Introduction To Health Physics
Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 14, Problem 14.24P

(a) How far from a 10-GHZ radar transmitter would the far field be expected to begin if the antenna diameter is 0.6 m?
(b) A power meter, whose calibration at 10 GHz gives -10 dB as the power level that corresponds to 1 mW/cm 2 , is used to measure the power density at the distance calculated in part (a). The meter reading is +3 .5 dB . What is the power density at this point?
(c) At what distance from the antenna will the power density be down to —7 dB?

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