| Project/Area Number |
05558066
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear fusion studies
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| Research Institution | TOYAMA UNIVERSITY |
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Principal Investigator |
MATSUYAMA Masao TOYAMA UNIVERSITY,HYDROGEN ISOTOPE RES.CENTER,ASSOC.PROF., 水素同位体機能研究センター, 助教授 (90135004)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Hiroo ALOKA CO.LTD., RESEARCH INSTITUTE,MANAGER, 研究所, 部長
ASHIDA Kan TOYAMA UNIVERSITY,HYDROGEN ISOTOPE RES.CENTER,RES.ASSISTANT, 水素同位体機能研究センター, 助手 (70192953)
WATANABE Kuniaki TOYAMA UNIVERSITY,HYDROGEN ISOTOPE RES.CENTER,PROF., 水素同位体機能研究センター, 教授 (50001326)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 1994: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1993: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | TRITIUM / FUEL CYCLE OF THERMONUCLEAR FUSION / BREMSSTRAHLUNG COUNTING METHOD / IN-SITU MEASUREMENT / NON-DESTRUCTIVE MEASUREMENT / BERYLLIUM WINDOW / MULTIPLE MATERIAL / FLOW CONTROL SYSTEM |
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| Research Abstract |
For tritium process in thermonuclear fusion reactors as well as a heavy water type reactor and the nuclear fuel reprocessing, it is indispensable to control the flow rate/passage of tritium according to the concentration of tritium. Especially, for the process of high level tritium, the development of precise control system for tritium is of a great importance from viewing point of safety. The applicability of a bremsstrahlung counting method to the insitu measurement of high level tritium has been examined so far. Since the penetration range of bremsstrahlung X-rays is remarkably greater than that of beta-rays, it is possible to measure directly the amount of tritium in a container attached with an appropriate window by the bremsstrahlung counting method. This method, therefore, will be a promising one to control the flow rate/passage of tritium.
As a first step, to improve the sensitivity of bremsstrahlung counting method, the effect of a gold evaporated window on the intensity of bremsstrahlung X-rays has been examined. The window plays important roles of the confinement of tritium and the emission of the bremsstrahlung X-rays. By using the gold coating window, it was seen that the detection limit was extended toward lower tritium concentration of about 0.1 muCi/cm^3. In addition to the above examination, some preliminary experiments were carried out using an apparatus constructed to test the applicability of bremsstrahlung counting method to the control system. As a result, it was seen from the preliminary tests that two control valves attached to the present apparatus precisely operated at a given concentration irrespective to the flow rate in the range from 7 to 54 cm^3/min. From those results, it was revealed that it was possible to develop a tritium control system based on the bremsstrahlung counting method.
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