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公开(公告)号：JPH09318759A
公开(公告)日：1997-12-12
申请号：JP13338796
申请日：1996-05-28
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , ONO TAKESHI , MITO MASAYASU
IPC: G01T3/00
Abstract: PROBLEM TO BE SOLVED: To make it possible to obtain total equivalent dose by measuring equivalent dose at each neutron energy range and adding them. SOLUTION: A detector 10 has a fast neutron detector 18, an intermediate speed neutron detector 16 and thermal neutron detectors 14A, 14B. Fast neutron is detected by utilizing recoiling, the intermediate speed neutron is transformed to thermal neutron by a moderator layer 44 and detected. The neutrons are individually detected at respective energy ranges. The layer 44 is utilized only for detecting the intermediate speed neutron.
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公开(公告)号：JPH08136663A
公开(公告)日：1996-05-31
申请号：JP27327994
申请日：1994-11-08
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , ONO TAKESHI , TSUJIMOTO TADASHI , YAMAZAKI KEIZO , IIDA TAKAO
Abstract: PURPOSE: To measure radon daughter nuclide and thoron daughter nuclide by separately measuring radon and thoron when measuring them. CONSTITUTION: A gas to be measured is introduced into a first detection unit 30 and α rays from radon and its daughter nuclide and thoron and its daughter nuclide are detected by an ionization box 36 while capturing the radon daughter nuclide and thoron daughter nuclide at one-side electrode 46 and improving detection sensitivity. The radon daughter nuclide, thoron, and thoron daughter nuclide in the gas to be measured are eliminated by a radon extraction means 54. In a second detection unit 32, while radon daughter nuclide which is generated due to the decay at or after a radon extraction means 54 is captured by an one-side electrode 146 and detection sensitivity is improved, α rays from the radon and its daughter nuclide are detected by an ionization box 136. Radon count value and thoron count value are obtained simply and economically from the output signals in real time.
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公开(公告)号：JPH0553396B2
公开(公告)日：1993-08-09
申请号：JP23577988
申请日：1988-09-19
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
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公开(公告)号：JPH0551871B2
公开(公告)日：1993-08-03
申请号：JP29229687
申请日：1987-11-19
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
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公开(公告)号：JPH0361883A
公开(公告)日：1991-03-18
申请号：JP19862089
申请日：1989-07-31
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To make it possible to measure both 1-cm dose equivalent and 3-mm dose equivalent efficiently with a single apparatus by providing a first incident window for transmitting a low energy region excellently and an adjusting window which can be freely attached to and removed from the first incident window. CONSTITUTION:A first incident window 29 and an adjusting window 30 are provided at a first detecting part 10. For example, a voltage of -500V is applied to an applying electrode 18 of the first detecting part 10. At this time, when, e.g. +20V is applied to a first capacitance correcting electrode 32, the effective volume of the ionization chamber of the first detecting part 10 can be reduced by about 4 - 5%. Thus, the total detecting sensitivity can be lowered by a specified level. Meanwhile, a voltage of +500V is applied to an applying electrode 20 of a second detecting part 12. At this time, when, e.g. -20V is applied to a second capacitance correcting electrode 34, the effective volume of the ionization chamber of the second detecting part 12 can be reduced by 4% or more. Thus the radiation of a characteristic curve 202 can be measured.
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Patent Agency Ranking
公开(公告)号：JPH0353187A
公开(公告)日：1991-03-07
申请号：JP18927689
申请日：1989-07-21
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To measure both of 1cm dose equivalent and 70mum dose equivalent by providing a first incidence window through which radioactive rays coinciding with the characteristic of 70mum dose equivalent measurement are transmitted, an adjustment window of 1cm dose equivalent measurement, and a capacity correcting electrode. CONSTITUTION:A first detecting part 10 is provided with a first incidence window 28 and an adjustment window 30. The adjustment window 30 is formed with several mg/cm thickness so that the total thickness of these windows 28 and 30 is about 30mg/cm , and the adjustment window 30 is freely detachably attached to the incidence window 28 by the cap system. Detecting parts 10 and 12 measure and display 70mum dose equivalent, and the detecting part 10 to adjust the level difference is provided with first capacity correcting electrodes 32a and 32b, and the detecting part 12 is provided with second capacity correcting electrodes 34a and 34b. Thus, both of 1cm dose equivalent and 70mum dose equivalent are efficiently measured with the single instrument.
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公开(公告)号：JPH0348791A
公开(公告)日：1991-03-01
申请号：JP18632489
申请日：1989-07-18
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To separate and measure the beta-rays in food and to facilitate routine measurement by providing a 1st detecting part which detects low-energy beta-rays and a 2nd detecting part and 3rd detecting part which have different absorption layers. CONSTITUTION:The beta-rays of low energy radiated from a sample 24 are detected by the 1st detecting part 26. The beta-rays exclusive of low energy are detected in the 2nd detecting part 30 and the hard cosmic rays are detected in the 3rd detecting part 34. The beta-rays and the cosmic rays exclusive of the low energy rays are eventually and simultaneously made incident to the 1st detector 26 and, therefore, only the electric pulses which are not simultaneously detected by the outputs of the 1st and 2nd detecting parts are taken out and the beta-rays of low energy are measured in a reverse simultaneous counter circuit 40. The measurement of, for example, cesium, is possible in this way. Since the cosmic rays are simultaneously made incident to the 2nd detecting part 30, the reverse simultaneous counting 42 of the outputs of the 2nd and 3rd detecting part is executed and the beta-rays exclusive of low energy are measured. The measurement of, for example, potassium, is possible in this way.
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公开(公告)号：JPH01134288A
公开(公告)日：1989-05-26
申请号：JP29229687
申请日：1987-11-19
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To measure an equivalent to effective dosage by a gas counter tube by providing two detection parts which differ in window thickness. CONSTITUTION:A thin front window 22a and a rear window 22b with intermediate thickness are provided to a 1st detection part 18. A current collecting electrode 24 is provided as an anode on the axis of a 1st cylinder part 22 as a cathode. Counted gas from a discharge chip pipe 28 is supplied to and charged in a 1st detection part 18. The volume of a 2nd cylinder part 30 which is a relatively thick window and a cathode is set 1/2 the volume of a 1st detection part to form a 2nd detection part 20. A differential computing element 38 calculates the output difference between both detection parts 18 and 20. Consequently, a 1cm-deep part dosage equivalent can be measured by the counter tube. Further, the 1st cylinder part 22 of the detection part 18 is covered with a shield container 42 for deep part dosage such as a plastic plate, thereby further measuring even the effective dosage equivalent.
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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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公开(公告)号：JPS61269090A
公开(公告)日：1986-11-28
申请号：JP10924285
申请日：1985-05-23
Applicant: ALOKA CO LTD , KOSAKO TOSHITAKA
Inventor： KOSAKO TOSHITAKA , NAKAOKA HIROSHI , SATO HIROO
Abstract: PURPOSE:To easily and quickly perform an accurate calibration by obtaining the response function of a neutron spectrometer from a neutron energy spectrum obtained in advance and enumerated data obtained by irradiating a plurality of reference radiation sources onto one neutron spectrometer. CONSTITUTION:A retarding container normally used as a part of a neutron detector 18 is used in common as a part of a reference radiation source. By hermetically sealing a neutron radiation source 22 with a known energy in the space within a neutron spectrometer 20 from which the neutron detector 18 is removed, a plurality of reference radiation sources with different energy levels are obtained. By obtaining enumerated data on the basis of the plurality of the reference radiation sources in one neutron spectrometer 20, the energy characteristic of the neutron spectrometer 20 can be obtained as a response function, whereby an accurate energy calibration can be performed.
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