发明名称 |
PROPORTIONAL COUNTER TUBE |
摘要 |
PROBLEM TO BE SOLVED: To provide a proportional counter tube 11 with the lower measurement limit lowered of an element wanted to measure by improving the occurrence of tail distribution in pulse-height distribution made by radiation for excitation. SOLUTION: A gas 13 to be sealed up inside an envelope 12 contains 30 to 90% of helium in terms of a pressure ratio. Containing 30% or more helium in terms of a pressure ratio reduces detection sensitivity on radiation for excitation while lowering tail distribution in pulse-height distribution made by the radiation for excitation. Helium of 90% or less in terms of a pressure ratio maintains detection sensitivity on radiation of an element to be measured. COPYRIGHT: (C)2008,JPO&INPIT
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申请公布号 |
JP2008164344(A) |
申请公布日期 |
2008.07.17 |
申请号 |
JP20060351821 |
申请日期 |
2006.12.27 |
申请人 |
TOSHIBA CORP;TOSHIBA ELECTRON TUBES & DEVICES CO LTD |
发明人 |
HIKITA NORIYUKI;ISHIZAWA KAZUYA |
分类号 |
G01T1/18;H01J47/06 |
主分类号 |
G01T1/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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