Advanced Photon Source

An Office of Science National User Facility

Experiment Hazard Class 8.3 – X-Ray Generators


This hazard classification applies to all experiments involving the use of X-Ray Generators (other than the APS storage ring).

As specified in LMS-PROC-109 a Radiation Generating Device (RGD) must be registered with the Argonne RGD Safety Officer using the ANL-847 form. The RGD will be assigned an inventory number, hazard class, RWP requirement, and inspection and survey frequencies.

Experiment Category

Experiments the Experiment Hazard Class are always categorized as High Risk.

Experiment Hazard Control Verification Statements

Engineered Controls – As determined in LMS-PROC-109. Samples chambers and all beam paths are fully enclosed by barriers. Class 2 and higher RGDs require an interlock to fail-safe beam shutter/beam stop or radiation generator power supply and completion of an ANL-848 form - Radiation-Generating Device Inspection..

Procedural Controls – An Operating Procedure is required that addresses:

  • RGD normal operation instructions
  • Emergency response, including off-normal alarms, abnormal external radiation level, and proper notification
  • Methods and occasions for locking and securing the RGD
  • Calibration and alignment of the useful beam, as needed
  • Documentation of operational checks, inspections, and testing records
  • Control of keys or computer passwords for RGD operation
  • Interlock test procedure

Design Reviews and Equipment Inspections – The need for engineered or procedural controls will be determined by review with RSO-HP and the AES ES&H Coordinator.


  • Class 1 RGD - ESH738 (GERT)
  • Class 2 or higher RGD:
  • Radiological Worker for X-Ray Users (ESH713)
  • Analytical X-Ray Device Safety (ESH705)

Signs and Labeling – All signs and postings required for the area will be supplied by RSO Health Physics.

Personal Protective Equipment – As determined by review with RSO-HP.

Dosimetry and Monitoring – All users involved in the experiment will be required to wear a dosimeter during the experiment. Class 2 or higher RGD also requires a ring-badge to be worn.

Experiment Authorization

Unless otherwise noted in the approved experiment safety plan, the PSC Deputy Associate Laboratory Director of Operations delegates the authority to authorize an experiment in this hazard class to any of the persons in the beamline personnel that appear in the list of Beamline Manager personnel authorized to approve experiments and a member of the APS Experiment Review Board.

Hazard Control Verification

The PSC Deputy Associate Laboratory Director of Operations delegates responsibility for verifying that required controls are in place to personnel delegated the authority to perform this task to RSO-Health Physics or APS Experiment Review Board, the experiment On-site Spokesperson, and Beamline Management personnel having experiment safety responsibilities.


Argonne Radiological Safety Program Description, January 2017 (Internal link)

ANL LMS PROC-109: Control of Radiation Generating Devices 10/31/2014 (Internal link)

ANL LMS PROC-143: Radiation Safety Interlock System 8/11/2016 (Internal link)

Please contact Bruce Glagola or Nena Moonier if you can not access the internal link

Reviewed: March 13, 2017