Abstract

Proton-induced degradation of vacuum ultraviolet (VUV) transmittance of LiF and MgF₂ was measured for 85- and 600-MeV protons for a fluence up to 2.8 × 10¹³ p/cm². Transmittances were measured from 105 to 210 nm. When the irradiation level for a given material is expressed in terms of absorbed energy per unit of volume of crystal, 85- and 600-MeV protons produce the same degradation. MgF₂ is substantially more radiation resistant than LiF in the VUV. Irradiation of LiF with 1.8 × 10¹³ p/cm² at 85 MeV changed the transmittance of the hydrogen Lyman-α line at 121.6 nm from 55 to 23%. The corresponding change for MgF₂ was from 52 to 42% for 2.8 × 10¹³ p/cm².

© 1980 Optical Society of America

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