RADD 2501 Lab Experiment 2 - completed Exposure Time...

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EXPERIMENT #2 TIME / DENSITY Using the phantom and a 10 x 12 cassette, follow the steps to take three different exposures on the same film. PURPOSE: To prove the effect of increasing exposure time on radiographic density. The factor that will be changed in each of the three exposures is exposure time. INSTRUCTIONS : Collimate to 1/3 of a 10 x 12” cassette and use the rubberized lead to shield the remaining 2/3. Center the central ray to the center of the film space, THEN center the phantom to the central ray. (prepare the place before you put the part in it) Take the first exposure with the factors listed below. You will continue to collimate to 1/3 of the film and take exposures until all of the factors are
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Unformatted text preview: completed. Exposure Time Milliamperage mAs Kilovoltage SID 1. 0.005 150 mA 0.8 50 40 2. 0.010 150 mA 1.5 50 40 3. 0.015 150 mA 2.3 50 40 Process the radiograph. Place the radiograph on a viewbox and answer the following questions . 1. What happens to the number of electrons produced when exposure time is increased? 2. What happens to the number of x-rays produced when exposure time is increased? 3. How is radiographic density related to exposure time? 4. Did the mAs change when exposure time changes? Why? 5. How is radiographic density related to mAs? 7...
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