GAMMA-RAY SPECTRA OF THE PRODUCTS OF FAST NEUTRON FISSION OF U235 AND U238 AT SELECTED TIMES AFTER FISSION
NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CA
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Experimental measurements of the gamma-ray pulse height distributions due to the products of fast-neutron-induced fission of U235 and U238 are presented. The measurements were made at nine selected times after fission from 15 minutes to 3 days. Irradiation times and counting intervals were chosen to minimize saturation and decay effects. The experimental data were used to calculate 100 energy bin distributions of the absolute number of photons fission-sec. by means of absolute calibrations of the collimated NaIT1 detector. The number of fissions in each sample was determined radiochemically. Machine computation was used extensively.
- Radioactivity, Radioactive Wastes and Fission Products