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ID: 2110678 • Letter: #
Question
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An x-ray tube is powered by a high-voltage supply that delivers
740 W
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the tube. The tube converts 1%
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this power into x rays of wavelength 0.045nm.
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a)
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how many x-ray photons are emitted per
second?
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E = hc/lamda = 6.626e-34*3e8/0.045e-9 = 4.4173e-15 J
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N = (0.01*740)/4.4173e-15 =
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1.6752
x 10^15 photons/second
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b) If a 71
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is accidentally exposed to the full power of the x-ray beam for
1.0s
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what dose equivalent in Sv
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he receive? Assume that the x-ray energy is distributed over the
body, and that 80%
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the energy is absorbed. (Express answer in DOSE EQUIVALENT
please)
Explanation / Answer
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