backscatter


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backscatter

 [bak´skat″er]
in radiology, radiation deflected by scattering processes at angles greater than 90 degrees to the original direction of the beam of radiation.

back·scat·ter

(bak'skat-ĕr),
Secondary radiation deflected more than 90° from the primary beam. See: scattered radiation.

backscatter

Cytometry
One of two parameters measured in flow cytometry, which is detected at a 90º angle to a laser light beam and corresponds to the fluorescence of individual cells or intracellular components stained with rhodamine- or isothiocyanate-labelled monoclonal antibodies.

Nuclear physics
Electromagnetic radiation—usually understood to be photons, but also ultrasonic waves, etc.—that reflects > 90º from the source, or back in the general direction of a source.

back·scat·ter

(bak'skat-ĕr)
Deflection of diagnostic radiation at angles exceeding 90 degrees to the direction of the beam.

backscatter

in radiology, radiation deflected by scattering processes at angles greater than 90 degrees to the original direction of the beam of radiation. Important in radiotherapy when estimating surface exposure dose.
References in periodicals archive ?
The backscatter devices consists of an antenna, a switching transistor and a load capacitance.
s] to the SAR sensor are projected into the same pixel O in the SAR image (Assume that the ground surface is divided into very small pieces, thus each pixel in the SAR image contains the backscatter contribution from more than one ground patches).
Critics have long complained that the backscatters expose passengers to a small dose of ionizing radiation, which at higher levels has been linked to cancer.
Truth: The Food and Drug Administration (FDA) regulates manufacturers to ensure the safety of full-body X-ray scanning devices, which includes backscatter scanners.
The 38-kHz echo sounder was the primary source for the quantitative rockfish backscatter measurements presented here.
Schauer advocates strict regulatory control of the backscatter scanners in order to ensure that their use is consistent with the goals and objectives of radiation protection, which include justification (benefits exceed cost or harm), optimisation (exposures are kept as low as reasonably achievable) and limitation (individual doses are limited).
MobileSearch([TM]) HE: Mobile X-ray system combining high-energy, high penetration transmission X-rays and Z Backscatter X-ray which offers improved detection of threats and contraband a wide field of view with no tire cutoff unlike transmission X-rays -- allowing for the effective scanning of passenger vehicles and tires.
AS&E will supply two additional Z Backscatter Vans (ZBV) to screen cargo and vehicles for explosive threats and contraband to help fight terrorism at seaports and land border crossings.
The experimental results support the conclusions of a Monte Carlo simulation that the spectrometer will reduce the uncertainty in a due to electron backscatter to less than 0.
one-sided measurement technique known as Compton Photo Backscatter, called
NDC, for instance, has broken out of its 15-year role as a supplier only of gamma backscatter sensors and has come out with its first beta gauge.
It may even backscatter, as Skocpol points out, and return to its starting point.