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 10, Problem 10.3P
To determine
The additional shielding required for north and west walls.
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a. 98.9949 Vb. 197.9899 Vc. 70 Vd. 100 mse. 10 Hzf. 20π rad/secg. 125.0876°h. v(t) = 98.9949sin(20πt + 125.0876°)i. -29.0880 Vj. 0.99959°k. 63.643 ms
r(cm)
P(mW)
2.2
15
O. 4
20
25
O. 2
3- Plot agraph between power and distance.
Radiology.
An x-ray tube has an output intensity of 2.6 mR/mAs at 100-cm source-to-image receptor distance (SID) when operated at 70 kVp. What would be the radiation exposure 350-cm from the target?
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- A laser used in eye surgery emits a 3.60-mJ pulse in 1.00 ns, focused to a spot 45.0 µm in diameter on the retina. (a) Find (in SI units) the power per unit area at the retina. (This quantity is called the irradiance.)_________ W/m2(b) What energy is delivered per pulse to an area of molecular size (say, a circular area 0.400 nm in diameter)?___________ Jarrow_forwardThe count rate for a particular a source X is C0 on a detector placed 1 m from the source. When a metal sheet of thickness 5mm is placed between source and counter the count rate drops by 75%. What is the value of the attenuation coefficient, μ, for this radiation and metal? Select one: a. 0.277 mm-1 b. 0.12 mm-1 c. 6.93 mm d. 3.01 mmarrow_forwardنقطتان )2( Q2/(a) For the network below, Find Vo 510 k2 680 k2 77KN 18 k2 22 k2 33 k2 V. V1 20 μν 105.76 μν 211 µV 160.56 µV Oarrow_forward
- 43. (a) Show that the thickness X1/2 of an absorber required to reduce the intensity of a beam of radiation by a factor of 2 is given by X1/2 = 0.693/μ.(b) Find the absorber thickness needed to produce an intensity reduction of a factor of 10.arrow_forwardA limitation on how many spectra per second can be recorded by a time-of-flight mass spectrometer is the time it takes the slowest ion to go from the source to the detector. Suppose we want to scan up to m/z 500 for ions with z = 1. Calculate the speed of this heaviest ion if it is accelerated through 5.00 kV in the source. How long would it take to drift 2.00 m through a spectrometer? At what frequency could you record spectra if a new extraction cycle were begun each time the heaviest ion reached the detector? What would be the frequency if you wanted to scan up to m/z 1000?arrow_forward2*10^20 electrons flows through a cross section of an iron wire of diameter d=5.7mm in time t=13 s. What is the electron drift speed?arrow_forward
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