, R=1
R=
0.09
R=
94
24
7.4
25
0.06
40
0.004
44
200
8%Cu
0.06
203 Ph
21Th
0.015
900
a3Tyy
239Nip
2407]
238py
239 Py/Jt
0.23
690
2880
2880
0.00005
*N = atoms, f = fissions.
R=1
R=1
R=1
MTN
TBe
24Na
Cu
187W
R=1
R=1
R=1
110 abs, R=1
0.5
2
2
10 Ry
136Cs
Remarks
0.0009
Zero abs, R= 1
R=
Zero abs, R=1
zero abs, R= 1
R=1
74 abs, R=1
R=1
N/f* = 100 x 1075
N/f = 100 x 1075
N/f = 1000 x 107°
N/f = 1x 1075
N/f=1x 107%
N/f=1x 1075
N/f = 100 x 1073
N/f = 0.3
N/f = 0.3
N/f= 0.1
N/f = 10 x 1075
N/f = 0.5
tJ = [atoms 738Pu/atoms *4°Pu/(atoms *8Pu/atoms *4°Pu) + 3.7).