Portable intensitometer and apparatus for centralized control of exposure using the intensitometer

• US 5,099,127 A
• Filed: 09/30/1988
• Issued: 03/24/1992
• Est. Priority Date: 02/02/1987
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Kawasaki, Satoru, Izumi, Shigeru, Mitani, Shinji, Koiwa, Yukito, Suzuki, Satoshi, Kondo, Masahiro, Kitaguchi, Hiroshi, Hayashi, Tatsuo
• Primary Examiner(s): Fields, Carolyn E.
• Application Number:
  US07/274,998
• Time in Patent Office: 1,271 Days
• Field of Search: 250/370.07, 250/336.1, 250/388, 250/372, 364/413.26, 340/600
• US Class Current: 250/370.07
• CPC Class Codes: G01T 1/02 Dosimeters G01T1/15 takes precedence
• CPC Class Codes: G01T 1/026 Semiconductor dose-rate meters
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors

Abstract

A portable intensitometer including a radioactive radiation detector, an operation processing device for digitally processing the output signal of the radioactive radiation detector, and a device which produces a processed result of the operation processing device, wherein the improvement further includes a device for storing the data of exposure history and exposure control values of an individual person, and an interface which is connected to the storage device and to said operation processing device to input or output the data relative to an external equipment. The operation processing device carries out exposure control calculation for an individual person relying upon the output signals from the radioactive radiation detector and upon the read signals from the storage device. Therefore, the daily control, weekly control and monthly control are carried out in real time for each of the individual persons, to realize perfect exposure control for the individual persons.

Claims

1. An intensitometer capable of being carried by hand comprising a radioactive radiation detector, operation processing means for digitally processing output signals of said radioactive radiation detector, means for producing a processed result of said operation processing means, storage means for storing exposure control values and exposure history data of an individual person, and an interface which is connected to said storage means and to said operation processing means to input or output the data relative to external equipment, wherein said operation processing means carries out an exposure control calculation for an individual person relying upon the output signals from said radioactive radiation detector and upon read signals from said storage means, wherein said storage means further stores data for confirming an individual person.

2. An intensitometer according to claim 1, wherein said intensitometer is equipped with at least a data display unit, said operation processing means comprises a counter and a microprocessor, the output signals of said radioactive radiation detector are counted by said counter as an integrated quantity of exposure, and a result of the counting by said counter is received by said microprocessor and is displayed on said data display unit.

3. An intensitometer according to claim 1, wherein said storage means is detachably fitted to the body of the intensitometer.

4. An intensitometer according to claim 1, wherein said operation processing means calibrates a conversion constant between a radioactive radiation counting and a space dosage using a conversion constant between the radioactive radiation counting and the space dosage calibrated at a previous time and stored in said storage means, and inspects the acceptability thereof, and said storage means stores a result of the calibration by said operation processing means.

5. An intensitometer according to claim 4, wherein said operation processing means calibrates a conversion constant between a radioactive radiation counting and a space dosage in response to being placed in a field having a space dosage factor.

6. An intensitometer according to claim 1 wherein said exposure control calculation is carried out by said operation processing means in real time based on the output signals from the radioactive radiation detector, said exposure history data and said exposure control values stored in said storage means.

7. An intensitometer capable of being carried by hand which comprises on a piece of card substrate:

a semiconductor radioactive radiation detecting unit;

a memory unit for storing data of an exposure history of an individual person, an exposure control value, and individual person identifying data;

an operation processing unit which performs an exposure control calculation for an individual person relying upon output signals of said radioactive radiation detecting unit and read signals from said memory unit; and

an interface unit which is connected to said memory unit and to said operation processing unit, and which inputs or outputs the data relative to an external unit.

8. An intensitometer according to claim 7, wherein said memory unit is further used for storing a plurality of exposure control values.

9. An intensitometer according to claim 8, wherein said exposure control calculation is carried out by said operation processing unit in real time based on the output signals from the radioactive radiation detecting unit, said exposure history data, and said plurality of exposure control values stored in said memory unit.

10. An intensitometer according to claim 8, wherein said plurality of exposure control values stored in said memory unit include an daily exposure control value, a weekly exposure conrrol value, and a monthly exposure control value.

11. In an apparatus for centralized control of exposure for a plurality of individual persons based on exposure control data of the individual persons in a control center, the improvement comprising a card data reader provided at each of a plurality of entrance/exit gates in a radioactive radiation control section, means for opening and closing the entrance/exit gates based upon individual person confirmation data sent from said card data reader, data circuits that connect said control center to said card data reader, and a card, wherein exposure control data of the individual persons read from the card are transmitted to the control center via the data circuits, and said card is an intensitometer capable of being carried by hand which comprises:

a semiconductor radioactive radiation detector;

storage means for storing data of an exposure history of an individual person, an exposure control value, and individual person confirmation data;

operation processing means for effecting exposure control calculation of the individual persons based upon output signals of said radioactive radiation detector and read signals from said storage means; and

an interface which is connected to said storage means and to said operation processing means to input or output the data relative to an external unit.

12. An intensitometer according to claim 11, wherein said operation processing means comprises a counter and a microprocessor, the output signals of said radioactive radiation detector are counted by said counter as an integrated quantity of exposure, and a result of the counting by said counter is received by said microprocessor.

13. An intensitometer according to claim 11, wherein said storage means is further used for storing a plurality of exposure control values.

14. An intensitometer according to claim 13, wherein said exposure control calculation is effected by said operation processing means in real time based on the output signals form the radioactive radiation detector, said exposure history data, and said plurality of exposure control values stored in said storage means.

15. An apparatus according to claim 13, wherein said exposure control values stored in said storage means include a daily exposure control value, a weekly exposure control value, and a monthly exposure control value.

16. An intensitometer capable of being carried by hand comprising a radioactive radiation detector, operation processing means for digitally processing output signals of said radioactive radiation detector, means for producing a processed result of said operation processing means, storage means for storing exposure control values and exposure history data of an individual person, and an interface which is connected to said storage means and to said operation processing means to input or output the data relative to external equipment, wherein said operation processing means carries out an exposure control calculation for an individual person relying upon the output signals from said radioactive radiation detector and upon read signals from said storage means, wherein said storage means is a non-volatile memory for recording identification codes and a history of exposure dosage of an individual person.

17. An intensitometer capable of being carried by hand comprising a radioactive radiation detector, operation processing means for digitally processing output signals of said radioactive radiation detector, means for producing a processed result of said operation processing means, storage means for storing exposure control values and exposure history data of an individual person, and an interface which is connected to said storage means and to said operation processing means to input or output the data relative to external equipment, wherein said operation processing means carries out an exposure control calculation for an individual person relying upon the output signals form said radioactive radiation detector and upon read signals from said storage means, wherein said exposure control values stored in said storage means include a daily exposure control value, a weekly exposure control value, and a monthly exposure control value.