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公开(公告)号：JP2002365317A
公开(公告)日：2002-12-18
申请号：JP2001176033
申请日：2001-06-11
Applicant: ALOKA CO LTD
Inventor： KATO TORU
Abstract: PROBLEM TO BE SOLVED: To prevent reduction in measurement accuracy which results from discharge path of accumulated charges in an electrometer circuit for ionization chamber, for integrating an input current to output voltage. SOLUTION: As the path for discharging an integrator 24 charged with the current from an ionization chamber detector 20, a first discharge path formed of a contact type electromagnetic relay 26 and a second discharge route formed of the serial connection of an electromagnetic relay 28 and a transistor switch 30 are provided in parallel to each other. The first discharge path has the characteristic of causing no leakage current, and the second discharge path can ignore the discharge period forming a dead time by the high-speed electronic operation of a semiconductor. At a low dose rate, where the influence of leakage current can be increased with a long charging time, the electromagnetic relay 28 is set to OFF, and charging and discharging is switched by the operation of the electromagnetic relay 26. At a high dose rate, where the use of a switch having a short dead time is suitable with a long charging period, the electromagnetic relay 26 is set to OFF, and the electromagnetic relay 28 is set to ON for switching the charging and discharging by the operation of the transistor switch 30.
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公开(公告)号：JP2006098081A
公开(公告)日：2006-04-13
申请号：JP2004281259
申请日：2004-09-28
Applicant: Aloka Co Ltd , アロカ株式会社
Inventor： KOBAYASHI YUSUKE , KATO TORU
Abstract: PROBLEM TO BE SOLVED: To inhibit static noise from having an affect to the minimum in radiological survey instruments, such as survey meters.
SOLUTION: The moving average value train is obtained by moving average operation of the measurement data (raw data) string. The static noise 200 is roughly divided into the 1st part and the 2nd part, wherein when the 1st part is detected the moving average values of the A-1 point obtained in the past in the interval of the 2nd part have been displayed. When the 2nd part of the waveform is detected the measured value ranging between the A point to the C point is eliminated from the object of the moving average operation. Thereby, the problem of the static noise being displayed is alleviated and the affection of static noise remaining in the moving average is prevented after its generation.
COPYRIGHT: (C)2006,JPO&NCIPIAbstract translation: 要解决的问题：抑制静电噪声对放射性测量仪器（如测量仪表）的影响最小。 解决方案：通过移动测量数据（原始数据）字符串的平均运算来获得移动平均值列表。 静态噪声200大致分为第1部分和第2部分，其中当检测到第一部分时，已经显示了在第二部分的间隔中过去获得的A-1点的移动平均值。 当检测到波形的第二部分时，从移动平均运算的对象中消除了从A点到C点之间的测量值。 由此，能够缓和显示静噪的问题，并且在移动平均线的生成后能够防止静止噪声的影响。 版权所有（C）2006，JPO＆NCIPI
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公开(公告)号：JP2001004758A
公开(公告)日：2001-01-12
申请号：JP17908299
申请日：1999-06-24
Applicant: ALOKA CO LTD
Inventor： KATO TORU
IPC: G01T7/00
Abstract: PROBLEM TO BE SOLVED: To obtain a radiation measuring apparatus in which a measuring range can be confirmed easily while an analog indication value is being observed by a method wherein a range display part which displays the measuring range selected at present is installed inside an analog display part. SOLUTION: For example, an analog pointer 42 which indicates a measured value, light emitting diodes(LEDs) 46 which indicate a measuring range and a multipurpose digital display part 44 which can display, e.g. various pieces of information are provided at the display part 40 of a survey meter. The multipurpose digital display part 44 is a liquid crystal display device of e.g. about 16 digits, and the various pieces of information are displayed according to the selection or the like of a measuring operator. The LEDs 46 are installed at respective selectable measuring ranges, and they are arranged in a prescribed sequence. Then, the LEDs 46 which correspond to a measuring range selected, e.g. by a range switch emit light, and the measuring range which is selected is displayed. When a measured value exceeds a preset threshold value, the LEDs 46 as a group are made to blink, and the LEDs are constituted so as to be used also as an alarm display.
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公开(公告)号：JPH11142521A
公开(公告)日：1999-05-28
申请号：JP30892497
申请日：1997-11-11
Applicant: ALOKA CO LTD
Inventor： NAKAOKA HIROSHI , KATO TORU
Abstract: PROBLEM TO BE SOLVED: To obtain a radiation detector in which a counting omission caused by a dead time can be corrected with good accuracy with reference to a radiation whose intensity is changed in terms of time. SOLUTION: Radiation counting rates from radiation measuring parts 2, 4 provided with semiconductor detectors 10, 12 whose sensing area is different are input to a computing circuit 6. The computing circuit 6 compares the counting rates from both radiation measuring parts 2, 4 in the form of their ratio or difference so as to find a corrected counting rate. In a process in which their ratio or difference is found, the degree of a reduction in the counting rate caused by a counting omission provided at the respective counting rates is cancelled, and the correction accuracy of the counting omission is enhanced.
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公开(公告)号：JPH03229187A
公开(公告)日：1991-10-11
申请号：JP2666690
申请日：1990-02-05
Applicant: ALOKA CO LTD
Inventor： KATO TORU , TATEISHI NAOKI , YANAI TOSHIO , OSHIMA TOSHINORI
IPC: G01T1/17
Abstract: PURPOSE:To easily read a counting rate value by displaying only digits which are converged on a specific criterion among the respective digits of the counting rate value and displaying specific characters other than numbers as other digits. CONSTITUTION:A control part 28 decides the effective digits of the counting rate value calculated by a divider 24. Then when a digit of 10(D10) are decided, it is judged whether or not the relative standard deviation (sigma) of the total number (N) is smaller than a predetermined effective digit criterion m10 for the digit of 10; when it is judged that sigma >= m10, an ineffective display of all digits, i.e. a display of specific characters other than numbers or a blinking display of specific intervals is made. When it is judged that sigma = m1, the blinking display as the ineffective display of digits other than the digit of 10 (D10) is made.
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Patent Agency Ranking
公开(公告)号：JP2005257383A
公开(公告)日：2005-09-22
申请号：JP2004067445
申请日：2004-03-10
Applicant: Aloka Co Ltd , アロカ株式会社
Inventor： KATO TORU
Abstract: PROBLEM TO BE SOLVED: To provide an ionization chamber radiation detector capable of high precision measurements, while being simple in constitution.
SOLUTION: The ionization chamber 10 outputs ionization current, corresponding to the incident radiation rays 60. The integration circuit 20 outputs the voltage, corresponding to the integration of input current including the ionization current. The operation part 40 calculates the radiation dose, based on the voltage digital converted by the ADC 30. The operation part 40 applies correction to the radiation dose, according to the determination of the existence of a current component in a direction reverse to the ionization current, such as leakage current, when the output voltage outputted from the integration circuit 20 via the ADC 30 is decreased.
COPYRIGHT: (C)2005,JPO&NCIPIAbstract translation: 要解决的问题：提供能够进行高精度测量的电离室辐射检测器，同时构造简单。 解决方案：电离室10输出对应于入射辐射线60的电离电流。积分电路20输出对应于包括电离电流的输入电流积分的电压。 操作部40基于由ADC 30进行了数字转换的电压来计算辐射剂量。操作部40根据与电离电流相反的方向的电流成分的存在的判定，对辐射剂量进行校正 当从积分电路20经由ADC 30输出的输出电压减小时，例如泄漏电流。 版权所有（C）2005，JPO＆NCIPI
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公开(公告)号：JP2002062359A
公开(公告)日：2002-02-28
申请号：JP2000249445
申请日：2000-08-21
Applicant: ALOKA CO LTD
Inventor： KATO TORU , NISHIMURA MIKIO , MATSUBARA SHOHEI , TATEISHI NAOKI
Abstract: PROBLEM TO BE SOLVED: To enable a radiation-measuring apparatus, for detecting γ-rays to measure in a low energy region by reducing cutting energy. SOLUTION: Output pulses from a radiation detector 20 and a plurality of radiation detectors 22 are bound and are counted at an OR circuit 24. The radiation detectors 22 detect charges generated by radioactive rays in a radiation detection semiconductor element 42, without being converted to a light at a scintillator, while conversion into the light at the scintillator is interposed in the radiation detector 20. A lower cut level can be set to the radiation detectors 22 than to the radiation detector 20 because of this difference of methods of detecting the radioactive rays. The measuring apparatus has a measuring range extended towards the low energy side.
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公开(公告)号：JP2000131437A
公开(公告)日：2000-05-12
申请号：JP29921798
申请日：1998-10-21
Applicant: ALOKA CO LTD
Inventor： TATEISHI NAOKI , KATO TORU , NISHIMURA MIKIO
Abstract: PROBLEM TO BE SOLVED: To exclude magnetic noise from a personal dosimeter as much as possible. SOLUTION: An internal shield container 12 is provided in a housing 10 as an external shield container, and detecting part shield containers 14 and 16 are provided in the internal shield container 12. Optical transmission is performed in such a way as to sandwich each shield container. In addition, the first battery part 110 and the second battery part 114 are provided inside and outside the internal shield container 12, and they function independently. A charge terminal 102 is electrically connected to the battery parts 110 and 114 at the time of charging, and a power source line is cut off by a cut-off circuit 112 at the time of non-charging. Magnetic noise is cut off in both respects of signal lines and the power source line.
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公开(公告)号：JPH1123720A
公开(公告)日：1999-01-29
申请号：JP18328197
申请日：1997-07-09
Applicant: ALOKA CO LTD
Inventor： KATO TORU
IPC: G01T1/185
Abstract: PROBLEM TO BE SOLVED: To detect radiation even when a capacitor is reset, and to eliminate a detection blank time by constituting a device with first and second reset switches that are short-circuited at different timings. SOLUTION: A radiation detection device consists of, for example, an ionization box 30 that is constituted of a container 32 and two power collection electrodes 34 and 36 and two parallel conversion circuits 38 and 40. The conversion circuits 38 and 40 have the same configuration, are separated electrically, and operate independently. Each reset switch 46 that the conversion circuits 38 and 40 have is controlled so that the reset timings differ each other and no reset is made while reset is made by one reset switch. Although, for example, the dose of radiation is calculated based on the output signal of the conversion circuits 38 and 40, radiation can be constantly detected, for example, by referring to the other output signal during a reset period in one output signal, thus the overlooking of an important phenomenon, and the like can be avoided.
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公开(公告)号：JPH07225279A
公开(公告)日：1995-08-22
申请号：JP1605494
申请日：1994-02-10
Applicant: ALOKA CO LTD
Inventor： KATO TORU
IPC: G01T1/169
Abstract: PURPOSE:To provide a radioactive surface contamination detector in which a radiation is measured with definite detection efficiency even when an object to be measured has an uneven part or even when the distance between the object to be measured and a detection part for the radioactive surface contamination detector cannot be kept definite. CONSTITUTION:A radiation which is radiated from a radioactive substance which has adhered to the surface of an object to be measured is measured by a probe 14, and, at the same time, the distance between the object to be measured and the probe 14 is detected by a distance detector 24. Then, on the basis of the distance detected by the distance detector 24, a contaminationdegree conversion part 26 converts a measured value measured by the probe 14 into a radiation contamination degree which is measured from a prescribed distance with reference to the object to be measured. Consequently, even when the relative distance between the probe 14 and the object to be measured is changed, the radiation is measured with definite detection efficiency, and the contamination degree can be measured.
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