Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1988-02-04
1989-08-22
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
G01T 102, G01T 124
Patent
active
048598534
ABSTRACT:
A solid state gamma ray dosimeter which measures radiation in terms of absorption in a material different from the detector material. A solid state detector, an amplifier, an analog-to-digital interface and a microprocessor are combined in circuit to correct for differences between absorption of radiation in detector material and absorption in other materials, especially tissue. A suitable cladding may surround the detector. A method of generating dose translation data for calibrating the microprocessor is also disclosed. The solid state detector is attached to a multichannel analyzer circuit and subject to known doses of various monochromatic gamma rays. Output pulses from the detector are amplified and introduced into the multichannel analyzer. The spectrum produced is used to determine an average channel number (or pulse height) for a given dose of monochromatic radiation. The given dose is in units specific to material different from the detector material. The partial dose represented by a single detector pulse at that energy is computed. Partial doses for other energies are likewise computed. Dose translation data associates a partial dose with a given detector pulse height. Dose translation data is set in the microprocessor of the dosimeter. Such dose translation data can be used to calculate total dose and dose rate in units peculiar to material other than detector material.
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Drew James J.
Fields Carolyn E.
The United States of America as represented by the Secretary of
Zelenka Michael J.
LandOfFree
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