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1. 发明专利

JPS56143975A RADIATION DOSE MONITORING METHOD FOR ENVIRONMENT AROUND NUCLEAR POWER FACILITIES 失效
公开(公告)号：JPS56143975A
公开(公告)日：1981-11-10
申请号：JP4730880
申请日：1980-04-10
申请人： NIPPON ATOMIC IND GROUP CO , TOKYO SHIBAURA ELECTRIC CO
发明人： KARASAWA HIDEAKI , KITADA YOSHIO , ITOU TOSHIAKI
IPC分类号： G01T1/16 , G01T7/02 , G21C17/00
摘要： PURPOSE:To discriminate facilities-contributing radiation dose with good accuracy by excluding the predetermined time before and after the signal detection of a prescribed meter, calculating the background line, subtracting the same from sampling data and determining the facilities-contributing radiation dose. CONSTITUTION:If the time within 5hr before the precipitation signal (b) by the precipitation meter is detected and the time within 7hr after the detection are defined as the exclusion period of the dose rate increased by precipitation, the average value S of the radiation dose rate is prevented from rising more than needed by the exclusion of the dose rate a2 increased by precipitation. Hence, if this average value S is subtracted as a background radiation dose rate from the sampling data, the facilities-contributing radiation doses X1, X2... are discriminated on the safe side with good accuracy, and the radiation dose of the environments around nuclear power facilities is monitored highly accurately.

2. 发明专利

JPS55125469A SUPERVISORY METHOD OF RADIANT RAY IN CIRCUMFERENTIAL ENVIRONMENT OF NUCLEAR POWER PLANT 失效
公开(公告)号：JPS55125469A
公开(公告)日：1980-09-27
申请号：JP3235979
申请日：1979-03-22
申请人： NIPPON ATOMIC IND GROUP CO , TOKYO SHIBAURA ELECTRIC CO
发明人： KATAOKA KEIICHI , UEDA TATSUMI , KARASAWA HIDEAKI , KOBAYASHI AKIRA
IPC分类号： G01T1/16 , G01T1/167
摘要： PURPOSE:To sense the radiant ray emitted from the plant precisely by installing a pool, which is filled with water, below the detector to cut off the main natural background radiant ray and by measuring the quantity of radiant ray. CONSTITUTION:The radiant ray detector 1 is provided above the pool 3, which is filled with warm waste water, at the central position. The warm waste water 2 is fed from the feed pipe 4 to the pool and is overflowed and discharged from the drain pipe 5. The pool 3 i surrounded by the soil 6. In this way, when the radiant ray detector is installed at a height of 1-1.5m on the ground, the quantity of radiant ray detected by the detector is not influenced by the natural background radiant ray because the radiant ray from the activity of the soil is cut off even through the state of soil is varied.

3. 发明专利

JPS62297775A RADIATION MEASURING INSTRUMENT AND EVALUATING INSTRUMENT FOR RADIATION DOSAGE RATE DISTRIBUTION 失效
公开(公告)号：JPS62297775A
公开(公告)日：1987-12-24
申请号：JP13930586
申请日：1986-06-17
申请人： NIPPON ATOMIC IND GROUP CO
发明人： KARASAWA HIDEAKI
IPC分类号： G01T1/16
摘要： PURPOSE:To save labor and to reduce the exposure of a radiation measuring operator and to measure a radiation dosage rate by providing a radiation detector, a shield body, a driving device, a range finder, etc. CONSTITUTION:A radiation measuring instrument 1 is constituted by arranging a measurement part 4 on the universal head 3 of expansible measuring instrument support legs 2. A preamplifier 5 connected to a measurement part 4 is arranged under the universal head 3 and an amplified signal is sent to a signal processing part by a cable 6 when necessary. The measurement part 4 is equipped with the radiation detector 11 arranged in the shield body 9 with an opening part 8 and the range finder 12 fitted to the opening part 8. A driving mechanism which directs the opening part 8 of the shield body in various directions is arranged on the universal head 3. Then, the measuring instrument 1 has the universal head 3 rotated in various directions under the control of a computer and the opening part 8 is set in the direction of radiation source equipment, etc., in a target area successively; and a radiation dosage rate at each position and information on the distance between those positions and radiation measuring instrument 1 are stored in a computer.

4. 发明专利

JPS62118285A RADIATION MONITOR 失效
公开(公告)号：JPS62118285A
公开(公告)日：1987-05-29
申请号：JP25769385
申请日：1985-11-19
申请人： NIPPON ATOMIC IND GROUP CO
发明人： KARASAWA HIDEAKI
IPC分类号： G01T1/16 , G01T7/00
摘要： PURPOSE:To decrease an overall length of a cable, and also to simplify an installation or removal work of a radiation detecting system by providing a monitor body for inputting and processing detected data sent out of the radiation detecting system, through a closed loop-shaped line. CONSTITUTION:A monitor body 33 is provided with a synchronizing signal generator. a synchronizing signal outputted from this synchronizing signal generator is superposed on this cable 32 and transmitted, and supplied to all radiation detecting systems 2-1-2-30 through a connector 34. These radiation detecting systems 2-1-2-30 input this synchronizing signal, and send out the detected data (radiation detected pulse) in a time zone which has been allocated to itself, based on said signal as a reference. This detected data are also superposed to the cable 32. The monitor body 33 amplifies the detected data sent from each radiation detection system 2-1-2-30, by a main amplifier, discriminated by a crest discriminator, displayed by an indicator at every measuring place, and also recorded by a multi-channel recorder. That it to say, since a closed loop-shaped line for including a measuring point which is forecast in advance is laid, an overall length of the cable can be shortened.

5. 发明专利

JPS61245076A DOSIMETER 失效
公开(公告)号：JPS61245076A
公开(公告)日：1986-10-31
申请号：JP8554085
申请日：1985-04-23
申请人： NIPPON ATOMIC IND GROUP CO
发明人： KARASAWA HIDEAKI
IPC分类号： G01T1/00 , G01T1/02 , G01T1/15 , G01T1/17
摘要： PURPOSE:To grasp an exposure state as a time series by deriving an exposure quantity per unit time from a detected radiation dose of a radiation detector. CONSTITUTION:A radiation dose detecting signal of a radiation detector 4 is counted by an integral part 7, and an integral dose extending from an inlet area to an outlet area of a management area is displayed on a display 6. A time counting part 8 outputs a counting pulse 14 to an integrator 7 at every unit time, and the integrator 7 outputs a counting value of that time, namely, an exposure dose to a RAM 91. An exposure dose data which has been written in the RAM 91 is read successively in a host computer through an output line 163 and an output terminal 11, and an exposure dose of per unit time is grasped. In this case, by a time series exposure dose data, the exposure dose can be managed delicately.

6. 发明专利

JPS57116276A RADIATION DETECTOR 失效
公开(公告)号：JPS57116276A
公开(公告)日：1982-07-20
申请号：JP252481
申请日：1981-01-09
申请人： NIPPON ATOMIC IND GROUP CO
发明人： KARASAWA HIDEAKI
IPC分类号： H01J47/02 , G01T1/18 , G01T1/185
摘要： PURPOSE:To perform the calibration of the measuring system including the radiation detector only by the electric signal without using radiation by providing a thermion emitting body in an ionized gas in the radiation detector utilizing the ionizing action of radiation and taking out the constant electric signal to the outside of the radiation detector. CONSTITUTION:The radiation detector 11 utilizing the ionization such as an ionization chamber incorporates a thermion emitting body 12 wherein W and the like are used in the ionized gas. A constant current circuit 13 is connected to said thermion emitting body 12. The thermion is emitted by flowing a constant current. The ionization current having constant strength is taken out of a positive electrode 14 by the electric field applied to the radio detector 11, and the calibration of the entire measuring system including the radiation detector 11 can be performed by the electric signal. Instead of said thermion emitting body 11, the same calibration can be performed by emitting light from a light emitting device 17 by utilizing a photoelectron generator 18 and using the photoelectron generated in said photoelectric generator 18.

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