Fluke Biomedical TNT 12000 - Manual (Page 120)

TNT 12000
Users Manual
D-4
Table D-1. Specifications for IEC 61237 Defined Beam Qualities
kVp
Beam
Quality
First HVL
(mm Al)
Beam
Quality
First HVL
(mm Al)
Beam
Quality
First HVL
(mm Al)
40 RQR 2 1.42 RQA 2 2.2
50 RQR 3 1.78 RQA 3 3.8
60 RQR 4 2.19 RQA 4 5.4
70 RQR 5 2.58 RQA 5 6.8
80 RQR 6 3.01 RQA 6 8.2
90 RQR 7 3.48 RQA 7 9.2
100 RQR 8 3.97 RQA 8 10.1 RQT 8 6.9
120 RQR 9 5.00 RQA 9 11.6 RQT 9 8.4
150 RQR 10 6.57 RQA 10 13.3 RQT 10 10.1
500 – 200 Measurement ranges
Values for ion chambers are calculated using nominal sensitivities: 3.2 x 10 8 R/C.
Table D-2. 500-200 Measurement Ranges
Units Effective Range
[1]
Threshold
Resolution
Step Size
R 10 μ - 9999 250 μ 0.1 μ
R/s 10 μ - 100 250 μ 0.1 μ
R/min 1 m – 6 k 15 m 0.01 m
R/hr 0.1 – 360 k 0.9 0.001
R/pulse [2] 1 m – 1.67 4.17 μ 0.01 μ
Gy 0.1 μ - 876 m 2.19 μ 0.001 μ
Gy/s 0.1 μ - 876 m 2.19 μ 0.001 μ
Gy/min 0.01 m - 52.5 131 μ 0.1 μ
Gy/hr 1 – 3.15 k 7.88 m 0.01m
Gy/pulse
[2]
0.01 μ - 14.6 m 36.5 n 0.1n
[1] IEC 61674 effective range at 1 % resolution steps.
[2] At 60 frames/second (1 to 120 frames/selectable).
Note
Introduction of material, other than free air, behind the Ion Chamber will
cause its response to change due to backscatter.