NRRPT Radiation Fundamentals & Detection 2

Question 1

Which interaction mechanism is responsible for most of the ionization produced by alpha particles in tissue?

Accepted Answer

Coulombic interactions with orbital electrons

Answer

Photoelectric effect

Answer

Nuclear collisions

Answer

Pair production

Question 2

A Geiger-Müller tube operating in the Geiger region produces output pulses that are:

Accepted Answer

Independent of the energy of the incident radiation

Answer

Proportional to the initial ion pairs created

Answer

Larger for alpha particles than for beta particles

Answer

Dependent on the applied voltage within the plateau

Question 3

The Q-value of a nuclear reaction is defined as:

Accepted Answer

The total kinetic energy of the products minus that of the reactants

Answer

The binding energy per nucleon of the product nucleus

Answer

The difference in atomic mass numbers between reactants and products

Answer

The threshold energy required to initiate the reaction

Question 4

Which property of a scintillation detector makes it superior to a GM tube for gamma spectroscopy?

Accepted Answer

Pulse amplitude proportional to photon energy

Answer

Higher operating voltage

Answer

Ability to detect alpha particles

Answer

Insensitivity to neutrons

Question 5

Thermoluminescent dosimeters (TLDs) measure dose by:

Accepted Answer

Measuring charge released when heated crystals luminesce

Answer

Counting ion pairs produced in a gas cavity

Answer

Reading the optical density of darkened crystals

Answer

Detecting current flow through a semiconductor junction

Question 6

The specific ionization of a charged particle in matter generally increases as the particle:

Accepted Answer

Slows down near the end of its range

Answer

Gains kinetic energy

Answer

Increases in mass at constant velocity

Answer

Moves from high-density to low-density material

Question 7

Which of the following nuclides undergoes electron capture (EC) decay?

Accepted Answer

Iron-55

Answer

Carbon-14

Answer

Strontium-90

Answer

Cobalt-60