Physics Quantum Physics Photoelectric Effect Photons 510850
Number of Photons.
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3. A 60Co radiation therapy unit is equipped with a 1000 Ci source . The source to skin distance is 100 cm. Estimate how many photons per second are incident on a 1 mm x 1 mm area of skin of a patient. Neglect air attenuation.

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Solution provided by:
Yinon Shafrir, PhD
About Expert

Education BA, Technion, Israel Institute of Technology MSc, Clarkson University, NY PhD, Clarkson University, NY Recent Feedback
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I see where my mistake is .It is the recursion equation
But I am confused when comparing the two different questions at 1.12
Can you offer an explanation or go over how we arrive at the recursion equation as I am questioning that part of my understanding between the two questions
The only thing I can think of is that 1.12 of the older question might have an error in the inclusion of +r
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