-
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.
-
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.
-
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.
-
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.
-
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.
-
Patent Agency Ranking
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
-
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。
-
公开(公告)号：JPS5940142A
公开(公告)日：1984-03-05
申请号：JP15008382
申请日：1982-08-31
Applicant: Aloka Co Ltd
Inventor： SATOU WATARU , MITO MASAYASU , MAEKAWA HIROSHI , YANAI TOSHIO
CPC classification number: B01D46/442
Abstract: PURPOSE:To enable the measurement of dust concn. over a wide range with high accuracy irrespectively of the change in the dust concn. by measuring the pressure drop of the filtered and captured dust with a pressure sensor, exchanging a filter when the pressure drop of the dust exceeds a prescribed value and measuring the concn. of the dust always at a specified flow rate. CONSTITUTION:The drop P0 by the suction of a suction pump 10 is measured with a pressure gauge 16, and the filter loss P2 consisting of the total value of the drop P0 by the suction of the pump 10 and the pressure drop P1 of a constant flow rate device 12 is measured with a pressure sensor 18. A control section 20 to which the filter loss signal from the sensor 18 is inputted stops the pump 10 and exchanges a filter 14 when the filter loss P2 attains the prescribed value, that is, the limit value at which a set flow rate Q0m /min, can be maintained by the device 12. The pump 10 is driven again after the exchange and the suction of the dust in the atm. air is started.
Abstract translation: 目的：测量灰尘浓度。 在广泛的范围内，高精度，无论灰尘浓度的变化。 通过用压力传感器测量过滤和捕获的灰尘的压降，当灰尘的压降超过规定值时，更换过滤器并测量浓度。 的灰尘总是以指定的流量。 构成：用压力计16测量抽吸泵10的吸力的液滴P0，由泵10的吸力由液滴P0的总量构成的过滤器损耗P2和恒定的压降P1 流量装置12用压力传感器18测量。输入来自传感器18的滤波器损失信号的控制部分20在滤波器损耗P2达到规定值时停止泵10并交换滤波器14， 通过装置12可以维持设定流量Q0m 3 / min的极限值。在大气中的灰尘的交换和抽吸之后，再次驱动泵10。 空气开始
-
公开(公告)号：JPH09318760A
公开(公告)日：1997-12-12
申请号：JP13338896
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 enhance the sensitivity simultaneously capable of detecting neutron in each neutron energy range. SOLUTION: The neutron detector 8 comprises an outside container 10 formed of a thermal neutron shield member, a thermal neutron and fast neutron detector 12 made of an ionization chamber, and a moderator 14 for moderating thermal neutron by fast neutron. The thermal neutron and fast neutron are detected by the single detector 12. Only the fast neutron is detected in the state that only the detector 12 is contained in the container 10. The fast and intermediate speed neutron are detected in the state that the detector 12 and moderator 14 are contained in the container 10. The detected results are subtracted from one another to obtain the detected result of desired neutron as required.
-
公开(公告)号：JPH09257936A
公开(公告)日：1997-10-03
申请号：JP6598496
申请日：1996-03-22
Applicant: CHUBU ELECTRIC POWER , ALOKA CO LTD
Inventor： YONEMURA KENJI , MITO MASAYASU
Abstract: PROBLEM TO BE SOLVED: To provide a gas monitor which can precisely specify a leakage point of a radioactive gas and reduces burden to workers. SOLUTION: A suction unit 30 has a suction nozzle 32 for sucking gas (air), and an indicator 34 for displaying a measurement result. The suction nozzle 32 is connected to a detection tank 15 of a measurement unit 10 through a flexible hose 40. When a pump 12 of the measurement unit 10 is operated, gas around a suction port at the tip end of the suction nozzle 32 is sucked and guided into the detection tank 15 through the hose 40. A measurement result of the measurement unit 10 is given to the indicator 34 of the suction unit 30 by a cable 42. A worker carries the small, light-weight and portable suction unit 30 and searches for a leakage point of radioactive gas while watching display on the indicator 34.
-
-
-
-
-
-
-
-
-
Search Results
49
records
(took 0.022 seconds)
