Light emitting diode reference locket

Details Light emitting diode reference locket Light emitting diode reference locket

1995-06-23

1996-10-22

Hannaher, Constantine

Radiant energy

Calibration or standardization methods

25037005, 25037007, 25039003, 250392, 2504845, 2504741, G01D 1800, G12B 1300, G01T 308

Patent

active

055679366

ABSTRACT:
A reference locket for use in calibrating a radiac computer indicator or trument having a light emitting diode or LED. The present invention is an inexpensive stable device having a base, a retainer placed in the base holding a light emitting diode or LED, and a cover forming a reference locket. The reference locket is placed in a radiac computer indicator or instrument for calibration. A forward constant current pulse provided to the LED results in electromagnetic radiation or light that simulates a gamma dose. The characteristic junction resistance of the LED simulates a neutron reading. The present invention replaces a conventional reference locket having a silver activated phosphate glass and a neutron diode. The phosphate glass blocks have exhibited unexplained increases in the previously calibrated gamma doses. Therefore, calibration or reference lockets using phosphate glass may be unstable. The present invention provides a stable, inexpensive reference locket used for calibration of a radiac computer indicator or instrument without modification to the existing instrument.

REFERENCES:
patent: 3868511 (1975-02-01), Basso et al.
patent: 4191886 (1980-03-01), Basso et al.
patent: 4544843 (1985-10-01), Kern et al.

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