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Topic: Science
Number of pages / Number of words: 15 / 4065
Essay's paper body

The rays from a point source form a

divergent beam. The number of photons passing per unit area perpendicular to the

direction of motion of the photons is called the fluence, ?. The fluence in a vacuum

decreases following the inverse square law, given by

?(r)=?(1)?1

r2 (2)

where r is the distance from the point source and ?(1) is the fluence at r=1 (relative

units)...


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The fluence, ?, of X-rays decreases with the square of the distance from the

source.

d. Refraction of X-rays

When visible light passes from one medium to another it is refracted due to the different

velocities of the rays in different media and interference of waves. The velocity of

propagation of X-rays varies much less in different materials and the refraction of X-rays

is negligible...


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