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# 1) A material is found to have a tenth-thickness of 2

By Laurie Ramirez,2014-03-18 09:32
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1) A material is found to have a tenth-thickness of 2be,a,of,has,found,have,tenth,Tenth

1) A material is found to have a tenth-thickness of 2.3 cm for 1.25-MeV gamma rays, (a) What is the linear attenuation coefficient for this material? (b) What is the half-thickness? (c) What is the mean-free-path length for 1.25-MeV photons in this material?

2;The specific rate of energy loss (-dE/ρdx) of a 5 MeV

-12proton in silicon is 59 keV mg cm and its range R' is 50 mg

-2cm . Calculate values of (-dE/ρdx) and range R' for deuterons,

tritons, 3He and a particles, all of which have the same speed as the proton.

18 23;A pulse of 10100 keV X-ray photons per m is directed at

right angles on to a 5 mm thick slab of iron. Calculate the

-3temperature increase of the slab. Density of iron = 7870kg m

mass attenuation coefficient for l00 keV photons on iron = 0.04 2-1-1-1m kg; specific heat capacity of iron = 106 J kgK .

4) During a diagnostic X-ray, a broken leg with a mass of 5 kg receives an equivalent dose of 0.5 mSv. If the X-ray energy is 50 keV, how many X-ray photons were absorbed?

5) If a radionuclide, with a physical half-life t, is ingested and 1/2

behas a biological half-life t. What is the effective half-life t, 1/21/2

for the removal of the radioactive nuclide from the system?

6) What is the gamma-ray absorbed dose rate (Gy/h) in an infinite air medium at a distance of 10 cm from a 1 mCi point

13source of N? Decay data and energies can be found at this site: http://www.nndc.bnl.gov/mird/

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