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6 6.1 NaI 1. Cs-137 (0.662MeV) 2. Co-60 1.173MeV 1.333MeV 3. 1.253MeV (Z-) 4. 1.253MeV 2 6.2 Ge Ge NaI 1.253MeV 6.3 20 1 1.253MeV 3 3 5mm AlAl 5cm W (33.97eV/pair) 1 (Coulomb/source)1:602 10 ;19 C/e 16