| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
Radioactive neutron sources such as 252Cf and 241Am-Be(a,n) are used for various purposes. The neutron emission rate (neutrons per second) of the neutron source is very important for radiation protection and safety management. In the present study, we develop a new type of manganese bath for determination of neutron emission rate of a radioactive neutron source. The manganese bath has a multilayered structure composed of polyethylene plates and manganese alloy plates containing 70 % manganese. In measurements of neutron emission rate, a neutron source is set in the center of the manganese bath at first. 56Mn is produced by the 55Mn(n,g)56Mn reaction. The neutron emission rate is finally determined by measuring gamma rays emitted from 56Mn using a NaI(Tl) scintillation detector with a 5.08 cm diameter and a 5.08 cm length and a high purity Ge detector with relative efficiency of 60 %.
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