The Colorado Department of Health and Environment (CDPHE) requires radioactive material licensees to monitor adults "... likely to receive, in one year from sources external to the body, a dose in excess of 10 percent of the applicable limits in 6 CCR 1007-1 Part 4.6.1 ..."
This means any adult likely to receive a dose of 500 mrem, in one year, must be monitored for penetrating exposure. Exposure to penetrating sources of radioactive material in a biomedical research setting is not common and review of personal monitoring results confirms that an individual is unlikely to receive a dose in excess of 500 mrem in one year. In fact, monitoring results show occupational exposure to penetrating radiation has not exceeded 100 mrem in one year.
The As Low As Reasonably Achievable (ALARA) program provides two dose levels (ALARA I and ALARA II) whereby the Radiation Safety Officer (RSO) must investigate potential exposures that exceed the outlined levels. Any individual who exceeds either an ALARA I or ALARA II level will be contacted by the RSO to investigate the reading.
The Radiation Safety Officer continuously reviews radioactive material use and personal monitoring results to ensure compliance with the regulatory requirements and the ALARA program.