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公开(公告)号：JPH0534633B2
公开(公告)日：1993-05-24
申请号：JP15253787
申请日：1987-06-19
Applicant: ALOKA
Inventor： SATO HIROO , MITO MASAYASU
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公开(公告)号：JPH055782A
公开(公告)日：1993-01-14
申请号：JP15883191
申请日：1991-06-28
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU , KUMAZAWA HIROKI
Abstract: PURPOSE:To provide the title detector capable of simply measure a neutron absorption dose becoming the basis of the evaluation of the dose equivalent of a neutron according to a direct reading system within a real time. CONSTITUTION:A collection electrode 22a is arranged in an external electrode 20a and an absorbing layer 24 (composed of rubber containing boron B) limiting the transmission of a thermal neutron in a constant ratio is arranged to the neutron incident surface of a thermal neutron detector in which nuclear reaction gas is sealed. An epithermal neutron detector equipped with a deceleration material 26 and covered with a thermal neutron absorbing layer 28 is arranged to the rear of the thermal neutron detector and a proton recoil scintillation detector 30 is further arranged. A part of a thermal neutron transmits through the absorbing layer 24 to reach the thermal neutron detector to be detected thereby. An epithermal neutron is decelerated by the deceleration material 26 to be converted to a thermal neutron and reaches the epithermal neutron detector to be detected thereby. A fast neutron is detected by the proton recoil scintillation detector 30.
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公开(公告)号：JPH0420893A
公开(公告)日：1992-01-24
申请号：JP12644290
申请日：1990-05-16
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
IPC: G01T3/00
Abstract: PURPOSE:To enable accurate measurement in wide range of energy region with ease and weighted by providing an ion chamber part charged with gas ionized by the incidence of neutron, an electric source, and a neutron filter. CONSTITUTION:A neutron equivalent dosimeter is loaded on a human body 26. If thermal neutrons 100-1 are irradiated from a neutron filter 14 side, these thermal neutrons 100-1 are absorbed by the filter 14. Thermal neutrons 100-2 pass through the path hole 14a of the filter 14 and slit directly in an ion chamber part 10. The incidence rate of thermal neutrons into the ion chamber part 10 is controlled by controlling the opening area of the path hole 14a. On the other hand, the medium and fast neutrons 200 radiated from the filter 14 side pass through the filter 14 and ion chamber 10 and reach the human body 26. Since the medium and fast neutrons 200 have reaction cross section area for 10B of 1/1000 that of thermal neutrons, they are scattered in the human body 26 and moderated to be thermal neutrons, and so the thermal neutrons 300 scattered in the back go into the ion chamber 10. Therefore, in the ion chamber 10, neutrons 100-2 passing through the path hole 14a and the thermal neutrons 300 scattered in the back are detected.
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公开(公告)号：JPH0359487A
公开(公告)日：1991-03-14
申请号：JP19557989
申请日：1989-07-28
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To easily change by one instrument between the measurement of various dosage equivalents before the revision of the law and the measurement of an irradia tion dosage before the revision by applying or stopping a voltage to a compensation ionization part by the switching of a voltage applying circuit. CONSTITUTION:A measurement ionization part 10 has an incidence window 14a for radiation measurement and applies a specific voltage to collect ionized charges to a current collecting electrode 18a. Further, the compensation ionization part 12 with specific-volume-ratio capacity which is formed at a position opposite the reverse surface of the incidence window 14a of the ionization part 10 has an application electrode 16 with the opposite polarity from the application electrode 14 of the ionization part 10 and the collecting electrode 18a limits the transmission of radiation. Then a partition plate 18 between the ionization parts 10 and 12 absorbs radiation incident on the ionization part 12 and an electrometer 20 connected to the collecting electrode 18a between the ionization parts 10 and 12 measures a collected current corresponding to an incidence dosage. Then the voltage applying circuit is switched to measure the dosage equivalent or irradiation dosage optionally according to whether or not the electrode 16 of the ionization part 12 is applied with the voltage having the oppo site polarity.
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公开(公告)号：JPH0312579A
公开(公告)日：1991-01-21
申请号：JP14770089
申请日：1989-06-09
Applicant: ALOKA CO LTD
Inventor： OKADA TOICHI , OOWAKI SHIGEHIRO , OKUMA JUZO , SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To execute the measurement in a real time and with high sensitivity by a miniature device by scavenging a radioactive material in the measuring air led into a flow part, and bringing its radiation dose to doubly integrated dosage measurement by a detector placed on the opposite side of a scavenging body. CONSTITUTION:In the inside of the upper half 100a of the body, a flow part 10 of measuring air is formed, its bottom part is closed up by a scavenging body 12 and the flow part 10 is formed like a closed case. On the other hand, in the inside of the lower half 100b connected to the upper half 100a with a hinge 24, a radiation detecting part 20 is formed, conductive packing 36 is provided on an abutting part to a frame 32 of the scavenging body 12, and a collecting electrode 22 is held in a space part. Subsequently, the scavenging body 12 is constituted by supporting a scavenging plate 30 formed by sintering a scavenging material together with clay mineral, and placing a mesh electrode 34 on the lower face. In this state, when a radioactive material in the air led into the flow part 10 is scavenged 12, the detecting part 20 partitioned and formed from the flow part 10 integrates and measures ionization charge generated by an incidence of a radiant ray, and by the doubly integrated dosage measurement for calculating the radiation dose, while scavenging the radioactive material, the measurement can be executed with high sensitivity.
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Patent Agency Ranking
公开(公告)号：JPH0159540B2
公开(公告)日：1989-12-18
申请号：JP15008382
申请日：1982-08-31
Applicant: ALOKA
Inventor： SATO WATARU , MITO MASAYASU , MAEKAWA HIROSHI , YANAI TOSHIO
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公开(公告)号：JPH01134291A
公开(公告)日：1989-05-26
申请号：JP29229887
申请日：1987-11-19
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To measure an effective dosage equivalent or 1cm-deep part dosage equivalent by a scintillation counter by providing windows which differ in thickness. CONSTITUTION:Small circular parts of berryllium are scattered over the entire surface of an aluminum plate, a 1st incidence window 34 where a radiation in a low energy area can be incident is arranged in front of a scintillator 32, and a 1st detection part 26 where a photoelectron multiplier tube 36 is provided across a quartz glass plate 14-1. A scintillator 42 which is a half as large as the scintillator 32 of the 1st detection part 26 is arranged across a 2nd incidence window 46 which is thick enough to increase the dose rate meter from an energy area of about 300keV to a high area. The photoelectron multiplier tube 46 is arranged on the scintillator 42 across quartz glass 4-2 to constitute a 2nd detection part 28. A difference computing element 50 calculates the output difference between the detection parts 26 and 28. A shield plate cap 56 composed of a plastic plate for effective dosage is provided. Consequently, the effective dosage or 1cm-deep part equipment is measured.
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公开(公告)号：JPH01134289A
公开(公告)日：1989-05-26
申请号：JP29229787
申请日：1987-11-19
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To measure substantial dosage in consideration of an influence upon a living body by an ionization chamber by providing windows which differ in thickness. CONSTITUTION:This dose rate meter is provided with a 1st detection part 24 having a 1st incidence window made of a thin window where a gamma ray and X ray having low energy are incident, a 2nd incidence window 32 having intermediate thickness where rays larger than intermediate energy are incident, and a 3rd detection part 28 having a 3rd incidence window 34 which is thick energy to make high-energy rays incident. Application electrodes 24b (24d) and 28b (28d) of the 1st and 3rd detection parts 24 and 28 are used as cathode, the application electrode 26b (21d) of the 2nd detection part 26 is used as a cathode, and the output of the 2nd detection part 26 is subtracted from the sum output of the 1st and 3rd detection parts 24 and 28. A shield plate cap 38 for deep part dosage which is made of a plastic plate is provided covering the 1st incidence window. Consequently, the 1cm-deep part dosage equivalent and effective dosage equivalent can be measured.
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公开(公告)号：JPS63118699A
公开(公告)日：1988-05-23
申请号：JP26496886
申请日：1986-11-07
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
IPC: G21F9/32
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公开(公告)号：JPS59187280A
公开(公告)日：1984-10-24
申请号：JP6066483
申请日：1983-04-08
Applicant: Aloka Co Ltd , Asahi Chem Ind Co Ltd
Inventor： KIMOTO KIYOUJI , EBISAWA MIKIO , KAGEURA YOSHIAKI , SATOU HIROO , MAEKAWA HIROSHI , MITO MASAYASU
CPC classification number: G01T1/178
Abstract: PURPOSE:To enable continuous measurement of tritium with a high sensitivity by separating tritium moisture from air containing the tritium moisture, radon or thoron employing a hollow yarn membrane made of a fluoride copolymer having a sulfonate group within a specified range of ion exchange capacity. CONSTITUTION:A hollow yarn membrane (a) 10-150mum thick made of a fluoride copolymer as milliequivalent/g H-type dry resin with the ion exchange capacity of 0.5-2.5 containing a duplicating unit of the formula I [(m) is 0 or 1 and (n) 2-5] is provided in a cell (f) being supported with a partition plate (g) with the inner diameter thereof set at 10-1,000mum to satisfy the formula II [IEC is a milliequivalent/g H-type dry resin and L the thickness (micron) of the hollow yarn membrane]. With such an arrangement, a sample air flows from the inlet (b) to the outlet (c) while a carrier gas flows from the inlet (d) to the outlet (e) to remove randon or thoron and thus, the correct concentration of tritium can be measured along with a less response time.
Abstract translation: 目的：通过将含氚水分，氡气或钍气的氚水分与含有磺酸盐基团的氟化物共聚物制成的中空丝膜分离在离子交换容量的规定范围内，可以高灵敏度地连续测量氚。 构成：将含有式I [（m）的复制单元的离子交换容量为0.5-2.5的毫当量/ g H型干燥树脂的氟化物共聚物制成的中空丝膜（a）为0〜 或者1和（n）2-5]设置在由内径为10-1000μm的隔板（g）支撑的电池（f）中以满足式II [IEC是毫当量/ g H型干树脂和L中空丝膜的厚度（微米）]。 通过这样的布置，样品空气从入口（b）流到出口（c），同时载气从入口（d）流出到出口（e）以去除兰顿或钍气，因此，正确的浓度 可以测量氚的响应时间较短。
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