Gamma rays and X-rays are high energy photons. Gamma rays are produced by the nucleus of an atom and are typically in the 50 keV to 10 MeV energy range. X-rays are produced by the electrons around the nucleus and are typically in the 1 to 100 keV range.
The following results are based on calculations of this exponential function for certain values of x for various scintillators. The number of photons absorbed by a certain thickness is the difference I0- I. However, instead of calculating for different I0's, the ratio of (I0- I)/I0 is calculated and it is called the "Percent Absorption."
For example, a NaI crystal of 60mm thickness would absorb 88% of the 500 keV photons incident on its face.
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