RADT 1065 Unit VI

What is the single largest source of natural background radiation?

• Medical and dental x-rays

• Delta rays

• Radon gas

• Cosmic rays

The greatest source of human-made radiation exposure is from:

• consumer products.

• diagnostic imaging procedures.

• nuclear weapons testing.

• high-altitude flight.

How does the energy of a scattered photon compare with that of the incident photon?

• Less

• Greater

• Equal to

• It has no energy.

What is used to modify the absorbed dose amount to account for the greater damage inflicted by some forms of ionizing radiation?

• Linear energy transfer

• Relative biologic effectiveness

• Radiation weighting factor

• Quantum mottle

What is the unit of air kerma or radiation exposure?

• Becquerel

• Gray_t

• Gray_a

• Sievert

Medical and dental x-rays are examples of:

• natural background radiation

• human-produced radiation

• non-ionizing radiation

• ionizing, natural background radiation

With regard to the ALARA principle, the responsibility of the radiographer is to:

• work as quickly as possible.

• keep radiation exposure as low as possible.

• make decisions about exam appropriateness when it comes to radiation dose.

• talk each patient out of having their exam done.

Any given dose of radiation has a greater potential for damaging tissues that:

• are the most mature.

• have the largest cells.

• have more rapidly dividing cells.

• contain cells with the lowest water content.

The photon interaction that results in the highest patient exposure is _____ interactions.

• photoelectric

• bremsstrahlung

• classical scattering

• Compton

The radiographic beam should be collimated so that it is _____ the image receptor to cut down on patient dose.

• twice as large as

• four times the size of

• no larger than

• slightly larger than