Narrow-band optical absorption filter

Compositions – Radioactive compositions – Nuclear reactor fuel

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350311, 252584, 252587, G02B 522

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active

048848557

ABSTRACT:
A narrow-band filter for absorbing radiation at a wavelength in the range of 9.2 to 10.8 microns and for transmitting radiation in a surrounding 8 to 12 micron band having a high transmission ratio. The filter is comprised of a pure or mixed alkali-halide crystal having optical incidence and transmission surfaces and thiocyanate or borofluoride as an impurity.

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