1. Sep 19, 2009

### marchhansen

1. The problem statement, all variables and given/known data

1. What is (Kc)air in Gy at a point in air where X = 47 roentgens?

2. An electron enters a volume V with a kinetic energy of 4 MeV and carries 0.5 MeV of that energy out of V when it leaves. While in the volume it produces a bremsstrahlung x-ray of 1.5 MeV which escapes from V. What is the contribution of this event to:

a. The energy transferred?
b. The net energy transferred?
c. The energy imparted?

3. A plane-parallel monoenergetic beam of 10^12 uncharged particle per second is incident perpendicularly on a layer of material 0.02 m thick, having a density ρ = 11.3 x 10^3 kg/m3. For values of the mass attenuation coefficient μ/ρ = 1 x 10^-3, 3 x 10^-4, and 1 x 10^-4 m2/kg, calculate the number of primary particles transmitted in 1 minute. Compare in each case with the approximation; Give the percentage errors.

2. Relevant equations

Totally no idea

3. The attempt at a solution

Please give me a hint on how to work on these. These are representative problems, I will work on many similar problems based on the answer to this one. Please explain in detail. I need to understand it more than to answer it.

1. [0.412 Gy]

2.
a. [0]
b. [0]
c. [2.0 MeV]

3. [4.786 x 1013, 5.607 x 1013 , 5.866 x 1013; 4.644 x 1013 , 5.93 x 1013 , 5.8644 x 1013; 3%, 0.25%, 0.03%]

Last edited: Sep 19, 2009