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(Radiation, as used in this regulation, does not include non-ionizing radiation, such as radio- or microwaves, or visible, infrared, or ultraviolet light.) 6 eЂ ab w : ia, a, a, Aa, a a帳a, a, qa Ba, 5e aa w Aᐡi a a / Radioactivity : The emission of radiation by spontaneous nuclear transformation, or property of emitting radiation by spontaneous nuclear transformation. (b) transformation constant and half-life (2 points) / Transformation constant (5) : The rate of spontaneous nuclear transformation of nuclide A is proportional to the number of nuclei A : (where, N = number of nuclei A, 5= Transformation constant). The unit of this constant is sec-1, min-1 or hr-1, etc. Similarly, the term of decay constant or disintegration constant is used instead of this constant. / Half-life (T6 = ln2 /5) : The time required to transform to one half of the original number of nuclei. (c) transient and secular equilibriums of radioactivity (2 points) The activity ratio of daughter to parent nuclide is ; / Transient equilibrium When (for shorter-lived daughters), as tF4$4, (constant). / Secular equilibrium When (for very shorter-lived daughters), as tF4$4, . (d) stochastic effects and deterministic effects of radiation (2 points) / Deterministic effects : non-stochastic effects and proportional to the severity of the effects with threshold / Stochastic effects : probabilistic effects with no threshold and proportional to probability of occurrences (e) absorbed dose and dose equivalent (2 points) / Absorbed dose 6 The energy absorbed per unit mass of absorber medium due to radiation exposure. 6 Hence, it can be used for any materials including the human body. "_