Radiation Health and Safety Test Radiation Physics & Principles Flashcards
6 cards from real Radiation Health and Safety Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Radiation Health and Safety Test Radiation Physics & Principles flashcards as text
What does the term 'linear energy transfer' (LET) describe?
Answer: Energy deposited per unit path length in tissue
LET describes the amount of energy deposited by ionizing radiation per unit length of its path through matter, measured in keV/µm.
What is the primary difference between ionizing and non-ionizing radiation?
Answer: Ionizing radiation has enough energy to remove electrons from atoms
Ionizing radiation carries sufficient energy to remove tightly bound electrons from atoms, creating ions; non-ionizing radiation lacks enough energy to ionize atoms.
Which law describes how radiation intensity decreases with distance from a point source?
Answer: Inverse square law
The inverse square law states that radiation intensity is inversely proportional to the square of the distance from the source (I ∝ 1/d²).
What type of radioactive decay results in the emission of a helium-4 nucleus?
Answer: Alpha decay
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.
In radiology, what is the function of filtration added to an X-ray beam?
Answer: Remove low-energy photons that would only contribute to dose without diagnostic value
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.
What is the effective dose equivalent unit used to account for biological effects of different radiation types?
Answer: Sievert (Sv)
The Sievert (Sv) is the SI unit of effective dose, incorporating radiation weighting factors to express biological risk equivalence across different radiation types.