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Introductory Physics Homework Help
X-ray Tube Output: 80μGy/mAs at 1m, 900µGy/s @1m
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[QUOTE="BobP, post: 5455187, member: 500221"] [h2]Homework Statement [/h2] (The question is in the image attached) (c) An X-ray unit in the cardiac catheter labs has an output of 80µGy/mAs at 1 meter when the unit is set at 100 kVp. After adding 0.3mm Cu to the beam the photon intensity is reduced to a quarter and tends to vary in proportion to kV3 (i.e. kV to the power of 3). What would be the output rate at 80cm from the tube focus for a continuous beam at 80 kV p and 5 mA ? (d) The same unit as in c) is now used for an acquisition run. The protocol uses 15 frames per second with a 10ms pulse width at 100kV without the copper filtration and a 20 x 20cm square field. The detector distance is 1m from the tube. If the measured output rate at 1m is 900 µGy/s what is the peak tube current of each pulse? What DAP reading in cGycm2 would be measured in 10 seconds of acquisition? [h2]Homework Equations[/h2] none relevant [h2]The Attempt at a Solution[/h2] Please can someone confirm if my answers are correct (c) 80 μG/mAs (Working: 20 * (1/0.8)[SUP]2[/SUP] * (80/100)[SUP]3[/SUP] * 5) (d) Current = 750 mA DAP reading = 360 cGycm[SUP]2[/SUP] Thank you [/QUOTE]
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Introductory Physics Homework Help
X-ray Tube Output: 80μGy/mAs at 1m, 900µGy/s @1m
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