Re:

[Paul Tyree <mrpmt@empire.net>]

A steradian is the solid angle described by the reciprocal of a 4 pi
geometry, i.e. 1/4*pi = .07958 geometry. It ideally qualifies the
relationship of a detector to an emitter for employment of the venerable
"inverse-square-law". That is, that the radiating flux/dose varies as the
square of the distance between emitter and detector when the detector solid
angle cross section is ² a steradian. The objective of this geometry
constraint is to provide that all emissions and detections are of equal
effeciency.

Well, I hope my definition is of practical use to you, Mike.

Paul Tyree
<mrpmt@empire.net>

Mike Dupray wrote:

> Does anybody know what a steridian look like in cross section?
> Michael R. Dupray
> Senior Staff Health Physics Technician
> General Atomics
> 619-455-3561
> FAX 619-455-3465
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