See Figure 8.7 . If this maintenance or repair is not performed properly with attention to good radiation safety principles, the gauge may not operate as designed and personnel performing these tasks could receive radiation doses exceeding NRC limits.
Some gauges contain sources of even higher activities with correspondingly higher dose rates.
Describe the types of work, maintenance, cleaning, repair, etc., to be performed that necessitate detaching the source or source rod from the device or that could cause personnel to receive radiation doses exceeding NRC limits. The principal reason for obtaining this information is to assist in the evaluation of the qualifications of individuals who will conduct the work and the radiation safety procedures they will follow. Submit procedures for safe handling of the radioactive source while the source or source rod is detached from the gauge. Confirm that individuals performing non-routine maintenance on gauges will always wear both whole body and extremity monitoring devices or that an evaluation will be available to demonstrate that these individuals are not likely to receive, in one year, more than 10 percent of the applicable dose limits. The dose limits are illustrated in Figure 8.3 .