STUDY GUIDE 7, SELF TEST 3
© Department of Physics, University of Guelph
1. The count rate 300 cm from a radioactive source is 900 C/min. The detector is moved so that the count rate is 600 C/min. How far is the detector from the source?
2. It is discovered experimentally that all the γ s from a particular source are just absorbed by 5.0 mm of copper (density 9.00 gm/cm3). Would 9.0 cm of zircon (density 4.70 gm/cm3) absorb all the γ s from this source?