Radiology Chapter 4: Radiation Biology Questions
and Answers| Latest Update
Which is the most susceptible to ionizing radiation? Small lymphocyte
The sensitivity of tissues to radiation is determined by: Mitotic activity, cell division, cell
metabolism
Which is considered radioresistant? Mature bone cells
An organ that, if damaged, diminishes the quality of an individual's life is termed: Critical
The traditional unit for measuring x-ray exposure in air is termed: Roentgen
Which radiation unit is determined by the quality factor (QF)? Rem
The unit for measuring the absorption of x-rays is termed: Rad
What is 1 R equal to? 1 R = 2.58 x 10^-4 C/kg
Which traditional unit does not have an SI equivalent? Roentgen
What is the approximate average dose of background radiation received by an individual in the
United States? 300 mrem/3.0 mSv
What is the greatest contributor to artificial radiation exposure? Medical radiation
, The amount of radiation exposure an individual receives varies depending on: Receptor
type, collimation, technique
A single intramural image using digital sensor results in an effective exposure dose on:
0.002 mSv
What is the dose at which leukemia induction is most likely to occur? 5000 mrad (0.05
Gy)
Order of examination types using digital receptors from smallest to largest. 1. Single
periapical/rectangular collimation
2. Single bite-wing/ round collimation
3. Panoramic
4. Complete series/rectangular collimation
5. Complete series/round collimation
Order of annual sources of radiation exposure in the US from smallest to largest. 1.
Consumer products
2. Terrestrial (soil)
3. Cosmic (space)
4. Medical procedures
5. Radon and thoron
Radiation biology The study of the effects of ionizing radiation.
Ionization The production of ions; the process of converting an atom into an ion,
resulting in the formation of a positive atom and a dislodged negative electron.
and Answers| Latest Update
Which is the most susceptible to ionizing radiation? Small lymphocyte
The sensitivity of tissues to radiation is determined by: Mitotic activity, cell division, cell
metabolism
Which is considered radioresistant? Mature bone cells
An organ that, if damaged, diminishes the quality of an individual's life is termed: Critical
The traditional unit for measuring x-ray exposure in air is termed: Roentgen
Which radiation unit is determined by the quality factor (QF)? Rem
The unit for measuring the absorption of x-rays is termed: Rad
What is 1 R equal to? 1 R = 2.58 x 10^-4 C/kg
Which traditional unit does not have an SI equivalent? Roentgen
What is the approximate average dose of background radiation received by an individual in the
United States? 300 mrem/3.0 mSv
What is the greatest contributor to artificial radiation exposure? Medical radiation
, The amount of radiation exposure an individual receives varies depending on: Receptor
type, collimation, technique
A single intramural image using digital sensor results in an effective exposure dose on:
0.002 mSv
What is the dose at which leukemia induction is most likely to occur? 5000 mrad (0.05
Gy)
Order of examination types using digital receptors from smallest to largest. 1. Single
periapical/rectangular collimation
2. Single bite-wing/ round collimation
3. Panoramic
4. Complete series/rectangular collimation
5. Complete series/round collimation
Order of annual sources of radiation exposure in the US from smallest to largest. 1.
Consumer products
2. Terrestrial (soil)
3. Cosmic (space)
4. Medical procedures
5. Radon and thoron
Radiation biology The study of the effects of ionizing radiation.
Ionization The production of ions; the process of converting an atom into an ion,
resulting in the formation of a positive atom and a dislodged negative electron.
