Foss Therapy Services, Inc.
Model 109 Reload / Decom
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In 2012, Foss Therapy Services completed both a JLS&A Model 109 source unloading and decomissioning as well as a Model 109 source reload in the field without the use of a hot cell. The source unloading took place towards the end of last year and was a complete success with all personel receiving less than 15mR . Last year, FTS loaded over 8,000 Curies of Cobalt 60 into a Model 109. The procedure went better than planned with source handlers receiving less than half of the expected/safe dose. This procedure took over 2 years to develop and we are very proud to be able to offer these services to customers throughout the world.

Foss Therapy Services has developed the tooling and procedures necessary to safely unload, reload and decommission the JL Shepherd and Associates Model 109 Irradiator on-site. We have transferred our expertise in Cobalt 60 teletherapy unit service to field transfers for these irradiators.

The Model 109 system incorporates a source carousel which includes 48 openings for Cobalt 60 capsules. A typical loading for the Model 109 system has 8 -16 sources. Uploading of sources to the Model 109 system is accomplished on-site utilizing shielded inserts and casks that have been developed specifically for this purpose.

Our procedures allow for installation or removal of one source at a time via a shielded plug insert with multiple access ports, a lead/tungsten/steel source transfer cask and a Type B/U Shipping cask assembly. We provide all the necessary rigging equipment to perform the procedure. The sources are moved between the irradiator and the shipping cask without exposure to the environment. A top lead / steel scattershield is included to minimize overhead radiation from the source transfers.

We can provide NEW Special Form Cobalt 60 Capsules for installation into the Model 109 units. We can upload each unit up to the maximum Curie loading.

We have developed tooling to 'free' stuck sources for decommissioning purposes. All proprietary tooling and procedures have been developed and tested at our shop, and radiation levels have been calculated with a 50% safety factor.

We would be pleased to assist you with any questions or inquiries. Please contact Joe Shepherd @ 626 818 3880.