Amersham model 6711 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 6711	125I	April 15, 1998	0.965	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	1.055	1.078	1.082	1.071	1.042	1.000	0.908	0.814
Point source approximation	0.696	0.853	0.982	1.048	1.036	1.000	0.912	0.819

 

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	0.632	0.496	0.364	0.270	0.199	0.148	0.109	0.0803
Point source approximation	0.636	0.499	0.367	0.272	0.200	0.149	0.110	0.0810

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	20	30	40	50	60	70	80	Φan(r)
r [cm]	0.5	0.333	0.400	0.519	0.716	0.846	0.926	0.972	0.991	0.996	1.000	0.973
	1	0.370	0.429	0.537	0.705	0.834	0.925	0.972	0.991	0.996	1.000	0.944
	2	0.442	0.497	0.580	0.727	0.842	0.926	0.970	0.987	0.996	1.000	0.941
	3	0.488	0.535	0.609	0.743	0.846	0.926	0.969	0.987	0.995	0.999	0.942
	4	0.520	0.561	0.630	0.752	0.848	0.928	0.969	0.987	0.995	0.999	0.943
	5	0.550	0.587	0.645	0.760	0.852	0.928	0.969	0.987	0.995	0.999	0.944

Table IV. Dose rates (cGy · h-1 · U-1) as a function of distance for Amersham model 6711 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
	3.937	0.911	0.368	0.186	0.0643	0.0284	0.0134	0.00688	0.00373