Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1989-11-03
1991-07-02
Hannaher, Constantine
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
250337, G01T 1105
Patent
active
050287940
ABSTRACT:
M-center luminescence is used to measure radiation. An LiF crystal is excited with a 442 nm He-Cd laser because absorption measurements in LiF indicate the peak of the M-center absorption occurs at 443 nm. Laser stimulation produces an excited state of the M-center, which undergoes a very strong Stokes' shift. The peak of the M-center emission spectrum occurs at 665 nm with a half-width of 0.36 ev. Since the excitation wavelength differs significantly from the emission wavelength, measurement of the deep red emission can be done simultaneously with the excitation. The population of M-centers grows with increasing radiation damage, and therefore M-center lunimescence provides a basis for radiation dosimetry.
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Battelle (Memorial Institute)
Hannaher Constantine
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