Accession Number : ADD013905

Title :   Dose and Dose Rate Sensor for the Pocket Radiac.

Descriptive Note : Patent Application, Filed 14 Oct 88,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Kronenberg, Stanley

Report Date : 14 Oct 1988

Pagination or Media Count : 17

Abstract : The present invention relates generally to radiation detectors, and more particularly to small gamma ray and neutron dosimeters useful in measuring radiation on the nuclear battlefield. A radiation detector which registers the radiation absorbed during the Prompt Initial Radiation (PIR) phase following the detonation of a battlefield nuclear device is disclosed. The dose and dose rate attributable to gamma rays may be measured when the dose rate is low, and the total dose attributable to neutron and gamma ray radiation can be determined separately when the dose rate is high. Two silicon photodiodes are arranged on opposite sides of a slab of polyethylene to gather protons scattered by the incident neutron flux. A third photodiode is set next to a slab of silicon such that its depleted layer is surrounded by silicon. All three diodes are sensitive to gamma ray radiation. When the dose rate is low, the three diodes gather gamma ray dose information. When the dose rate is high, the two diodes adjacent to the polyethylene register combined neutron and gamma ray dose information while the remaining diode registers predominantly gamma ray dose information. Analog to digital converters are used to change the analog signals from the diodes to digital signals appropriate for a microprocessor. These digital signals can be combined with dose data stored in the microprocessor to determine gamma ray dose rates and neutron and gamma ray doses. Keywords: Patent applications, Radioactive fallout. (aw)

Descriptors :   *DOSIMETERS, *PATENT APPLICATIONS, ANALOG SIGNALS, ANALOG TO DIGITAL CONVERTERS, BATTLEFIELDS, DEPLETION, DETECTORS, DIGITAL SYSTEMS, DIODES, RADIATION DOSAGE, DOSE RATE, FALLOUT, GAMMA RAYS, LAYERS, MEASUREMENT, MICROPROCESSORS, NEUTRON FLUX, NEUTRONS, NUCLEAR WARFARE, NUCLEAR WEAPONS, PHOTODIODES, POLYETHYLENE, PROTONS, RADIATION, RADIATION MEASURING INSTRUMENTS, RADIOACTIVE MATERIALS, REGISTERS(CIRCUITS), SIGNALS, SILICON, RADIATION ABSORPTION

Subject Categories : Radiobiology
      Nuclear Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE