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Argonne Tandem Linac Accelerator System

Radiation Safety at ATLAS

Onsite Emergencies: Dial 911 on the internal phones (or dial 630-252-1911 on cell phones).

For Non-Emergency safety concerns, email atlassafety@​anl.​gov.

ATLAS requires personnel in the facility to wear a thermoluminescent dosimeter (TLD) badge at all times.

Possible Contamination, Equipment Removal

Health Physics personnel must be contacted:

  • In the event of a possible contamination incident
  • Before beamline, or activated/contaminated equipment is removed from a beamline following an experiment

Use of Radioactive Sources at ATLAS

Policies regarding the use of radioactive sources at ATLAS vary by source type.

  • Sealed sources: Sealed sources are mainly used for calibrating gamma-ray detectors and are kept in safes in the experimental hall. Personnel who have completed the ATLAS Site-specific Training and Radiation Worker I equivalent training are allowed to use sealed sources. A thermoluminescent dosimeter (TLD) badge must be worn when using these sources. Sealed sources must be signed out prior to use.
  • Open Sources: Because there is the possibility of the spread of radioactive material in the use of open sources, more precautions are needed. Only Physics Division personnel who have completed the annual Open Source training, Rad Worker II and Rad Worker II Practical Training are allowed to handle open sources. Furthermore, Health Physics personnel may also need to be present, depending on the strength and isotope used.
  • Other sources: Other sources used at ATLAS include Cf-252 fission sources (open and sealed), and neutron sources (Pu-Be and Pu-C13). Because these sources contain Special Nuclear Materials, their use is restricted to Physics Division personnel.

More information on the use of radioactive sources at ATLAS may be found in the ATLAS Site-specific Training and Radiation Worker I equivalent training.

Outside Radioactive Material 

Radioactive materials for use at ATLAS must be brought in through the Special Materials representative. This includes calibration sources, radioactive targets, and any other radioactive materials. Please contact the ATLAS User Liaison (atlas.​user.​liaison@​anl.​gov) for assistance.

Removal of Equipment from Controlled Area

Health Physics Personnel must survey the following equipment BEFORE it is removed from the experimental area:

  • All items used in a beamline. 
  • Equipment that may have been contaminated or activated by exposure to beam and/or open sources. This includes targets, beamline components, detectors used inside vacuum enclosures, etc.  

ATLAS Radiation Interlock System (ARIS)

ARIS actively monitors radiation levels in the experimental and accelerator areas. ARIS also provides a mechanism to allow personnel into areas where beam may be present when the measured dose rate remains below 5 mrem/hr and the 8-hour integrated dose is less than 10 mrem in the monitored experimental area. Similarly, accelerator areas may be occupied when dose rates are less than 9 mrem/hr and the 8-hour integrated dose is less than 10 mrem