Likelihood of Scrap Monitors to Detect Steel Contaminated at the Levels Proposed In Draft NUREG-1640


A. LaMastra


Following tests of scrap monitoring systems by the author from 1984 through 1998, it became apparent that high sensitivity scrap monitoring systems could detect scrap steel contaminated with energetic gamma emitters at the limits listed in Regulatory Guide 1.86. Additionally, with the incentive for increased detection sensitivity, it was felt that future systems would have an even greater likelihood of detection. Calculations were made to assess the likelihood of detection by current scrap monitoring systems and ten radionuclides were identified as likely to be detected. In addition to including release limits for volumetrically contaminated materials, NUREG-1640 also lowered several of the limits for gamma emitting radionuclides from those in Regulatory Guide 1.86. This change prompted a decision by the author to evaluate the likelihood of scrap steel containing contamination at the limits found in NUREG-1640 limits.


This abstract was presented at the 33rd Annual Midyear Meeting, "Instrumentation, Measurements, and Electronic Dosimetry", QA/QC Session, 1/30/2000 - 2/2/2000, held in Virginia Beach, VA.

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