| Project/Area Number |
24740136
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | 半減期測定 / 壊変定数 / 化学効果 / テクネチウム / クロム |
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| Research Abstract |
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.
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