Abstract:
To precisely measure the decay parameters of
142La, the prepared
142La sample must have high activity, high abundance and be free from carrier. A separation procedure with three steps was proposed to prepare the sample from fission products. In order to receive optimal results, the decay relationship of mother-daughter nuclides in the 142 mass chain and the differences of their independent fission yields need to be taken into account. The established three-step chemical procedure involves one BaCl
2•2H
2O precipitation and two HDEHP extraction chromatographic separations. A specialized set of equipment was created and used to fast radiochemically separate the
142La in batches. As a result, the total separation lasts about 20 min, and the chemical recovery rate is about 80%. The decontamination factors for other nuclides are greater than 10
3, and the activity ratio of
142La to
141La is more than 3.5.
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