geometric attenuation

geometric attenuation

[‚jē·ə¦me·trik ə‚ten·yə′wā·shən]
(nucleonics)
That part of the reduction in the intensity of ionizing radiation with distance from a source which is associated with spreading out of the radiation and is independent of the interaction of the radiation with matter.
References in periodicals archive ?
0] mode at 539 kHz for a mid-plane source are compared to the amplitude-based geometric attenuation of a wave spreading in-plane.
It is interesting to note that the added attenuation relative to geometric attenuation for these mode/frequency combinations is about 12 to 15 dB for these two cases.