Solid state counting system for high energy beta and gamma decay

Details Solid state counting system for high energy beta and gamma decay Solid state counting system for high energy beta and gamma decay

1985-04-23

1987-07-21

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Semiconductor system

250328, G01T 124

Patent

active

046820353

ABSTRACT:
The disclosure relates to a method and apparatus for quantitatively evaluating radiation emissions of radiolabeled laboratory samples. These radiation emissions frequently include high energy beta and gamma radiation emissions resulting from .sup.32 P isotope decay. High energy beta and gamma radiation is detected by a solid state PIN photodiode and analyzed by a microprocessor to provide an indication of a radiation emission characteristic such as activity expressed in disintegrations per minute (DPM). An indication of sample activity is obtained from a detected sample count rate adjusted by a detector calibration constant which is determined by the microprocessor from a reference radiation emitting sample of known activity and volume. Indications of radiation emission characteristics may be displayed by an alpha-numeric liquid crystal display. Hard copy data may be produced from an expansion module in the form of a printer module adapted to receive data input from the microprocessor. Another expansion module, a high performance liquid chromatography (HPLC) flow detector, provides indications of radiation emissions of a sample flow passing through the flow detector. Radiation emission characteristics obtained from the sample flow may be printed by the printer module or displayed by the alpha-numeric liquid crystal display.

REFERENCES:
patent: 3988587 (1976-10-01), Shreve, Jr. et al.
patent: 4348588 (1982-09-01), Yrjonen et al.
patent: 4536841 (1985-08-01), Waechter et al.

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