R. Guin

The anion exchange behavior of Te and Sb

The absorption behavior of Te and Sb in different oxidation states by anion exchange resins in hydrochloric acid medium has been studied. Distribution coefficients for Te(IV), Te(VI) as a function of HCl acid concentration (upto 3M HCl) have been determined. The absorbability for Sb(III) was noticed to be very high and could not be eluted out of the column using HCl as eluent. Sb(V) could be eluted quantitatively using 3M HCl. The present study clearly indicate that due to the EC/β+ decay of the parent isotopes117,118Te, the daughter nuclei117,118Sb are produced predominantly as Sb(III).

Isomer ratios of86,87Y and84Rb in the alpha induced reaction on85Rb

Isomer ratios for87Y,86Y and84Rb from α-induced reactions on85Rb in the energy range between 20 and 60 MeV have been measured. The data show a characteristic increase followed by a decrease with the increase in bombarding energy. The fall in the isomer ratio values are explained on the basis of enhanced angular momentum depletion by the precompound particles and thereby leaving the compound system at low angular momentum states. A different reaction mechanism has been proposed for the low yield of the high spin isomer in the /α, αn/ reaction in85Rb.

Cation exchange separation of trace amounts of 203Hg and 181Hf

A radiochemical method of separation of 203Hg from 181Hf is described. The method involves separation by Dowex 50W- X 8, 100-200 mesh, cation exchange resin using 1 M hydrochloric acid as the eluant. The chemical yield for the separation of mercury is > 85% and the decontamination factor is > 10(4). The 181Hf can be eluted from the column by 4 M HCl.

The decay of104mAg

The decay of 33 min 2+ isomeric state of104Ag has been studied.104Ag has been produced following the103Rh(α, 3n) and107Ag(α, α 3n) reactions using 29 and 55 MeV α-particles, respectively. The present results indicate that104mAg decays mainly by EC/β+ decay. The IT branch for this decay was found to be <0.07% as against the reported value of 33±5%.