The RSI is used as a guide and is not the single deciding factor for these determinations. The RSO may adjust a monitoring frequency for a laboratory from quarterly to monthly if repeat violations of RUA conditions warrant increased surveillance. The most conservative ALI is used, i.e., between ingestion, inhalation and stochastic and non-stochastic values, the lowest value is used. The ALIs are broken out in four groups. An Internal Value is assigned based on which group the ALI for that isotope falls into.
Group one has an IV of one, group two has an IV of two, etc.
The value of the isotope's gamma constant is used to determine the EV based on the following table. This value does not include waste totals in waste receptacles ready for pick-up. The IRF and ERF are used to adjust the RSI if the RSO or reviewer finds that engineering controls, procedures, or the nature of the compound will reduce the potential for intake or external exposure. Although the nature of these factors generally reduce the safety factor, the RSO, in some cases, may use a number less than 1 to raise the RSI to account for potential dose concerns. The IRF and ERF shall range between 0.5 and 5 and should routinely be 1.0.