Abstract
From neutron-irradiated uranium cooled for about 2 days, 143Pr was separated indirectly by solvent extraction. After removing uranium and some extractable nuclides with bis(2-ethyl hexyl)orthophosphoric acid from 10 M nitric acid solution, 143Ce was extracted with bis(2-ethyl hexyl) orthophosphoric acid (n-heptane diluent) from a 10 M nitric acid solution containing potassium bromate. Then, 143Pr was purified after most of the 143Ce had decayed off. Detailed measurements indicated a half-life of 13.55 ¹0.02 days and maximum β-ray energy of 0.93¹0.05 MeV.
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