APPENDIX IH.
GEOMETRY CALCULATION
Let
£
t
Bs
counting rate on Pd - Ag backing _ 1 ooret- 18
=
counting rate on weightless backing
_
counting rate of PbO> sample
SA ~ counting rate of weightless sample
. In2
Br 35
cm”
= 1.09
.
absorption coefficient of B radiation of Ra E
t = mg/cm air gap + counter window + absorber
A = measured counting rate
disintegration rate of sample
geometry, g
=
APPENDIX IV.
A.
A» elt
fai fsa’ D
FISSION CALCULATION FROM ELECTROSCOPE DATA
Calibration of Electroscope
-The activity of the Ra D+E standard is measured on the electroscope
in units of divisions per minute, Z.
geometry,
y
G .
Zz - elt ai
f,-f
B
SA’
min |
dueintegrations
Where symbols are the same as for the beta proportional counter and the
factors have the same values.
The response of the electroscope to Mo??
is approximately the same as for Ra (D+tE), since the beta energies are
approximately the same.
B.
Calculation of Fissions
This caiculation is the same as for the beta proportional counter
where R, is in divisions per minute and g is replaced by G.
le B. P. Burtt, Nucleonics 5, No, 2, 28 (1949).
an
- 57 4
b
3
'