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

Table 3

Structural characteristics of ¹⁹²Ir primary standard cavity chambers for INER, NIST (50cc-1), and NPL.

Laboratory	Graphite density (g cm^−3)	Inside radius (cm)	Outside radius (cm)	Wall thickness (cm)	Cavity volume (cm^3)
INER	1.78	2.899	3.200	0.301	102
NIST	1.73	2.305	2.670	0.365	51.3
NPL	1.75	2.910	3.290	0.380	103