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 '