A study of radiation tolerance in optical cements

Abstract

We study the effect ionizing radiation has on light transmission in the wavelength range 190–1100 nm for a number of optically clear epoxies. We find that the transmittance of traditional, commercially available, optical epoxies show significant degradation for exposures of 1×1012 MIPs/cm2. Degradation of light transmission progresses from the shortest wavelengths at low doses to longer wavelengths as the dose increases. In epoxy joints that are 0.1 mm thick, we observe that more than 5% of the light is lost for wavelengths less than 400 nm for traditional optical epoxies. Our studies have identified an optically clear epoxy that shows little degradation for radiation exposures up to 5.9× 1014 MIPs/cm2 (≈ 220 kGy).

Simulation study of the light collection efficiency and the dependency on position resolution in plastic scintillator-based muography detectors

“…Correspondingly, the reflectivity of PTFE is approximately 0.99 [28] at this wavelength. The WLS fibers (BCF-92 [27]) are glued inside the drilled grooves by optical cements (BC-600 [25]) in scintillators. As shown in figure 1(a), the BCF-92 fiber is a double-clad WLS fiber which has an enhancement of light transport efficiency compared with other single-clad model types.…”