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公开(公告)号：JPH0553388B2
公开(公告)日：1993-08-09
申请号：JP6758488
申请日：1988-03-22
Applicant: KOGYO GIJUTSUIN , ALOKA CO LTD
Inventor： IKEDA KYOJI , SAKANASHI TAKESHI , YANAI TOSHIO
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公开(公告)号：JPH0426073B2
公开(公告)日：1992-05-06
申请号：JP22069983
申请日：1983-11-25
Applicant: ALOKA
Inventor： OOSHIMA TOSHINORI , YANAI TOSHIO , TATEISHI NAOKI
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公开(公告)号：JPH03225293A
公开(公告)日：1991-10-04
申请号：JP2093790
申请日：1990-01-31
Applicant: ALOKA CO LTD
Inventor： KATO TORU , TATEISHI NAOKI , YANAI TOSHIO , OSHIMA TOSHINORI
Abstract: PURPOSE:To improve statistic accuracy with the lapse of time and to obtain a count value whose indication value is not sharply changed by displaying a counting rate value obtained by dividing an integrated value obtained by integrating values by an adder by the time required from detection start up to the current time. CONSTITUTION:When a radiant ray is injected into a detector 12, low pressure vapor (alcohol steam, etc.) is ionized, electric discharge is generated and a discharge current is instantaneously allowed to flow and A/D converted into a digital signal 100. The signal 100 is amplified by an amplifier 14 and the amplified digital signal 101 is counted by a counter 16. A sampling circuit 20 outputs a timing pulse 102 in each previously set time, the count value 103 of the counted signal 101 is outputted to an adder 18 in each timing and the counter 16 is reset by the count signal 103. The adder 18 integrates the count value 103 successively outputted from the counter 16 and outputs the total number 105 of counts from the count starting point up to the current point to a divider 24. The divider 24 calculates the count rate value, which is displayed on a display device 26.
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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：JPS618954B2
公开(公告)日：1986-03-18
申请号：JP6787780
申请日：1980-05-23
Applicant: Aloka
Inventor： NIWAYAMA HIROAKI , YANAI TOSHIO
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Patent Agency Ranking
公开(公告)号：JPS56164978A
公开(公告)日：1981-12-18
申请号：JP6787780
申请日：1980-05-23
Applicant: ALOKA CO LTD
Inventor： NIWAYAMA HIROAKI , YANAI TOSHIO
Abstract: PURPOSE:To provide a titled detector of superior shading characteristic and good operability by turning a shading cylinder and making the controlling for mounting, dismounting and positioning of a scintillator vessel easy. CONSTITUTION:The mounting and dismounting states of a scintillator vessel 24 are shown in the figure. At this time, a shading cover 34 is so turned and positioned as to oppose to the open and close mark 56 attached to the case 54 of the body 10 of a measuring device with respect to a reference mark 52. In this state, a lock pin 42 is in the position matching the notch 46 of a retainer ring part 44, and therefore the cover 34 can be opened and closed freely with respect to a shading cylinder 22. Since an energizing spring 32 is provided between the bottom part of the cylinder 22 and a vessel receiving plate 30, if the cover 34 is opened, the vessel 24 on the plate 30 is pushed out to the outside of the cylinder 22 by the pressing force of the spring 32, by which the removal of the vessel 24 is accomplished extremely easily.
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公开(公告)号：JPS60113173A
公开(公告)日：1985-06-19
申请号：JP22069983
申请日：1983-11-25
Applicant: ALOKA CO LTD
Inventor： OOSHIMA TOSHINORI , YANAI TOSHIO , TATEISHI NAOKI
Abstract: PURPOSE:To measure accurately a pollutive radiation dose by operating a false background (BG) radiation dose before and after the start of measurement in an arithmetic circuit and subtracting a BG radiation dose in accordance with presence/absence of the variation and the segulation. CONSTITUTION:A BG detector 12 is arranged near each of radiation detectors 10 (10a-10e). Detectors 10 and 12 generate rays corresponding to a radiation dose, and these rays are converted to electric pulse signals proportional to the quantity of light, and they are supplied to pollutive radiation dose counters 16 (16a-16e) and BG radiation dose counters 18 through amplifying circuits 14a- 14f. Counters 16 count the BG radiation dose before measurement of the pollutive radiation dose and the total radiation dose at the measurement time, and counters 18 count the false BG radiation dose after and before the start of measurement. Radiation doses counted by counters 16 and 18 are supplied to an arithmetic circuit 20, and the circuit 20 operates the regulation of the false BG radiation dose before and after the start of measurement, and BG subtraction is performed in accordance with the regulation and the net pollutive radiation dose of a material to be examined is displayed on a display device 22.
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公开(公告)号：JPH0513472B2
公开(公告)日：1993-02-22
申请号：JP29210185
申请日：1985-12-26
Applicant: ALOKA
Inventor： OOSHIMA TOSHINORI , YANAI TOSHIO , MATSUBARA SHOHEI
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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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公开(公告)号：JPH01187488A
公开(公告)日：1989-07-26
申请号：JP1235188
申请日：1988-01-21
Applicant: ALOKA CO LTD
Inventor： MATSUBARA SHOHEI , TATEISHI NAOKI , YANAI TOSHIO , KOYANO AKIRA
IPC: G01T1/17
Abstract: PURPOSE:To decide radioactivity contamination in a short time by making an advance to a next decision step when a set stepwise alarm level is exceeded and deciding that the contamination is below an alarm level when not. CONSTITUTION:A radiation monitor circuit is equipped with a detector 10 which measures the radioactivity of a body at respective parts and a timer 12 which outputs a signal at prescribed intervals of time. Further, a decision level setter 14 which sets the alarm level and stepwise alarm level for deciding the radioactivity contamination and a comparator 16 which compares the outputs of the detector 10 and setter 14 with each other are provided, and the output of the comparator 16 is supplied to a display device 18. This constitution divides a conventional measurement time into respective stages and a final alarm level is decided with stepwise alarm levels set in respective decision steps. Consequently, the decision is finished early from persons who are less contaminated, and the radioactivity contamination is measured speedily.
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