Evaluation of Wall Correction Factor of INER's Air-Kerma Primary Standard Chamber and Dose Variation by Source Displacement for HDR ¹⁹²Ir Brachytherapy

Table 4

Calculation comparison for wall correction factors of the ¹⁹²Ir primary standard chambers for NPL and NIST.

The NPL primary standard chamber for ^192Ir
Wall correction factors calculated by	NPL	INER	Difference
k wall values	1.0453	1.0429	−0.23%
The NIST primary standard chamber (50cc-1) for ^192Ir
Wall correction factors calculated by	NIST	INER	Difference
k wall values	1.0349	1.0395	0.44%