X-ray Physics Quiz

Grays, or milligrays, in air are the measurement for x-ray ________.

• quantity and intensity

• intensity and exposure

• quantity, exposure and intensity

• intensity and kVp

The number of x-rays in the useful beam defines x-ray ________.

• mAs

• Intensity

• 2

• kVp

Standard x-ray machines produce about ______ μGya/mAs at 70 kVp measured at 100 cm SID.

• 100

• 50

• 20

• 200

X-ray intensity increases in direct proportion to increases in ________.

• mAs

• filtration

• kVp

• distance

If the distance from the source to the image (SID) is reduced by half, how is the x-ray intensity at the image affected?

• It is reduced by 1/4.

• It is increased 4 times.

• it is doubled

• It is reduced by half.

If filter thickness is ________, then x-ray intensity is ________.

• increased; reduced and reduced; increased

• reduced; increased

• increased; reduced

• reduced; reduced

A 10% increase in kVp has ________ effect on x-ray intensity than/as a 10% increase in mAs.

• the same

• less

• much greater

• much less

If the quantity of electrons hitting the target is doubled, the x-ray intensity is __________.

• increased by a factor of two

• reduced by half

• just slightly increased

• increased by a factor of four

If a technologist changes the technique from 70 kVp @ 200 mAs to 70 kVp @ 400 mAs, the x-ray intensity will __________.

• decrease by half

• remain the same

• double

• increase by ¼

If the intensity of a 70 kVp exposure at 20 mAs is 1.0 mGya, what would it be at 5 mAs?

• 0.5 mGya

• 0.25 mGya

• 4.0 mGya

• 2.0 mGya