Portion of radiationEnergy dispersion through matter or space. In atomic physics... emitted by a radiationEnergy dispersion through matter or space. In atomic physics... source which reaches the observed receiving pointThe geographical point at which the effluent plume from a st... via the shortest distance, possibly weakened by existing shieldingProtection facility around radioactive sources and nuclear i... walls. The direct radiationEnergy dispersion through matter or space. In atomic physics... is distinguished from scattered radiationEnergy dispersion through matter or space. In atomic physics... which may reach the receiving pointThe geographical point at which the effluent plume from a st... indirectly due to scatteringProcess whereby collision with another particle or particle ... on other media.