题目内容
After traveling through two half-value layers, the incident radiation has been reduced to _____.
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For maximum penetration of X-rays, which of the following combinations would you select?
X-rays are most effectively stopped by ______.
When the energy from an x-ray tube has penetrated through 3 half-value layers, only 3/4 of the original energy remains.
The "photoelectric" effect involves complete absorption of the photon.
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