Troxler 3241 Series - Figure 11. Effect of Distance on Exposure

Model 3241 Series
Appendix A-9
source
Figure 11. Effect of Distance on Exposure
SHIELDING
Shielding is any material used to reduce the radiation reaching
the user from a radioactive source. While some types of
radiation such as alpha particles may be stopped by a single
sheet of paper, other particles such as neutrons and photons
require much more shielding. Materials containing large
amounts of hydrogen, such as polyethylene, are used to shield
neutrons. Dense materials, such as lead, are used to shield
photons. The Model 3241 Series gauges have shielding built into
the system which reduces the exposure.
3 ft.
2 ft.
1 ft.
1 area
4 areas
9 areas