Abstract
A polymer film containing a leuco-phenoxazine color former, 3,7-bis(N,N-diethyl amino)-10-(2,2,2-trichloroethoxycarbonyl)phenoxazine (1) was fabricated for the detection of γ rays. The colorless film containing 1 tinged with blue by γ irradiation. Polymethyl methacrylate (PMMA, 3) film containing 10 wt% of 1 (thickness: 0.8 mm) gave remarkable color change at a dose of 10 Gy. The absorbance change at 644 nm observed in the PMMA film containing 1 after ? irradiation was 3.7 times larger than that at 658 nm in the polystylene (PS, 4) film. The PMMA film was stable at room temperature in a dark place for at least 30 days. Thus, sensitive, thermal-stable, and easy handling γ ray detection system is realized.
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