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

Table 2

Comparison of 𝑘_wall values calculated by INER and NIST for NIST’s spherical graphite primary standard chambers using 0.40 MeV, 0.662 MeV, and 1.25 MeV photons.

Chamber	𝑘wall (0.40 MeV)			𝑘wall (0.662 MeV)			𝑘wall (1.25 MeV)
	NIST	INER	Difference	NIST	INER	Difference	NIST	INER	Difference
1cc	1.0312	1.0320	0.07%	1.0286	1.0287	0.01%	1.0197	1.0287	0.01%
10cc	1.0349	1.0352	0.03%	1.0314	1.0319	0.05%	1.0226	1.0319	0.05%
30cc	1.0374	1.0395	0.20%	1.0348	1.0344	−0.04%	1.0249	1.0344	−0.04%
50cc-1	1.0386	1.0402	0.16%	1.0349	1.0354	0.05%	1.0252	1.0354	0.05%