Amersham model 6702

Amersham model 6702 Dosimetry Datasets

Note: The following tables are adapted from Rivard et al., Med. Phys. 31, 633-674 (2004).

Table I. NIST standard WAFAC calibration dates for air kerma strength for each manufacturer, and dose rate constant values. Note that for a given source type, the % change in Λ from the 1999 value is different for different seed models.

Manufacturer	Source Type	NIST date used by ADCL and NIST as standard	consensusΛ [cGy -h·^-1·U^-1]	% difference in Λ from 1999 value
Amersham model 6702	¹²⁵I	April 15, 1998	1.036	N/A

Table II.Consensus g(r) values

r[cm]	0.10	0.15	0.25	0.50	0.75	1.00	1.50	2.00
Line source approximation L=3.0 mm	1.020	1.022	1.024	1.030	1.020	1.000	0.935	0.861
Point source approximation	0.673	0.809	0.929	1.008	1.014	1.000	0.939	0.866

r[cm]	3.00	4.00	5.00	6.00	7.00	8.00	9.00	10.00
Line source approximation L=3.0 mm	0.697	0.553	0.425	0.322	0.241	0.179	0.134	0.0979
Point source approximation	0.702	0.557	0.428	0.324	0.243	0.180	0.135	0.0986

Interpolated data are boldface, and italicized data are non-consensus data obtained from candidate datasets.

Table III. F(r,θ)

Polar angleθ (degrees)

		0	5	10	15	20	30	40	50	60	70	80	Φ_an(r)
r [cm]	0.5	0.385	0.413	0.531	0.700	0.788	0.892	0.949	0.977	0.989	0.996	1.000	0.986
	1	0.420	0.472	0.584	0.700	0.789	0.888	0.948	0.973	0.985	0.992	0.998	0.960
	2	0.493	0.546	0.630	0.719	0.793	0.888	0.944	0.967	0.983	0.990	0.998	0.952
	3	0.533	0.586	0.660	0.738	0.805	0.891	0.944	0.967	0.983	0.990	0.998	0.951
	4	0.569	0.613	0.681	0.749	0.810	0.892	0.944	0.967	0.983	0.990	0.998	0.954
	5	0.589	0.631	0.697	0.758	0.814	0.892	0.944	0.967	0.983	0.990	0.998	0.954

Table IV. Dose rates (cGy · h-1 · U-1) as a function of distance for Amersham model 6702 brachytherapy sources using the 1-D dosimetry formalism of Eq. (11) with interpolation for gL(r) and fan(r).

r (cm)	0.5	1.0	1.5	2.0	3.0	4.0	5.0	6.0	7.0
	4.119	0.995	0.413	0.213	0.0768	0.0344	0.0169	0.00890	0.00490