backscatter

Also contains definition of: forward scattering
https://doi.org/10.1351/goldbook.B00581
Scattering
of radiation in a generally backward direction. In the
assay
of
radioactivity
, it applies to the
scattering
of radiation into the
radiation detector
from any material except the sample and the detector. In
light scattering
, it is said to occur when the
scattering angle
, θ, is 180. Conversely, forward scattering occurs when θ is 0.
Sources:
Orange Book, 2nd ed., p. 213 [Terms] [Book]
PAC, 1983, 55, 931. (Definitions, terminology and symbols in colloid and surface chemistry. Part 1.14: Light scattering (Provisional)) on page 932 [Terms] [Paper]