Application of a sealed tube neutron generator to the characterization of very short half-life isomeric states

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Abstract

A SODERN sealed tube neutron generator producing 14 MeV neutrons has been used for detecting radionuclides with a half-life from about 20 μs to 1 s. An interesting feature of this kind of sealed tube neutron generator is the pulsed operation at adjustable pulse width from 5 μs to 10 ms or more, and at frequencies from continuous mode to 10 kHz. This capability allows the study of very short-lived isotopes down to a few microseconds with the cyclic activation method. A semiconductor γ ray detector Ge(HP) and ORTEC electronics were used for spectrometric measurements. The half-life measurement of short-lived activation products is performed with a fast multiscaler. Seven isomeric states have been successfully studied, characterized and their activation cross sections evaluated by the cyclic activation method: 114In, 181Ta, 181W, 205Pb, 206Pb, 207Pb, and 208Bi.

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1

This work is performed in the framework of a PhD to be presented at the Centre de Physique Atomique, Université Paul Sabatier, Toulouse, France.

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