Radiation dosimeter
OwnerSam S. Hsuinventor
Life of this patent
Estimating the term…
Abstract
A portable solid-state radiation dosimeter provides either a cumulative reading or time base reading and includes means for generating an alarm condition when preset radiation levels are reached or exceeded. The dosimeter preferably employs a cadmium telluride crystal biased to provide a count signal corresponding to the level of radiation. The circuitry for processing the crystal signal includes a field effect transistor which provides pre-amplification, one or more stages of main amplification including noise threshold setting, and a frequency to voltage converter for essentially counting radiation pulses. One output from the converter may be an alarm signal that is tripped when a predetermined voltage is reached. Also, a digital reading of radiation count may be provided.
Claims2
A solid-state radiation dosimeter comprising;
- a solid-state crystal having the property of generating electrical pulse signals proportional to particle dosage,
- a resistor network coupled to said solid-state crystal for biasing the crystal,
- transistor amplifier means,
- means coupling the crystal signal to the transistor amplifier means,
- first amplifier means coupled from said transistor amplifier means,
- second amplifier means having a signal input and reference input,
- a resistor circuit setting the reference input,
- conductor means coupling the output of the first amplifier means to the signal input of the second amplifier means,
- frequency to voltage converter means comprising a charge section and a comparator section,
- said comparator section having a signal input and reference input,
- an adjustable resistor circuit setting the reference at an adjustable triggering threshold,
- conductor means coupling the output of the charging section to the signal input of the comparator section,
- and means responsive to said comparator means for providing an alarm,
- said adjustable resistor circuit for determining the frequency or number of pulses at which alarm occurs.
Dependencies are inferred from the claim text.