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Model 90100
Operators Manual
A-2
Recommended build-up for photons is given in Table A-1; recommended build-up for electrons is given in
Table A-2. Table A-2 takes into account the 0.56 cm water-equivalent inherent in the 35300A Detector.
Cobalt-60 radiation does not require any added build-up.
Table A-1. Recommended Amount of Build-up to Use With the Model 35300A Detector to
Attain Photons d
max
for Linear Accelerators
Nominal
Accelerator Potential,
MeV
Number of build-up
plates
(37051C-1)
"Solid Water"
thickness (cm)
2 0 0
3 1 0.5
4 2 0.5
5 2 1.0
6 3 1.0
7 3 1.5
8 3 1.5
9 4 1.5
10 4 2.0
11 4 2.0
12 4 2.0
13 5 2.0
14 5 2.5
15 5 2.5
16 6 2.5
17 6 3.0
18 6 3.0
19 6 3.0
20 7 3.0
21 7 3.5
22 7 3.5
23 7 3.5
24 8 4.0
25 8 4.0