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A second coaxial Ge detector (p-type), crystal size 155 cc, resolution (FWHM) 1.9 keV at 1.33 MeV ( 60 Co) and 900 eV at 122 keV ( 57 Co), peak-to-Compton ratio 55:1 and efficiency 42 %, was appropriate for -rays ranging from 240 to 2614 keV for determination of 226 Ra via its decay products 214 Pb and 214 Bi, 232 Th via its decay products 228 Th, 228 Ac and 228 Ra, 40 K (1460 keV), 137 Cs (662 keV) and 134 Cs (605 keV)

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