X-Ray Certification Radiation Physics and Protection 3

Question 1

What happens to X-ray beam intensity as the distance from the source doubles?

Accepted Answer

It decreases to one-quarter

Answer

It doubles

Answer

It remains the same

Answer

It decreases by half

Question 2

Which type of ionizing radiation consists of two protons and two neutrons?

Accepted Answer

Alpha particle

Answer

Beta particle

Answer

Gamma ray

Answer

X-ray photon

Question 3

Lead aprons used in radiography protect against radiation primarily by which interaction?

Accepted Answer

Photoelectric effect

Answer

Compton scattering

Answer

Pair production

Answer

Coherent scattering

Question 4

What is bremsstrahlung radiation?

Accepted Answer

X-rays produced when electrons are decelerated near a nucleus

Answer

Radiation emitted when nuclei undergo radioactive decay

Answer

Scatter radiation from Compton interactions

Answer

Characteristic radiation from inner-shell electron transitions

Question 5

What is the annual occupational whole-body effective dose limit recommended by NCRP?

Accepted Answer

50 mSv

Answer

10 mSv

Answer

100 mSv

Answer

150 mSv

Question 6

Which property of X-rays allows them to penetrate soft tissue but be attenuated by bone?

Accepted Answer

X-ray attenuation increases with tissue atomic number and density

Answer

X-rays travel at the speed of light

Answer

X-rays have no charge

Answer

X-rays are part of the electromagnetic spectrum

Question 7

A dosimeter reading of 2 mGy represents which of the following?

Accepted Answer

2 millijoules of energy per kilogram of tissue

Answer

2 millijoules of energy per gram of tissue

Answer

2 joules of energy per gram of tissue

Answer

2 joules of energy per kilogram of tissue