a) If the intervening tissue has a thickness of 5 mm, calculate the fraction of the 20- keV intensity absorbed in it. b) What thickness of aluminum filter would reduce the 20-keV radiation exposure by a factor of 10? c) Calculate the reduction in the intensity of 100-keV X rays transmitted by the filter.
a) If the intervening tissue has a thickness of 5 mm, calculate the fraction of the 20- keV intensity absorbed in it. b) What thickness of aluminum filter would reduce the 20-keV radiation exposure by a factor of 10? c) Calculate the reduction in the intensity of 100-keV X rays transmitted by the filter.
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Transcribed Image Text:Q3. A dentist places the window of a 100-kVp (100-kV, peak voltage) X-ray machine
near the face of a patient to obtain an X-ray of the teeth. Without filtration, considerable
low-energy (assume 20 keV) X rays are incident on the skin.
a) If the intervening tissue has a thickness of 5 mm, calculate the fraction of the 20-
keV intensity absorbed in it.
b) What thickness of aluminum filter would reduce the 20-keV radiation exposure
by a factor of 10?
c) Calculate the reduction in the intensity of 100-keV X rays transmitted by the
filter.
Given (Hen/phtisue @ 20 kev= 0.6 cm³/g
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