| backscatter | Induced radiation deflected more than 90 |
|---|---|
| backscattered electron | <microscopy> Produced by an incident electron colliding with the nucleus of an atom in the specimen. The incident electron is then scattered backward about 180 degrees with no appreciable loss of energy, an elastic collision. (05 Aug 1998) |
| backscattered electron imaging | <microscopy> The production of backscattered electrons from a sample varies directly with the specimen's average atomic number, higher atomic number elements produce more backscattered electrons than lower atomic number ones. Detection of Backscattered Electrons is achieved by using a donut shaped solid state saemiconductor device mounted on the bottom of the objective lens. When Backscattered Electrons strike the detector electron-hole pairs are created which are then counted. This quantity is translated into a pixel intensity and displayed on the CRT, forming the image. By splitting the detector into halves (or quadrants) differences in the signal level on the individual detector segments provide surface topography information. (05 Aug 1998) |
| backscattering | <radiobiology> Deflection of incident particle / radiation through an angle greater than 90 degrees relative to the original direction of motion/propagation. (09 Oct 1997) |
| backside | The hinder part, posteriors, or rump of a person or animal. Backside (one word) was formerly used of the rear part or side of any thing or place, but in such senses is now two words. Origin: Back, a. + side. Source: Websters Dictionary (01 Mar 1998) |
| backstress | A female baker. Source: Websters Dictionary (01 Mar 1998) |
| backup electricity, backup services | Power or services needed occasionally; for example, when on-site generation equipment fails. (05 Dec 1998) |
| backup rate | A utility charge for providing occasional electricity service to replace on-site generation. (05 Dec 1998) |
| backward curvature | Curvature in which a more distal or cephalad part is deviated posteriorly with respect to the coronal anatomic plane. (05 Mar 2000) |
| backward heart failure | A concept (formerly considered mutually exclusive of forward heart failure) that maintains that the phenomena of congestive heart failure result from passive engorgement of the veins caused by a "backward" rise in pressure proximal to the failing cardiac chambers. Compare: forward heart failure. (05 Mar 2000) |
| backwash | To clean the oil from (wood) after combing. Source: Websters Dictionary (01 Mar 1998) |
| backwash ileitis | Involvement of the terminal ileum by the inflammatory and ulcerative changes seen in chronic ulcerative colitis; distinguished from involvement of ileum and proximal colon by regional (granulomatous) enteritis (e.g., Crohn's disease of terminal ileum and proximal colon). (05 Mar 2000) |
| backwoods | The forests or partly cleared grounds on the frontiers. Origin: Back, a. + woods. Source: Websters Dictionary (01 Mar 1998) |
| backwoodsman | A men living in the forest in or beyond the new settlements, especially on the western frontiers of the older portions of the United States. Source: Websters Dictionary (01 Mar 1998) |
| backworm | A disease of hawks. See Filanders. Origin: 2d back,+ worm. Source: Websters Dictionary (01 Mar 1998) |