noun Physics.
the deflection of nuclear particles or of radiation in a scattering process through an angle greater than 90°.
Also, backscattering.

1955–60; back2 + scatter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
backscatter   (bāk'skāt'ər)  Pronunciation Key 
  1. The deflection of radiation or particles by electromagnetic or nuclear forces through angles greater than 90° to the initial direction of travel.

  2. The radiation or particles so deflected.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Aim your lights correctly to avoid backscatter-out and outward is the best approach.
Backscatter machines are thus many times more dangerous than other sources of ionizing radiation at the same measured dosage.
As radar images represent surface backscatter rather than reflected light, there is no colour in a standard radar image.
X-ray backscatter technology uses a narrow, low intensity x-ray beam, scanned over the body's surface at high speed.
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