Gamma absorption

Question 1

Find the linear attenuation coefficient

Answer 1

• make a graph, exponential fit
• show R^2 and equation
• pulse count as y-axis, thickness as x-axis
• power of equation is the answer
• answer in 1/cm

Question 2

Find the mass attenuation coefficient

Answer 2

linear attenuatiion coefficient/ density

*answer in cm^2/g

Question 3

Calculate the half value layer

Answer 3

d = ln2 / linear attenuation coeff

*answer in cm

Question 4

Estimate the photo energy if absorbing material was lead

Answer 4

use COMPONENTS OF THE MASS ATTENUATION COEFFICIENT OF LEAD graph

• answer is MeV at found mass att. coeff. in part 2