Free ARRT Radiation and Safety Questions and Answers

Question 1

What prevents the helpful x-ray beams from exposing people to unwanted radiation when imaging certain bodily parts?

Accepted Answer

Collimation

Answer

By limiting the relevant x-ray beam to the area of the body being examined, collimation protects nearby tissue from needless radiation.

Glass barriers and lead shielding are examples of protective barriers. These are not employed while limiting the beam of x-rays. The process of filtering involves using metal filters to capture low-energy x-rays that are released from the x-ray tube. It has no effect on the x-ray beam's restriction. The anatomy being scanned determines the cassette size. The x-ray beam cannot be restricted by it.

Question 2

Which target interaction results from a cathode electron decelerating?

Accepted Answer

Bremsstrahlung

Answer

Also referred to as "braking" radiation, bremsstrahlung radiation is produced when an incident cathode electron changes course and slows down as it approaches a target atom's nucleus. Target contact brought on by the withdrawal of an inner shell electron from the target is known as characteristic radiation. Compton scattering generates scattered radiation through an interaction with matter rather than the target. An interaction with matter that doesn't result in ionization is called coherent scattering. It is not a target interaction, but rather a photon interaction with matter.

Question 3

Which radiation-induced biological consequences happen at random?

Accepted Answer

Stochastic

Answer

Radiation effects with no threshold dose that happen at random are known as stochastic effects. Radiation's main stochastic biological impacts include carcinogenesis and genetic effects. Birth mutations brought on by the fetus's direct radiation exposure are referred to as teratogenesis. After a significant radiation dose, below which the disorder does not show, acute radiation syndrome (ARS) occurs. Hematopoietic, gastrointestinal, and central nervous system responses are the three categories under which ARS falls. These are not haphazard reactions to radiation. Radiation with deterministic effects has a threshold dosage, meaning that no effect will happen below a particular radiation level. They are not arbitrary in any way. One example of a radiation's deterministic effect is cataracts brought on by radiation.

Question 4

What is the radiation dose equivalent unit of measurement?

Accepted Answer

Sievert (Sv)

Answer

Dose equivalent, or Sv, is a measurement that considers both the type of radiation that caused the exposure and the absorbed dose. Gy is used to calculate air karma and the absorbed dose in matter. Exposure is measured in C/kg, commonly in the air. The conventional unit of absorbed dose is the rad.

Question 5

Which of the following will assist in lowering the patient's radiation exposure?

Accepted Answer

Making Use of AEC

Answer

In order to manage patient dosage, proper usage of AEC will guarantee that the right milliampere-seconds (mAs) are employed for the specific body portion. Radiation photoelectric absorption increases with decreasing kVp, adding to the patient's dose. The patient dose will rise exponentially as mAs increases because more photons will be produced in the primary beam. Radiographic grids improve image quality, but they also increase patient dose since more mAs must be used to make up for the grid.

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT - American Registry of Radiologic Technologists Practice Test

Free ARRT Radiation and Safety Questions and Answers