ABR Part 1: Radiation Physics

Convert 8.2 x 10² Bq to mCi

• 5.9x10¹ mCi

• 3.1x10^-7 mCi

• 2.2x10^-5 mCi

• 8.1x10^-3 mCi

What is equivalent dose (H)?

• A factor which equates dose in Gy to exposure in R

• A synonym for absorbed dose to water

• A measure which represents the stochastic health effect of low levels of ionizing radiation on the human body

• A measure which represents a tissue's sensitivity to radiation

Which of the following are true of KERMA?

1)     KERMA has units of J/Kg

2)     It is less than absorbed dose beyond d_max

3)     Beyond the buildup region, it is greater than absorbed dose

4)     KERMA has units of Gy

• All are correct

• Only 1, 2, and 3 are correct

• Only 1, 3, and 4 are correct

• Only 1 and 4 are correct

What is the term for the energy per unit mass transferred from photons to charged particles?

 

• Kerma

• Absorbed dose

• Linear attenuation coefficient

• Stopping power

Select the false statement.

• 1cGy = 0.1 J/kg

• m_ec² = 511 MeV

• 1 Ci = 3.7 x 10¹⁰ Bq

• Γ_Ir-192 = 4.69 (R-cm²)/(mCi - hr)

The half life of Radium 226 is 1622 years. What is its specific activity?

• 2.13Ci/g

• 0.98Ci/g

• 3.7Ci/g

• 0.04Ci/g

Which is true regarding the Roentgen?

• It is dependent upon the charge of the incident radiation.

• It is dependent upon the velocity of the incident radiation.

• It is applicable to photon and particle radiation.

• It is a measure of the ability of a photon beam to ionize air.

What is the SI unit of activity?

• Curie

• Becquerel

• Roentgen

• Rad

Select all true statements regarding the unit cGy.

• 1cGy = 0.01 J/kg

• cGy is a unit of absorbed dose

• 1cGy = 10 rad

• cGy = 0.01 R

True or false: Kerma is greater than absorbed dose in the buildup region.

• True

• False