This paper describes the construction and calibration of a complete optical system, built entirely within a standard helium cryostat, for making absolute measurements of radiation‐induced luminescence and optical absorption in the infrared range out to 25 μ. Helium cooling the entire optical system reduced the thermal background radiation at the detector to approximately 1 × 109 photons/cm2‐sec (λ<25 μ). Although helium Dewars for radiation effects have been described previously, to our knowledge no similar instrument for measuring radiation‐induced optical effects has been reported.
REFERENCES
1.
D. Curie, Luminescence in Crystals (Wiley, New York, 1963).
2.
A Minnesota Valley Engineering cryostat (model HLDT‐5) was used for this construction.
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B. C. Passenheim, R. A. Cesena, and T. M. Flanagan, presentation at IEEE Nuclear and Space Radiation Effects Conference, Seattle, WA (1972).
10.
Atomex immersion gold solution, Baker & Co., Inc.
11.
Handbook of Chemistry and Physics, Chemical Rubber Publishing Co. (mass absorption coefficient tables).
12.
Nextel Velvet coating, 101‐C10 (Black Velvet), 3M Company.
13.
14.
Calibrated detector loaned to us by W. L. Eisenman, Naval Electronics Laboratory Center, San Diego, CA.
15.
Model SE5653 from Spectronic OptoElectronic Components, operated at helium temperature;
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© 1974 The American Institute of Physics.
1974
The American Institute of Physics
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