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公开(公告)号：JPH08136661A
公开(公告)日：1996-05-31
申请号：JP27327794
申请日：1994-11-08
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , TSUJIMOTO TADASHI , YAMAZAKI KEIZO , IIDA TAKAO
Abstract: PURPOSE: To perform measurement without requiring an ion precipitator by measuring only radon/thoron as a parent nuclide without being affected by a daughter nuclide. CONSTITUTION: A face-shaped one-side electrode 42 is laid out near an α-ray incidence window 34 of an ionization box 28 and the other-side electrode 44 is laid out away from it. A high voltage is applied to radon daughter nuclide and thoron daughter nuclide with polarities to be captured by the other-side electrode 44 between both electrodes 42 and 44. The α rays from radon and thoron advance inside the ionization box 28 from the α-ray incidence window 34 and are detected. The α rays from the radon daughter nuclide and thoron daughter nuclide captured by the other-side electrode 44 do not reach the α-ray incidence window 34 and cannot be detected. Even if another ion enters a gas introduction chamber 30, it does not affect measurement unless it is radioactive, thus eliminating the need for an ion recipitator.
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公开(公告)号：JPH05333156A
公开(公告)日：1993-12-17
申请号：JP13496692
申请日：1992-05-27
Applicant: ALOKA CO LTD
Inventor： MITO MASAYASU , ONO TAKESHI , SATO HIROO
IPC: G01T1/20
Abstract: PURPOSE:To measure radioactive rays in a wide energy range at good sensitivity with solid scintillators. CONSTITUTION:Three scintillators 14, 16, 18 are arranged at a detection section, and detecting holes 14a, 16a, 18a are formed on the scintillator blocks 14, 16, 18. The scintillator block 14 is for low energy, and the scintillator blocks 16, 18 are for intermediate energy and high energy respectively. The hole diameter of the detecting hole 14a is the smallest, and the number of the detecting holes 14a is the largest. The hole diameter of the detecting hole 18a is the largest, and the number of the detecting holes 18a is the smallest. The energy sensitivity differs for individual scintillator blocks 14, 16, 18, and constant sensitivity can be maintained over a wide energy range as a whole.
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公开(公告)号：JPH05322735A
公开(公告)日：1993-12-07
申请号：JP13334492
申请日：1992-05-26
Applicant: ALOKA CO LTD
Inventor： SATO HIROO
Abstract: PURPOSE:To measure the moisture content of an object quickly and accurately and automate the measuring process. CONSTITUTION:A neutron beam source 14 is installed in a neutron sensing vessel 40, and an object to be measured 12 is placed in the upper part of the vessel 40. Part of neutrons emitted from the source 14 are turned into thermal neutrons by the object 12, and those of the thermal neutrons which are diffused behind are sensed by a thermal neutron sensor 16. A calculating means 18 calculates the moisture content of the object from the number of thermal neutrons.
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公开(公告)号：JPH0553386B2
公开(公告)日：1993-08-09
申请号：JP19862089
申请日：1989-07-31
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
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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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Patent Agency Ranking
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：JPH0434828A
公开(公告)日：1992-02-05
申请号：JP14179190
申请日：1990-05-30
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , YAMAMOTO YUKIYOSHI , SAKUMA YOICHI
Abstract: PURPOSE:To obtain a simple detector detecting a high-density neutron beam in real time without the effect of a gamma-ray by detecting a neutron beam and a gamma-ray in a first ionization chamber and concurrently detecting the gamma-ray in a second ionization chamber with specific gas sealed in each of the said chambers, and eliminating the participation of the gamma-ray, based on each output of the first and second ionization chambers, to detect a neutron. CONSTITUTION:Output by a neutron and a gamma-ray is obtained in the neutron detection ionization chamber 26 of a first ionization chamber which is injected with the BF3 gas of a first gas including a neutron-reactive atom and generating ionization by the incidence of the neutron and the gamma-ray, and output by only the gamma-ray is gained in the gamma- ray detection ionization chamber 28 of a second ionization chamber which is injected with the BF3 gas of a second gas including an atom, which is the isotope of the neutron-reactive atom and nonsensitivity to the neutron, and producing the ionization by the incidence of the gamma-ray and not producing the ionization by the incidence of the neutron. Then participation of the gamma-ray relating to neutron detection is eliminated and the output by only the neutron is obtained, by determining the sum of the outputs of the ionization chambers 26 and 28 when the applied voltage of them has reversed polarity, or by having the difference between the outputs of the ionization chambers 26 and 28 when first applied voltage has the same polarity, and thus a simple gamma-ray compensated neutron detector which can correctly detect the neutron is obtained.
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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：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：JPH0361884A
公开(公告)日：1991-03-18
申请号：JP19862189
申请日：1989-07-31
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MAEKAWA HIROSHI , HAGINO YOSHIZO
IPC: G01T1/16
Abstract: PURPOSE:To measure weak radiation or radiation of low energy excellently by forming ionized charge flux which is accelerated with a cathode and an anode, and detecting the magnetic flux generated by the ionized charge flux. CONSTITUTION:A cathode 36 and an anode 38 are supported with insulating posts 40 with an interval of about 5-20cm being provided. For example, a voltage of 1,000V is applied across the electrodes. The voltage is set based on the interval between the cathode 36 and the anode 38 and the kind of a gas when the detector is placed in an gaseous atmosphere. Then, ionized charge is accelerated and amplified by the high voltage. The ionized charge flux which flows from the cathode 36 to the anode 38 as shown by a numeral 100 in the figure is formed. The ionized charge generated by radiation is not measured as electric pulses as in a conventional device, but the ionized charge flux is formed and the ring-shaped magnetic flux generated by the ionized charge flux is detected. Thus, the amount of radiation or exo-electrons can be measured.
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