NaI(Tl) Detector Efficiency Computation Using Radioactive Parallelepiped Sources Based on Efficiency Transfer Principle

Table 5

The point and volume source’s description.

(a)

Point source’s description
PTB-Nuclide	Energy; (keV)	Emission; probability %	Half-life; (days)	Activity (kBq); 1 June 2009	Uncertainty; (kBq)
^241Am	59.52	35.9	157861.05	259.0	±2.6
^133Ba	80.99	34.1	3847.91	275.3	±2.8
^152Eu	121.78	28.4	4943.29	290.0	±4.0
	244.69	7.49
	344.28	26.6
	778.90	12.96
	964.13	14.0
	1408.01	20.87
^137Cs	661.66	85.21	11004.98	385.0	±4.0
^60Co	1173.23	99.90	1925.31	212.1	±1.5
	1332.5	99.98

(b)

Volume source’s description (mm) and activities, 5.05 ± 0.05 kBq
Fisher Scientific Company; Polypropylene (PP) Parallelepiped	Cross section dimensions	Radioactive PTB ^152Eu solution height	Thickness; bottom and side
(125 mL) filled with 100 mL	59.23 × 37.88	51.02	1.50
(250 mL) filled with 200 mL	60.48 × 60.48	61.40	1.52