back scatteringn.
Physics.
The scattering of radiation in a reverse direction from an irradiated substance.
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the world > matter > physics > atomic nucleus > radioactivity > alpha radiation > [noun] > scattering > in reverse direction
backward scattering1938
back scattering1940
back scatter1957
1940 Physical Rev. 57 29/2 (heading) Disregard of back scattering. It is frequently assumed that all electrons are scattered only in the forward direction.
1946 Physical Rev. 70 602 The backscattering of d-d neutrons was investigated for several materials.
1958 New Scientist 2 Jan. 23/1 Heavyweight atoms like those of lead give a bigger ‘backscattering’ than lightweight atoms such as those of aluminium.
1960 Gloss. Atomic Terms (A.E.A.) 5 Back scattering, the emergence of radiation from that surface of a material through which it entered, due to its collision with and reflection from atoms in the material.
Derivatives
back-scatter v. [as a back-formation] (transitive) .
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the world > matter > physics > atomic nucleus > radioactivity > alpha radiation > reflect [verb (transitive)] > scatter > in reverse direction
back-scatter1958
1958 New Scientist 2 Jan. 23/1 The beta ray source is shielded so that only radiation backscattered by the sample can enter the counter.
1962 Gloss. Terms Nucl. Sci. (B.S.I.) 12 Back scatter, the emergence of radiation from that surface of a material through which it entered... The term is also used for the actual back-scattered radiation.
back scatter n. (a) back scattering; (b) the radiation scattered in this way; hence in Telecommunications (see quot. 1960); also attributive.
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society > communication > telecommunication > [noun] > signal > types of
pilot1935
back scatter1957
pilot signal1968
society > communication > telecommunication > radio communications > [adjective] > radar > types of
sideways-looking1832
primary radar1945
shoran1946
passive1954
monopulse1955
back scatter1957
monostatic1957
side-looking1959
side scan1961
lookdown1968
the world > matter > physics > atomic nucleus > radioactivity > alpha radiation > [noun] > scattering > in reverse direction
backward scattering1938
back scattering1940
back scatter1957
1957 Gloss. Terms Nucl. Sci. (Nat. Res. Council, U.S.) 16/1 Back scatter.
1959 Manch. Guardian 11 Aug. 7/4 The United States Navy's successful experiments with ionospheric ‘back-scatter radar’, capable of detecting a nuclear explosion from thousands of miles away.
1960 Gloss. Terms Telecomm. (B.S.I.) 168 A signal received by back scattering is often referred to as back scatter.
This entry has not yet been fully updated (first published 1972; most recently modified version published online September 2018).
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n.1940