Variation measurements of decay constants of Tc-99m as a chemical tracer

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The decay constants of some nuclides which decay via the internal conversion and electron capture process are changed with changing environmental factors such as its chemical states. Examples of this type of nuclides are metastable state of Tc-99 (Tc-99m) and Cr-51. There is a possibility that the variation measurement of the decay constants with radiation detection is able to use as a chemical tracer.In this study, an apparatus for precise measurement of the decay constants was developed at first. The decay constants of these nuclides were precisely measured with various chemical states to investigate the effects of chemical states on the decay constants of nuclides. In the case of Cr-51, the relative differences of the decay constant between chemical states of Cr-51 were compared with a simple theoretical model.