超星 - 专业英语自测

单选题

There are four types of radiation-matter interactions that can contribute to the total attenuation. These are ______.

A. Compton scattering, pair production, photoelectric absorption, rayleigh scattering
B. Compton scattering, electron exchange, photoelectric absorption, rayleigh scattering
C. Electron exchange, pair production, photoelectric absorption, rayleigh scattering
D. None of the above

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单选题

After traveling through two half-value layers, the incident radiation has been reduced to _____.

A. 50%
B. 35%
C. 20%
D. None of the above

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单选题

For maximum penetration of X-rays, which of the following combinations would you select?

A. 90 kvp and 10 ma
B. 65 kvp and 10 ma
C. 70 kvp and 90 ma
D. 10 kvp and 65 ma

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单选题

X-rays are most effectively stopped by ______.

A. Copper
B. Glass
C. Lead
D. Tungsten

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单选题

When the energy from an x-ray tube has penetrated through 3 half-value layers, only 3/4 of the original energy remains.

A. True
B. False

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单选题

The "photoelectric" effect involves complete absorption of the photon.

A. True
B. False

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单选题

After Compton scattering, the scattered x-ray has_______.

A. Higher energy
B. Higher velocity
C. Less mass
D. Longer wavelength

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单选题

The intensity of an x-ray beam passing through a patient______.

A. increases linearly
B. decreases linearly
C. decreases quadratically
D. decreases exponentially

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单选题

In an x-ray machine with a tungsten target, increasing the kVp from 100 to 150 will increase all of the following except:

A. The energy of the characteristic x-rays.
B. The average energy of the spectrum.
C. The maximum energy of the x-rays.
D. The total number of x-rays emitted.

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单选题

Primary function of the X-ray tube system is to convert _____?

A. electromagnetic energy to electric energy
B. electric energy to thermal energy
C. electric energy to X-rays
D. electromagnetic energy to X-rays

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