Chapter 7 /RADBIO questions

Which of the following is attributed to linear energy transfer?

• It is the same for wave and particulate radiations used in diagnosis and treatment.

• It is the same for all types of radiation.

• It only occurs during x-ray procedures.

• It varies for different types of radiation.

What imaging modality uses the unit of measurement known as the Bq?

• Sonography

• Nuclear medicine

• Direct digital radiography

• Computed radiography

Medical and dental x-rays are examples of:

• human-produced radiation.

• nonionizing radiation.

• natural background radiation.

• ionizing, natural background radiation.

What is the cumulative effective dose limit for a 31-year-old radiographer?

• 31 mSv

• 31 rem

• 31 Gy

• 31 rad

What is the annual effective absorbed dose equivalent limit for the general public (frequent exposure)?

• 0.1 mSv

• 0.01 mSv

• 1 mSv

• 10 mSv

As LET _____, biological damage ____

• decreases;decreases

• increases;decreases

• decreases;increases

• decreases; not effected

When low LET radiations interact with tissues, they cause damage through:

• indirect action

• direct action

• production of free radicals

• RBE

Average energy deposited per unit length of track by ionizing radiation as it passes through & interacts with a medium along its path describes;

• Linear Energy Transfer

• Oxygen Enhancement Ratio

• Relative Biologic Effectiveness

• High Linear Energy Transfer

When LET increases, the chance of a significant biologic response in the radiosensitive DNA macromolecule

• decreases slightly.

• also increases.

• decreases considerably.

• remains constant, not increasing or decreasing.

Direct action may occur after exposure to any type of radiation, but it is much more likely to occur after exposure to

• low-LET radiation such as gamma rays.

• low-LET radiation such as x-rays.

• high-LET radiation such as alpha particles.

• nonionizing radiation such as microwaves.