Radiation Health and Safety Test Radiation Health and Safety Test Radiation Physics & Principles 2

Question 1

What does the term 'linear energy transfer' (LET) describe?

Accepted Answer

Energy deposited per unit path length in tissue

Answer

LET describes the amount of energy deposited by ionizing radiation per unit length of its path through matter, measured in keV/µm.

Question 2

What is the primary difference between ionizing and non-ionizing radiation?

Accepted Answer

Ionizing radiation has enough energy to remove electrons from atoms

Answer

Ionizing radiation carries sufficient energy to remove tightly bound electrons from atoms, creating ions; non-ionizing radiation lacks enough energy to ionize atoms.

Question 3

Which law describes how radiation intensity decreases with distance from a point source?

Accepted Answer

Inverse square law

Answer

The inverse square law states that radiation intensity is inversely proportional to the square of the distance from the source (I ∝ 1/d²).

Question 4

What type of radioactive decay results in the emission of a helium-4 nucleus?

Accepted Answer

Alpha decay

Answer

Alpha decay emits an alpha particle, which is a helium-4 nucleus consisting of 2 protons and 2 neutrons, reducing the parent atom's atomic number by 2.

Question 5

In radiology, what is the function of filtration added to an X-ray beam?

Accepted Answer

Remove low-energy photons that would only contribute to dose without diagnostic value

Answer

Added filtration (typically aluminum) removes low-energy X-ray photons that would be absorbed by the patient without contributing to image formation, reducing patient dose.

Radiation Health and Safety Test Practice Test

Radiation Health and Safety Test Practice Test

Radiation Health and Safety Test Radiation Health and Safety Test Radiation Physics & Principles 2