Cumulative yields of tin and antimony nuclides from thermal-neutron fission of 235U

Transfer and Exchange of Trivalent Chromium in Solids

“…In previous work [1] the cumulative fission yield of 129 Sb was measured radiochemically for thermal neutron induced fission of 236 U and a value of 0.39% was obtained. It was compared with other values reported earlier; these were 0.4% [2], 0.2% [3] and 1.12% [4], More recently, ERDAL et al [5] reported 0.62% for this cumulative yield, a value which is not in accord with any of those given above. In the last mentioned account it was suggested that the discrepancy, at least for the low values, may arise in connection with endwindow counter calibrations ; a partial loss could result from the evaporation of hydrochloric acid solutions during the preparation of deposits of radioactive antimony for 4 π ß-i&y counting.…”

“…The detection of the Cr0 4~ ion radical by electron spin resonance techniques [4] is not in contradiction with this mechanism. On heating however, the corresponding ESR signals already disappear at a temperature of 60 to 80 °C [5], The Cr0 4~ center can thus not be regarded as responsible for any interaction above 100 °C. In order to verify the suggested reaction, potassium Chromate crystals have been doped by means of macroscopic quantities of labelled trivalent chromium, which can be detected and evaluated by a classical analytical procedure.…”

“…The 129 Sb was isolated in the presence of a minute amount of isotopie carrier as Sb 2 S 3 which, following ERDAL et al [5], was dissolved in aqueous ammonia instead of, as previously [1], dilute hydrochloric acid. This ammoniacal solution was standardized using the 4 π ß-i&y proportional counter to determine the activity absolutely and it was also used with more isotopie carrier to prepare Sb 2 S 3 sources of known specific activity for counting under the end-window proportional counter [I].…”

Relative Yields of Stable Tellurium Isotopes in Neutron-induced Fission

“…However, if the cadmium and tin data are normalized to recommended yields for masses 116 and 117, based on radiometric yields at masses 115, 121, 123 and 125, there is a considerable mismatch between the palladium and cadmium data. If the tellurium yields are normalized to the radiometric measurements at mass 125, there is good agreement with the radiometric yield at mass 127 of 0'124±0'015% (Erdal et al 1969) and a smooth transition from the tin to tellurium fission yields.…”