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

IPC: G01N15/06 ,  B01D46/42

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

IPC: G01M3/04 ,  G01M3/20 ,  G01T1/167 ,  G01T1/169 ,  G01T7/02

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.

公开(公告)号：JPH07311272A

公开(公告)日：1995-11-28

申请号：JP10288394

申请日：1994-05-17

Applicant: ALOKA CO LTD

Inventor： MITO MASAYASU ,  NAKAOKA HIROSHI ,  OSHIMA TOSHINORI

IPC: G01T1/24 ,  G01T1/02 ,  G01T7/00

Abstract: PURPOSE:To reduce the directional dependency of the sensitivity of a detecting element in a radioactively ray detector using the element whose detecting surface is covered with a filter. CONSTITUTION:A detecting element 12 is covered with a Ti filter 22 of a spherical shell shape which centers on the center of a sensitive unit 12a. A detecting element 16 is covered by a Pb filter 26 of a spherical shell shape which centers on a center of a sensitive unit 16a. Accordingly, since a route length when the ray incident on the sensitive units of the elements 12, 16 pass through the filters 22, 26 becomes substantially constant despite the incident direction, there occurs no difference of diminishing operations of the filters 22, 26 according to the ray incident direction, thereby reducing the directional dependency of the sensitivities of the elements 12, 16.

公开(公告)号：JPH06258444A

公开(公告)日：1994-09-16

申请号：JP4931793

申请日：1993-03-10

Applicant: ALOKA CO LTD

Inventor： SATO HIROO ,  ONO TAKESHI ,  MITO MASAYASU

IPC: G01T1/167 ,  G01T1/185 ,  H01J47/02

Abstract: PURPOSE:To provide a radiation measuring equipment having a function for measuring radon present in a gas with high sensitivity and a function for measuring radon in real-time. CONSTITUTION:A first ionization chamber 10 comprises an electrode container 18, a current collecting electrode 20, and a first power supply circuit 22 for applying voltage between them. A second ionization chamber 12 comprises a container 26, a substance adsorbing radon, an outer electrode 29, a current collecting electrode 30, and a second power supply circuit 32. The first power supply section 22 applies a negative voltage to the electrode container whereas the second power supply section 32 applies a positive voltage to the outer electrode. Consequently, a negative pulse is generated from the current collecting electrode 20 in the first ionization chamber 10 and a positive pulse is generated from the current collecting electrode 30 in the second ionization chamber 12. A signal processing circuit performs signal processing for every characteristics of these pulses.

公开(公告)号：JPH068860B2

公开(公告)日：1994-02-02

申请号：JP14770089

申请日：1989-06-09

Applicant: ALOKA

Inventor： OKADA TOICHI ,  OOWAKI SHIGEHIRO ,  OOKUMA JUZO ,  SATO HIROO ,  MITO MASAYASU

IPC: G01T1/00 ,  G01T1/167

公开(公告)号：JPH068859B2

公开(公告)日：1994-02-02

申请号：JP18632489

申请日：1989-07-18

Applicant: ALOKA

Inventor： SATO HIROO ,  MITO MASAYASU

IPC: G01T1/17 ,  G01T1/163 ,  G01T1/167 ,  G01T1/172

公开(公告)号：JPH0551873B2

公开(公告)日：1993-08-03

申请号：JP29229887

申请日：1987-11-19

Applicant: ALOKA CO LTD

Inventor： SATO HIROO ,  MITO MASAYASU

IPC: G01T7/00 ,  G01T1/20

公开(公告)号：JPH0518386B2

公开(公告)日：1993-03-11

申请号：JP26496786

申请日：1986-11-07

Applicant: ALOKA

Inventor： SATO HIROO ,  MITO MASAYASU

IPC: G01N1/22 ,  G01T1/167

公开(公告)号：JPH0513042A

公开(公告)日：1993-01-22

申请号：JP15884091

申请日：1991-06-28

Applicant: ALOKA CO LTD

Inventor： SATO HIROO ,  MITO MASAYASU

IPC: G01T3/00 ,  H01J47/12

Abstract: PURPOSE:To ensure high sensitivity detection of only epithermal neutrons. CONSTITUTION:A rod-like collector electrode 22 is arranged on the inside of a box-like outside electrode 20, and helium -3 He is sealed therein. The output of the collector electrode 22 is connected to a measurement circuit 30. A moderator 32 such as polyethylene is provided on the lower part of the outside electrode 20, and an absorption layer 34 made of rubber including boron is arranged on the entire circumference of a detector. Thermal neutrons are absorbed by the absorption layer 34 and are not detected thereby. Accelerated neutrons are transmitted through the absorption layer 34 as well as the moderator 32 and are not detected thereby. Since only epithermal neutrons of 0.5-5X10 eV are transmitted through the absorption layer 34 and is moderated by the moderator 32 into thermal neutrons, nuclear reaction occurs and ionized charges are generated, which are detected as pulses.