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WorksheetsIMPCB - Basic Radiation Physics
Total questions: 20
Worksheet time: 20mins
1. What is the primary decay mode of Co-60?
Gamma emission
Beta -
Electron capture
Alpha decay
1. What is the energy of a photon with a frequency of 600MHz?
0.5 x 10-6 MeV
2.5 x 10-12 MeV
3.7 x 10-9 MeV
5.11 x 10-1 MeV
A 6MeV photon back-scatters off of an electron. What fraction of its original energy does the photon retain after this scattering event?
19%
11%
1%
4%
Which element has the highest Compton mass attenuation coefficient?
Lead
Boron
Hydroge
Oxygen
What is the minimum energy at which pair production is the most probable photon interaction in water?
30MeV
100MeV
1.022MeV
18MeV
Which of the following types of radiation carry the same charge? (Select all that apply)
Beta+ - rays and Alpha - rays
X-rays and Gamma-rays
Beta+ - rays and Protons
Beta- - rays and Delta - rays
A 3MeV photon undergoes a 30 degree Compton scattering event with an electron in air. How many ion pair will the electron produce?
39000
7801000
9421000
487000
The probability of pair production is proportional to
Zln(E)
(Z/E)^3
EZ
1/Z
A 10MeV proton traveling through water looses energy at a known rate. What energy would an electron need to have in order to loose energy at the same rate in water as the proton?
5.4keV
511keV
0.054MeV
0.511keV
Bremsstrahlung results in the emission of what type of radiation?
Alpha-rays
Gamma-rays
X-rays
Beta-rays
True or false: Beta+ decay is an isobaric process.
True
False
Select all interactions of electrons traveling through a medium
Elastic Collisions with nuclei
Coherent scattering
Elastic collisions with atomic electrons
Bremsstrahlung
Select all true statements.
Photoelectric interactions occur mostly at high energies
Compton scattering probability is independent of atomic number (Z)
Compton interactions involve "free electrons"
Pair production requires energy in excess of 0.511MeV
By about how much does a Co-60 source output reduce in 1 month?
0.1%
2%
5%
1%
What is the decay constant of an isotope that decays to 25% of its initial activity in 1 hour?
2.323 hours-1
1.081 hours-1
1.386 hours-1
1.679 hours-
True or False: The daughter of beta- decay is an isobar.
True
False
Find the cumulative activity of 25 I-125 seeds with an initial activity of 0.5mCi/seed.
51,300 mCi-hr
25,700 mCi-hr
1,100 mCi-hr
9,600 mCi-hr
The decay constant of a certain isotope is 0.0004/second. What fraction of its initial activity decays over 1 hour?
59%
13%
26%
76%
What type of equilibrium is present with a daughter's half life is much less than a parent?
Transient equilibrium
Transitional equilibrium
Charges particle equilibrium
Secular equilibrium
Approximately how many half-lives are required to reduce activity by 99%?
7 half lives
6.6 half lives
5 half lives
50 half lives
