ionizing radiation that reaches an object from a radioactive source through scattering by the air
Note 1 to entry: The term is typically used to describe the scattering over the top of a shielding wall. Note 2 to entry: Sometimes the term includes the radiation scattered from the neighbouring structures. Note 3 to entry: This entry was numbered 393-17-30 in IEC 60050-393:2003.
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