Tech-5: Implementing EB–X technology

Wednesday November 09, 2022 from 08:30 to 10:00

Room: Lunar

Tech-5.5 The needed expansion of X-ray and E-beam for sterilization – progress of Team Nablo, an international collaboration team

Mark K. Murphy, United States

Senior Research Scientist
Radiation Measurements & Irradiations
Pacific Northwest National Laboratory

Abstract

The needed expansion of X-ray and E-beam for sterilization – progress of an international collaboration team

Leonard Fifield1, Mark Murphy1, Suresh Pillai2, Matt Pharr2, David Staack2, James McCoy3, Erick Gustin4, Samuel Dorey5, Emily Craven6, Todd Powell7, Monica Cardona8, Florent Kuntz9, Nicolas Ludwig9, Larry Nichols10, Cody Wilson11, Sylvain Marque12.

1Pacific Northwest National Laboratory, Richland, WA, United States; 2Texas A&M University, College Station, TX, United States; 3Becton-Dickinson, Franklin Lakes, NJ, United States; 4Stryker Corporation, Kalamazoo, MI, United States; 5Sartorius Stedim Biotech, Aubagne, France; 6Boston Scientific, Marlborough, MA, United States; 7Bayer Corporation, Indianola, PA, United States; 8MilliporeSigma, Bedford, MA, United States; 9Aerial CRT, Illkirch, France; 10Steri-Tek, Fremont, CA, United States; 11IBA Industrial, Louvain-la-Neuve, Belgium; 12Aix Marseille University, Aix, France

Market forces are increasingly pushing manufacturers and system integrators of polymer-based products to diversify their options for sterilization methods. This needed diversification in options for sterilization modality must involve the irradiation modalities of X-ray and electron beam (e-beam).  Although the technology of these two irradiation modalities is mature and dependable, the lack of data on resulting polymer effects, and the lack in number of facilities, are two of the main impediments. In an effort to fill these data, knowledge and tool gaps, an international collaboration team was formed in 2018. This “Team Sam Nablo”, currently has 13 active member organizations. This presentation summarizes the team’s ongoing projects, including the results of studies comparing the differences in radiation effects between gamma, X-ray and e-beam irradiated products.

So far, the team has tested 10 polymer devices from five manufacturers (involving near 30 distinct polymers) to cobalt-60, e-beam and X-ray fields to determine the influence of absorbed dose and irradiation modality on the effects observed. The team is also performing comprehensive studies to elucidate the influence of dose rate and oxidative environments on these effects in polymers.

One general conclusion from the testing is that many polymer properties are affected by the high radiation dose levels involved with sterilization, but differences in effects between the three radiation modalities are generally minor. The most profound influence of irradiation modality observed was an increase in yellowing in certain polymers such polycarbonate (for the X-ray modality) and polyvinyl chloride (for the e-beam modality).  The data has resulted in eight manuscripts, soon to be published.


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