RP Department

Dosimetry & Rad Env Protection

Field Operations

Laser Safety

Radiation Physics

Rad Waste Management

Material Restrictions

Certain materials are required to have approval of the Radiation Protection Department (RPFO Group Leader or SLAC Radiation Safety Officer) prior to bringing them on site at SLAC National Laboratory.   

Use of Radioactive Material and Non Radioactive Material listed on Table I.1, Sealed Radioactive Sources and X-ray generating machines (Radiation Generating Devices)

Restrictions on the use of radioactive materials and radiation generating devices at SLAC National Accelerator Laboratory are very strict. The SLAC Radiological Control Manual [pdf], Article 365 contains the requirements bringing these items to SLAC National Accelerator Laboratory. The purpose for these restrictions is to minimize the radiation dose consequences and to meet strict regulatory quantities related to radioactive materials.

1. Some consumer products, industrial machines and devices contain radioactive sources such as:
   - Nuclear Moisture Density gauges
   - Radiography NDT sealed radioactive sources.
   - Radioactive sources for testing detectors and other equipment.
2. Some machines generate x-radiation as a primary or secondary by-product such as:
   - X-ray diffraction units
   - Vacuum tubes
   - klystrons
3. All materials listed in the table below MUST have approval from the Radiation Protection Department prior to bringing to SLAC National Laboratory.

If any subcontractor or lower tier subcontractor is considering purchasing, or bringing such material onto the SLAC site, they shall notify and receive authorization BEFORE bringing these or similar materials to SLAC National Accelerator Laboratory. Review and authorization is needed prior to bringing these items on site.  To receive authorization:

• Call the Radiation Protection Department Field Operations (RPFO) at 650-926-4299
• or Email the RPFO group Leader, Manager, Jim Allan (jallan@SLAC.stanford.edu)
• or Email the Radiation Safety Officer, Sayed Rokni (rokni@SLAC.stanford.edu)

Use of Exempted Radioactive Consumer Products

These materials must have the approval of the Radiation Protection Department (RPFO Group Leader or SLAC Radiation Safety Officer) prior to bringing to SLAC National Laboratory.

Restrictions on the unnecessary use of the Nuclear Regulatory Commission exempt radioactive consumer products (such as Tungsten Inert Gas welding electrodes, sand blast grits, bead blasting, and grinding wheels containing Thorium) are part of the SLAC Radiological Control Manual [pdf]. The purpose for these restrictions is to minimize the potential for spread of radioactive contamination or dose consequences related to the inappropriate use of such consumer products.

1. The following requirements are stated in the SLAC Radiological Control Manual, Article 415.
   • Whenever such products are considered for use at SLAC, the user/ contractor is required to notify the Radiation Protection Department to justify its use, obtain approval, and apply specified engineering controls prior to bringing to the SLAC site.
   • For thoriated tungsten welding rods or grinding wheels, this Manual has been amended to invoke a Radiological Work Permit or Written Procedure ( Article 312) for this process. Engineered controls are required as appropriate (Article 453) to control the airborne activity and the surface contamination.
2. In addition to the restrictions for use of welding electrodes and grinding wheels containing Thorium, there may be restrictions on other consumer products. Such radioactive material may be byproduct material (created in a reactor) or source material (uranium and thorium) and may be used for one of the functions listed in the following table.

If any subcontractor or lower tier subcontractor are considering purchasing, or bringing such material onto the SLAC site, they shall notify and receive authorization BEFORE bringing these or similar materials to SLAC National Accelerator Laboratory. Review and authorization is needed prior to bringing these items on site.  To receive authorization:

• Call the Radiation Protection Department Field Operations (RPFO) at 650-926-4299
• or Email the RPFO group Leader, Manager, Jim Allan (jallan@SLAC.stanford.edu)
• or Email the Radiation Safety Officer, Sayed Rokni (rokni@SLAC.stanford.edu)