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ABR Part 1: Radiation Physics

Total questions: 20

Worksheet time: 20mins

Name
Class
Date
1.

Convert 8.2 x 102 Bq to mCi

a)

5.9x101 mCi

b)

3.1x10-7 mCi

c)

2.2x10-5 mCi

d)

8.1x10-3 mCi

2.

What is equivalent dose (H)?

a)

A factor which equates dose in Gy to exposure in R

b)

A synonym for absorbed dose to water

c)

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

d)

A measure which represents a tissue's sensitivity to radiation

3.

Which of the following are true of KERMA?

1)     KERMA has units of J/Kg

2)     It is less than absorbed dose beyond dmax

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

4)     KERMA has units of Gy

a)

All are correct

b)

Only 1, 2, and 3 are correct

c)

Only 1, 3, and 4 are correct

d)

Only 1 and 4 are correct

4.

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

 

a)

Kerma

b)

Absorbed dose

c)

Linear attenuation coefficient

d)

Stopping power

5.

Select the false statement.

a)

1cGy = 0.1 J/kg

b)

mec2 = 511 MeV

c)

1 Ci = 3.7 x 1010 Bq

d)

ΓIr-192 = 4.69 (R-cm2)/(mCi - hr)

6.

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

a)

2.13Ci/g

b)

0.98Ci/g

c)

3.7Ci/g

d)

0.04Ci/g

7.

Which is true regarding the Roentgen?

a)

It is dependent upon the charge of the incident radiation.

b)

It is dependent upon the velocity of the incident radiation.

c)

It is applicable to photon and particle radiation.

d)

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

8.

What is the SI unit of activity?

a)

Curie

b)

Becquerel

c)

Roentgen

d)

Rad

9.

Select all true statements regarding the unit cGy.

a)

1cGy = 0.01 J/kg

b)

cGy is a unit of absorbed dose

c)

1cGy = 10 rad

d)

cGy = 0.01 R

10.

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

a)

True

b)

False

11.

What is the dose to air given an exposure of 1540mR?

a)

13.5cGy

b)

135cGy

c)

1350cGy

d)

1.35cGy

12.

A Co-60 beam with an incident photon flux of 1010 photons/second is incident on a material with an HVL of 5cm. What is the flux exiting 13cm of the material? Ignore inverse square effects.

a)

1.57 x 108 (photons/second)

b)

0 (photons/second)

c)

2.47 x 102 (photons/second)

d)

1.65 x 109 (photons/second)

13.

What is the dose to air for an exposure of 5.0 R?

a)

4.4 Gy

b)

5.1 cGy

c)

4.2 cGy

d)

4.4 rad

14.

Convert 3Ci to GBq

a)

1.11x102 GBq

b)

1.11x101 GBq

c)

1.11x107 GBq

d)

1.11x10-3 GBq

15.

What quantity has units of photons/cm2?

a)

Flux

b)

Fluence

c)

Linear attenuation coefficient

d)

TERMA

16.

Which unit is a measure of energy?

a)

Coulomb

b)

Rad

c)

Sievert

d)

Electron volt

17.

What particle has the highest radiation weighting factor?

a)

MeV photons

b)

MeV Electrons

c)

keV photons

d)

Thermal neutron

e)

Fast neutrons

18.

What is the common symbol for linear attenuation coefficient?

a)

δ

b)

φ

c)

ψ

d)

μ

19.

What is the term for the rate of kinetic energy lost per unit path length of a particle? 

a)

Stopping power

b)

Mass attenuation coefficient

c)

Linear attenuation coefficient

d)

TERMA

20.

Two isomers vary in terms of _____

a)

Atomic number

b)

Number of electrons

c)

Energy state

d)

Atomic mass

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