The guiding principle is to keep this risk "as low as reasonably achievable" (ALARA).

Optimization: Radiation doses should all be kept as low as reasonably achievable.

The nuclear industry works on the principle that doses should not only be kept below the maximum but should be "as low as reasonably achievable."

This will enable them to maintain patient doses "as low as reasonably achievable" (ALARA).

The role of FDA is to drive that risk to the lowest level reasonably achievable without unduly decreasing the availability of this life saving resource.

In general, the ALARA principle (as low as reasonably achievable) should be followed.

He noted that those standards were stated two ways, with absolute numbers and with a separate requirement that exposures be "as low as reasonably achievable."

Annual review of the radiation safety program for adherence to ALARA (as low as reasonably achievable) concepts.

From recent data, it became clear that these limits would impose requirements beyond the scope of what is reasonably achievable, without benefit to public health.

A slight increase from 1 mg/kg to 1.5 mg/kg is proposed, because data shows that the lower level for lead is not reasonably achievable.