This document summarizes thickness and radiation length for materials crossed by incident and scattered electrons for Hall-A Polarized He experiments. Information listed here can be used for radiation effect caused by internal and external bremsstrahlung, and energy losses due to ionization for incident and scattered particles.
material | ![]() ![]() |
(cm) | density |
air | 36.66 | 30420 | 1.205 g/l ![]() |
![]() |
94.32 | 755164 | 0.1249 g/l |
![]() |
67.42 | - | |
Be | 65.19 | 35.28 | 1.848 g/cm![]() |
Al | 24.01 | 8.9 | 2.70 g/cm![]() |
Kapton | 40.56 | 28.6 | 1.42 g/cm![]() |
Ti | 16.17 | 3.56 | 4.54 g/cm![]() |
glass | 19.5 | 7.04 | use GE180, 2.77 g/cm![]() |
a. 1 mil=2.54
cm
b. depends on cell geometry
c. depends on target chamber density in beam, 1 amg=1.25
g/cm
d. depends on cell geometry
e. for E94010 it was 10 mil
f. density for gases are evaluated at 20 C, 1 atm