Optical Reflectors for Use in Internal Sample Aqueous Čerenkov Counters

Ove M. Strindehag

Properties such as reflectance, deterioration in water, and deposition of activities are investigated for several types of optical reflectors. Reflectance values for both visible and ultraviolet light are included and the deterioration tests extend up to water temperatures of 150°C. The influence of reflector properties on detector efficiency is also studied. © 1966 The American Institute of Physics.

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Materials
Curve 1
Temperature, K: ~298 Wavelength Range, µm: 0.4260-0.5400 Geometry θ θ' ω': 0° 2π Composition (weight percent), Specifications, and Remarks: Al + 0.5 Mg; anodized; alloyed from aluminum of quality >99.99 Al; substrate finely turned; measured relative to MgO; converted from R (2π, 0°). [Author's designation: Reflector No. III]
Curve 2
Temperature, K: ~298 Wavelength Range, µm: 0.3079-0.5968 Geometry θ θ' ω': 0° 2π Composition (weight percent), Specifications, and Remarks: Above specimen and conditions except converted from R (0°, 2π).
Curve 1
Temperature, K: ~298 Wavelength Range, µm: 0.2568-0.4957 Geometry θ θ' ω': 45° 0° Composition (weight percent), Specifications, and Remarks: Al + 0.5 Mg; anodized; alloyed from aluminum of quality >99.99 Al; substrate finely turned; measured relative to MgO powder; data extracted from smooth curve. [Author's designation: Reflector No. III]
Curve 1
Temperature, K: ~298 Wavelength Range, µm: 0.4260-0.5400 Geometry θ θ': 0° Reported Error, %: 2π Composition (weight percent), Specifications, and Remarks: MgO in B-72 acryloid binder; 30.3 MgO and 69.7 B-72; measured relative to MgO. [Author's designation: Reflector No. VI]
Curve 2
Temperature, K: ~298 Wavelength Range, µm: 0.3024-0.5972 Geometry θ θ': 0° Reported Error, %: 2π Composition (weight percent), Specifications, and Remarks: Above specimen and conditions except converted from R (0°, 2π).
Curve 3
Temperature, K: ~298 Wavelength Range, µm: 0.2565-0.4956 Geometry θ θ': 45° Reported Error, %: 0° Composition (weight percent), Specifications, and Remarks: Curve 13 specimen and conditions except geometry of data is for reflectance factor; data extracted from smooth curve.
Curve 1
Temperature, K: ~298 Wavelength Range, µm: 0.4260-0.5400 Geometry θ' ω': 0° 2π Composition (weight percent), Specifications, and Remarks: Nuclear Enterprise Ltd. 561 on aluminum substrate; measured relative to smoked MgO; converted from R(2π, 0°). [Author's designation: Reflector V]
Curve 2
Temperature, K: ~298 Wavelength Range, µm: 0.3237-0.5949 Geometry θ' ω': 0° 2π Composition (weight percent), Specifications, and Remarks: Above specimen and conditions except measured relative to pressed MgO powder; data extracted from smooth curve; converted from R(0°, 2π).
Curve 3
Temperature, K: ~298 Wavelength Range, µm: 0.4260-0.5400 Geometry θ' ω': 0° 2π Composition (weight percent), Specifications, and Remarks: Curve 1 specimen and conditions except exposed to deionized water at 373 K for 10 hrs.
Curve 4
Temperature, K: ~298 Wavelength Range, µm: 0.3164-0.4935 Geometry θ' ω': 45° 0° Composition (weight percent), Specifications, and Remarks: Nuclear Enterprise Ltd. 561 paint on aluminum substrate; data extracted from smooth curve; measured relative to pressed MgO powder. [Author's designation: Reflector No. V]
Curve 1
Temperature, K: ~298 Wavelength Range, μm: 0.4260-0.5400 Geometry θ' β': 0° Reported Error, %: 2π