Level
Level : Action Level: The level of dose rate or activity concentration above which remedial actions or protective actions should be carried out in chronic exposure or emergency exposure situations. An action level can also be expressed in terms of any other measurable quantity as a level above which intervention should be undertaken. Emergency Action Level (EAL): A specific, predetermined, observable criterion used to detect, recognize and determine the emergency class. An EAL could represent an instrument reading, the status of a piece of equipment or any observable event, such as a fire. In this sense, it is not strictly an action level as defined above, but has essentially the same function. Clearance Level: A value, established by a regulatory body and expressed in terms of activity concentration and/or total activity, at or below which a source of radiation may be released from regulatory control. See also: Clearance (1). Exemption Level: A value, established by a regulatory body and expressed in terms of activity concentration, total activity, dose rate or radiation energy, at or below which a source of radiation may be granted exemption from regulatory control without further consideration. A regulatory body may also grant exemption on a case by case basis, following notification. Although the term exemption level does not strictly apply in such a situation, a criterion for exemption may nevertheless be established by the regulatory body, expressed in similar terms or, alternatively, in terms of annual dose on the basis of an appropriate dose assessment. (See: Para. 5.12 of RS-G-1.7 and para. 2.26 of RS-G-1.1.) In the BSS, the term exemption levels is used, and values are specified in Table I-1 of Schedule I, but neither exemption nor exemption level is defined in the BSS glossary. Guidance Level: A level of a specified quantity above which appropriate actions should be considered. In some circumstances, actions may need to be considered when the specified quantity is substantially below the guidance level. 1 Guidance Level for Medical Exposure: A value of dose, dose rate or activity selected by professional bodies in consultation with the regulatory body to indicate a level above which there should be a review by medical practitioners in order to determine whether or not the value is excessive, taking into account the particular circumstances and applying sound clinical judgement
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