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Appendix
Using Build-Up
A
A-3
Table A-2. Recommended Amount of Build-up to Use With the Model 35300A Detector to
Attain Electrons d
max
for Linear Accelerators. 37051C-1 Plates are 0.44 cm Each
Nominal
Accelerator Potential,
MeV
Number of build-up
plates
(37051C-1)
"Solid Water"
thickness (cm)
2 1 0.5
3 1 0.5
4 1 0.5
5 2 1.0
6 2 1.0
7 3 1.5
8 3 1.5
9 4 2.0
10 5 2.0
11 5 2.5
12 6 3.0
13 6 3.0
14 7 3.5
15 7 3.5
16 8 4.0
17 8 4.0
18 9 4.5
19 10 4.5
20 10 5.0
21 11 5.5
22 11 5.5
23 12 6.0
24 12 6.0
25 13 6.0
The amount of underside build-up to be used depends on how closely you wish to approximate the back-
scattering of a water bath or other test set-up. Generally, several inches are used: about eight 37051C-1
plates (or about 4.0 cm of "Solid Water") regardless of the incident energy shown in the tables.