Radiography Exam Radiology Tech 2

Question 1

Which unit is used to measure radiation absorbed dose in SI units?

Accepted Answer

Gray

Answer

The Gray (Gy) is the SI unit of absorbed dose, equal to 1 joule of energy deposited per kilogram of tissue.

Question 2

What is the primary purpose of a grid in radiographic imaging?

Accepted Answer

Reduce scatter radiation reaching the image receptor

Answer

Grids are placed between the patient and image receptor to absorb scattered radiation, improving image contrast.

Question 3

Which of the following describes the ALARA principle?

Accepted Answer

As Low As Reasonably Achievable

Answer

ALARA stands for As Low As Reasonably Achievable, guiding practitioners to minimize radiation exposure while maintaining diagnostic image quality.

Question 4

What does mAs represent in radiographic technique?

Accepted Answer

Milliampere-seconds, a measure of X-ray quantity

Answer

mAs (milliampere-seconds) is the product of tube current (mA) and exposure time (s), determining the total quantity of X-rays produced.

Question 5

Which type of X-ray interaction with matter predominates at diagnostic energy levels in soft tissue?

Accepted Answer

Compton scatter

Answer

Compton scatter is the dominant interaction at typical diagnostic X-ray energies in soft tissue, contributing to image noise and patient dose.

Radiography Exam Practice Test