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Scan MDCs for Multiple Radionuclides in Class 1 Areas

Abelquist, Eric W.

Operational Topic

The MultiAgency Radiation Survey and Site Investigation Manual (MARSSIM), published in December 1997, has been used for designing final status surveys at a number of D&D sites to date. One of the more challenging aspects of the MARSSIM survey design is the strategy employed when multiple radionuclides are present, particularly in Class 1 survey units. The MARSSIM recommends that potential hot spots in a Class 1 survey unit—that could exceed the derived concentration guideline levels for small elevated areas of radioactivity (i.e., DCGLEMC)—have a reasonably good probability of being detected. Soil sampling on a specified grid size, in conjunction with gamma radiation surface scanning, is used to obtain an adequate assurance level that these hot spots are not missed during the final status survey. Therefore, it is sometimes necessary to supplement the sample size required by the statistical test to provide additional assurance that potential hot spots of concern are detected.

Determining the scan MDCs when multiple radionuclides are present in the survey unit.

* Radiological Safety, Assessments and Training Oak Ridge Institute for Science and Education, Oak Ridge, TN 37831-0117.

© 2003 by the Health Physics Society