California Department of Transportation District 1
Caltrans > District 1 > Materials Laboratory > Nuclear Density and Asphalt Content Gauge Procedures
 

Nuclear Density and Asphalt Content Gauge Procedures

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To receive a nuclear gauge for field use, a CalTrans Certified Materials Tester holding a valid Radiation Training Certificate must contact and take delivery of the nuclear gauge from the District 01 Radiation Safety Officer (RSO), or the Alternate Radiation Safety Officer (ARSO) and comply with all pertinent sections of CTM 121.  When a gauge is returned, either the RSO, the ARSO or their appointed delegate must be present to receive, log in and secure the gauge.

RSO (707) 445-6374

ARSO (707) 445-6375

 
 
http://www.dot.ca.gov/hq/esc/ctms/CT_121.pdf

Tips and Reminders:

  1. The nuclear gauge must be transported and stored with the corresponding 3-ring binder and under a minimum of three (3) locks.
  2. Never leave a gauge unattended.
  3. Never use a gauge in the rain, not even light rainfall.
  4. CalTrans’ license with the California Department of Health Services, Radiological Health Branch, requires Bi-annual wipe/leak tests and analysis on all gauges.  These tests are performed at the end of January and July.  Therefore, all gauges must be returned to the Lab during those weeks.  Replacement gauges will be available to those with testing needs.
  5. It is the Field Tester's is responsibility to notify the RSO if the gauge is moved to a location different from the location originally reported.