Table 5.

Background measurement results of different energy γ-ray.

Radionuclide	Energy (keV)	Region of interest (keV)	Count	Count rate (cps)
132Te	228	[226.0, 230.0]	222,187	2.57
131I	364	[361.9, 366.1]	81,725	0.95
133I	530	[527.8, 532.2]	41,771	0.48
137Cs	662	[659.7, 664.3]	34,369	0.40
60Co	1173	[1170.3, 1175.7]	17,166	0.20
60Co	1332	[1329.2, 1334.8]	9358	0.11
124Sb	1691	[1687.9, 1694.1]	3445	0.04