radiation scattering

Radiation scattering is the deflection of radiation (electromagnetic or products of nuclear decay) from its original path as a result of interaction or collisions with atoms, molecules, or larger particles in the atmosphere or other media between the source of radiation and an observation point some distance away. As a result of scattering, radiation may be received at such a point from many directions instead of only from the direction of the source. This phenomenon has been observed in nuclear bomb tests, explaining observed non-uniform patterns of destruction and radiation. For nuclear bombs, the effect is especially strong for gamma rays and neutrons. Another example of radiation scattering is gravitational lensing. This effect may cause light from a single star to appear to be coming from two distinct points in space, when light waves are sufficiently "bent" by gravity from a massive object between the star and Earth.

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protocol data unit
provisioning
pseudorandom noise
pseudorandom number sequence
psophometer
psophometric voltage
public data transmission service
public land mobile network
pulsating direct current
pulse
pulse address multiple access

pulse amplitude
pulse code modulation
pulse duration
pulse link repeater
pumping
push to talk operation
push to type operation
quadrature
quadruply clad fiber
quality control
quasi analog signal

queuing delay
radiation angle
radiation mode
radiation pattern
radio equipment
radio fix
radio horizon
radiometry
randomizer
random number
receive after transmit time delay

received noise power
receiver attack time delay
recognized operating agency
recorder warning tone (us)
record medium
recovery procedure
reference circuit
reference clock
cycloid
reference noise
reference surface