TABLE 5

Intrinsic Efficiency of Dose Calibrators for β-Emitters (R_n)

β- Emitter	VEENSTRA VDC-405	Atomlab 100	Isomed 1000/2000	Capintec CRC	Centronic IG12	Capintec β
³²P	0.97	1.05	1.07	1.06	0.97	0.96
⁸⁹Sr	0.83	0.90	0.89	0.91	0.91	0.85
⁹⁰Y	1.59	1.73	2.80	1.71	2.01	1.47
¹⁶⁹Er	0.068	0.078	0.081	0.078	0.024	0.041