Radiation Protection Guides and Exposure Limits

No person should be exposed to any man-made radiation unless some benefit is derived from the exposure. 

Radiation exposure limits are set at such levels that nonstochastic biological effects do not occur. 

In every activity that may involve radiation exposure, it is not enough to keep exposure limits below the maximum allowed. Instead, every effort should be made to keep the exposure as low as reasonably achievable (ALARA). 

The ALARA principle is strictly enforced by the U. S. Nuclear Regulatory Commission (NRC). 

---