INDC(IND)-35G - IAEA Nuclear Data Services

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Cumulative yielda of short-lived ruthenium iaotopea in the tbanial neutron
induced fisaion of 233 U, ®% and 239 Pu.
A.O.C. Hair, Alolt Srivaatava, A. Goawami and B.K. Srivastava
Cumulative yielda of 107 Ru, 108 Ru and 109 Bu in the fission of S3A U, 256 D and
Fu have teen determined using fast radioohemloal separation teohniquea
followed by high resolution ^-ray speotrometry. The fissile material a ( 1OyUg)
«ere irradiated in pneumatio oarrier faoility of CIRUS reaotox for 20 seo. The
ruthenium isotopes were aepaxated from the irradiated target by distilling
rathenitw as RuO. froa fission products in presence of NaBiO- and was oollected
in ice cooled 1M HC1. Using this method a chemioal yield of 50^ and high de-
contamination (>1000) fxoa teohnetiUB and halogens were obtained. Cunulatire
yields of ^Eu, Ra and Ru were oaloulated from the experimentally obtained
count rates whioh are corrected fox detection efficiency and -ray atandancea,
using standard equations, further, these yields were converted into ohain yialda
assuming normal charge distribution systematic a for comparison with the literature
data on ohain yielda. The following table give a the values of cumulative yields
and ohain yields.
TAHfi 1
Cumulative Yialda of Ruthenium Isotopes lotope in the
thermal neutron induoed fission of 253u, 233n. 235tf and
Haas 233 U(y0 235 U(?S) "**&) Reference
107 0.111+0.012 0.145 ±0.032 3.068 ± 0.264 This work
0.13 ±0.01*
1OS 0.077 ± 0.005 0.067 ± 0.017 2.005 ± 0.165 This work
0.042 ± 0.002* 1.89 ± 0.05*
109 - 0.034 ±0.004 1.088 + 0.98 Thia work
0.027 ±0.003*
* P. Pettwela, P. Sal Marmol, Z. Physik A. Z&, 359 (1975)<
© J.K. Dickens, J.V. Mo Connell, K.J. Horthout, Kiol. Soi. Bngg. 21* 146 (1981).