ProblemSet-5-2005 - NE-524 Interaction of radiation with...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: NE-524 Interaction of radiation with Matter Problem Set #5 (Complete by 11/13/2005) 1) A beam of 0.52 MeV electrons pass into a large reservoir of He at 3 atm pressure, 20 oC (electrons are totally absorbed). a) What is the range of the electrons? b) What is the average total radiative loss (eV/electron)? c) What is the total ionization produced in He (ion pairs/electron)? Estimate the rate of energy loss due to ionization of 2 MeV electrons passing through silver in MeV/cm and MeV.g/cm2. What is the stopping power of 600 keV electrons in water? Calculate the range of Y-90 betas (Emax = 2.27 MeV) in bone (=1.9 g/cc). A health physicist finds an unknown contaminant that turns out to be a pure beta emitter. Using a GM tube with a mica window 0.1 mm thick (r=2.7 g/cc), he finds that 1.74 mm of Al stops all betas. If the distance between the sample and the detector was 2 cm, what is the energy of the beta and what is the contaminant? 2) 3) 4) 5) Answers: 1) a) 346 cm, b) 325 eV/electron, c) 12,583 ion pairs / electron 2) 12.9 MeV/cm, 1.23 MeV.cm2/g 3) 2.014 MeV/cm 4) 0.574 cm 5) 1.177 MeV, Bi-210 ...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online