题目内容

A radiographic exposure of the chest was taken at 72 inches using 20 mAs and had an exposure of 100 mR. What would the exposure roughly be at 80 inches under the same exposure parameters?

A. 40
B. 60
C. 80
D. 100

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If one lead apron attenuates 95% of an x-ray beam, two aprons will transmit approximately ____.

A. 5
B. 2.5
C. 1.25
D. 0.25

A grid improves the quality of a diagnostic x-ray primarily by attenuating ___.

A. Primary photons
B. Compton scattered photons
C. Photoelectrons
D. Coherent scattered photons

The quality of a diagnostic x-ray beam is determined by measuring the _____.

A. Peak tube voltage.
B. Effective kV of the beam.
C. The mm of Al filtration added to the beam.
D. The half-value layer in Al.

For 100 KeV X-ray beam, linear attenuation coefficients of aluminum and lead are 0.459and 62.244/cm. What is the thickness of lead in mm equivalent to 15 mm of aluminumin ?

A. 0.01mm
B. 0.11mm
C. 1.1mm
D. 11mm

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