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公开(公告)号：JPS55126879A
公开(公告)日：1980-10-01
申请号：JP3436879
申请日：1979-03-26
Applicant: ALOKA CO LTD
Inventor： OOSHIMA TOSHINORI , YOSHIZUMI MINORU
IPC: G01T1/18
Abstract: PURPOSE:To make it possible to reduce the consumption of counting gas by making use of counting gas efficiently by supplying the gas to a detector by circulating. CONSTITUTION:At the time of the start of counting, counting gas is supplied from counting gas cylinder 10 to a detector system and pump system by way of on-off valve 12 and pressure regulator 14 and after the inside air of the systems ia substituted with the counting gas, on-off valve 26 is closed to fill both the systems with the counting gas. Next, circulating pump 22 circulates the counting gas in the systems via the closed loop of detector 18 and circulation passage 20. In this circulation, the volume of counting gas supplied from cylinder 10 is decreased through the adjustment of pressure regulator 14 and at the same time, when the inside pressure of the systems exceeds a fixed value, the counting gas is discharged into the air via check valve 30, thereby keeping the inside pressure of the systems constant.
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公开(公告)号：JPS63318060A
公开(公告)日：1988-12-26
申请号：JP15254187
申请日：1987-06-19
Applicant: ALOKA CO LTD
Inventor： KOYANO AKIRA , OSHIMA TOSHINORI , SATO HIROO , MAEKAWA HIROSHI , YANAI TOSHIO , YOSHIZUMI MINORU , SATOU SEIGO
Abstract: PURPOSE:To effectively prevent the incidence of ultraviolet rays or the like and correctly measure radioactive rays by forming a radioactive ray incidence window with titanium foil. CONSTITUTION:A radioactive ray incidence window 20 is formed with a layer of titanium foil, the radioactive ray incidence window 20 has the thickness of about 6-7mu, and its periphery is welded to a cathode cylinder 12. Since the titanium foil has sufficient strength regardless of its thickness of 6-7mu a counter tube 10 is not broken even if its interior is in a decompressed state. It abounds in the light shielding property and can reliably prevent the incidence of ultraviolet rays or the like. The miscount due to the photoelectric effect is thereby prevented, and radioactive rays can be correctly detected.
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Patent Agency Ranking
公开(公告)号：JPH046063B2
公开(公告)日：1992-02-04
申请号：JP15254187
申请日：1987-06-19
Applicant: ALOKA
Inventor： KOYANO AKIRA , OOSHIMA TOSHINORI , SATO HIROO , MAEKAWA HIROSHI , YANAI TOSHIO , YOSHIZUMI MINORU , SATO SEIGO
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公开(公告)号：JPS53143382A
公开(公告)日：1978-12-13
申请号：JP5837677
申请日：1977-05-20
Applicant: ALOKA CO LTD
Inventor： KOTANINO AKIRA , YOSHIZUMI MINORU
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公开(公告)号：JPH0369139B2
公开(公告)日：1991-10-31
申请号：JP4529086
申请日：1986-03-04
Applicant: ALOKA
Inventor： SATO HIROO , OOSHIMA TOSHINORI , YANAI TOSHIO , YOSHIZUMI MINORU , MATSUBARA SHOHEI
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公开(公告)号：JPS62206757A
公开(公告)日：1987-09-11
申请号：JP4529086
申请日：1986-03-04
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , OSHIMA TOSHINORI , YANAI TOSHIO , YOSHIZUMI MINORU , MATSUBARA SHOHEI
Abstract: PURPOSE:To make it very easy to manufacture a thin window, by forming a window material in a thin membrane at a surface of a protective plate, and then processing the protective plate into a specific form of a protective frame through the etching process. CONSTITUTION:At first, a window material is pasted or vacuum evaporated on a protective plate 20 to form a thin membrane 22. Then, a photoresist layer 24 is spread and formed at the other side of the protective plate 20. After that, a masking plate 26 with cuttings responding to the radioactive beam permeable holes of the thin membrane protective frame is arranged opposite to the layer 24, and the light is radiated over the masking plate 26. When it is washed in such a condition, only exposed portions of the layer 24 remain as solid membranes 24a and the unexposed portions are removed, to expose the protective plate 20. Then, by processing the protective plate 20 in an acid solution, only the portions of the protective plate 20 covered by the solid membranes 24a remain, and the exposed portions are solved and removed. As a result, the remaining portions 20a of the protective plate 20 make the protective frame of the thin membrane 22. Thus, a thin window 30 incorporating the protective frame and the thin membranes can be easily manufactured.
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公开(公告)号：JPS599844A
公开(公告)日：1984-01-19
申请号：JP11693282
申请日：1982-07-07
Applicant: Aloka Co Ltd
Inventor： SATOU HIROO , MAEKAWA HIROSHI , YOSHIZUMI MINORU
CPC classification number: H01J47/067
Abstract: PURPOSE:To make the measurement of thickness in an optional radioactive substance contained in sample gases stably achievable for a long period of time in an accurate manner, by turning a vacant space between negative pole (cathode) cylinders for a center counter and a guard counter into a beta ray absorbing layer. CONSTITUTION:The maximum range of beta rays emitted by tritium contained in the air is about 6mm. or so in ambient air while the range of alpha rays emitted by a natural radioactive isotope contained in the air is about 5cm or so. Making full use of these data, an interval length 1 between a center counter negative pole cylinder 10b and a guard counter negative pole cylinder 12b is set down to 7mm., more than 6mm. in the maximum range of the beta rays whereby the beta rays emitted by tritium contained in the sampling air are all attenuated and absorbed inside a vacant space A surrounded by these negative pole cylinders 10b and 12b, thus incidence of the beta rays into the guard counter 12 is prevented. Therefore, inside the guard counter 12, a background portion for the alpha rays contained in the sampling air inside the center counter 10, in addition to cosmic rays, can be accurately measured.
Abstract translation: 目的：通过转动中心计数器的负极（阴极）气缸和防护计数器之间的空位，使样品气体中所含的任选放射性物质中的厚度测量能够长时间稳定地实现， 进入β射线吸收层。 构成：空气中含有的氚发射的β射线的最大范围约为6mm。 在空气中包含的天然放射性同位素发射的α射线的范围约为5cm左右。 充分利用这些数据，将中心反极性负极气缸10b和防护反极性负极气缸12b之间的间隔长度1设定为7mm，大于6mm。 在β射线的最大范围内，由采样空气中包含的氚发射的β射线全部被这些负极气缸10b和12b包围的空白空间A内的衰减和吸收，因此β射线入射到防护计数器 12被防止。 因此，在防护计数器12内部，除了宇宙射线之外，还可以精确地测量中央计数器10内的取样空气中所含的α射线的背景部分。
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