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Accelerator Radiation Security Newsletter An Official Publication of the Health Physics Society's Accelerator Section Circulation: 476 Fourth Quarter 2010 Volume 19, Number 4 FROM THE OFFICERS The President's Message Mike Grissom In this final newsletter for 2010 (which you will receive early in 2011), I discuss the status for the upcoming 2011 HPS Mid-Year Meeting, planning for the 2011 Annual Meeting of the HPS, issues relating to the 2013 HPS Mid-Year, and a call for Section volunteers for a committee. Also in this newsletter, you will see items from Linnea Wahl relating to our Section’s efforts to gather nominees for HPS awards, recognition of members’ status, and issues relating to HPS membership. Scott Walker provides information regarding the long awaited approval of the Accelerator ANSI Standard (N43.1). Information on upcoming meetings is also provided in this issue in addition to our own meeting issues that I discuss below. 2011 HPS Mid-Year Meeting Sam Baker was assisted in planning the Accelerator Session for the upcoming February 2011 HPS Mid-Year in Charleston, South Carolina on “Radiation Measurements” by Carter Ficklen. Due to Carter’s business commitments,windows 7 home premium x86, Roger Maroney will be co-chairing the session with Sam. If we can attain a quorum, there also will be a Section Board of Directors (BOD) meeting at the Mid-Year. read more The Past President's Message Linnea Wahl We’ve all made our New Year’s resolutions, right? You may have read that Ed Maher, Health Physics Society (HPS) President, has resolved to reverse the 10-year decrease in society membership (see Health Physics News, October 2010,office 2010 pro x64, available online to HPS members at https:hps.orgmembersonlypublicationsnewsletter). In that same issue, the HPS Membership Committee announced its “Member-Get-a-Member” contest. Although this promotion just ended on December 31, 2010, don’t let that stop you from encouraging your unaffiliated colleagues to join the society (see the Membership Committee’s recruiting brochure). There’s never a deadline on sharing a good thing. All of this started me wondering about the HPS Accelerator Section membership. Have we attracted any new members lately? And how are we doing at retaining our long-time members? I took a look at the HPS membership directory and here’s what I found. read more In this issue o From the Officers o From the Correspondents o Other News o How to Subscribe o Newsletter Archives Also of interest o Accelerator Section Website o HPS Website o Reflections on the 2008 o Professional Development School o Purchase 2008 School Textbook OFFICERS President: Mike Grissom, Stanford Linear Accelerator, Retired President-Elect: Rich Brey, Idaho State University Past President: Linnea Wahl, Berkeley National Lab Secretary: Mike Sandvig, Idaho National Lab Treasurer: Steve Frey, SLAC National Accelerator Lab,office 2010 pro plus 32bit, retired Newsletter Editor: Keith Heinzelman, Berkeley National Lab Directors: Sam Baker, Argonne National Lab Eric Burgett, Idaho State University Lorraine Marceau-Day, Louisiana State University Elsa Nimmo, University of California,office 2010 Professional x86, Berkeley Reg Ronningen, Michigan State University Jack Topper,Office 2010 Professional Plus, Livermore National Lab ANSI N43.1: Radiation Safety for the Design and Operation of Particle Accelerators Approved by ANSI N43 Committee Scott Walker After many years of effort (May 1996-December, 2010), the N43 committee body has approved the ANSI N43.1 standard. The standard itself took approximately 8 years to write. The original N43.1 standard was written for accelerators with energy ranges from 0.1 to 100 MeV and only included a single chapter on radiation security. The current document was written on a graded basis (the higher the risk, the tighter the controls) to include all particle accelerators and addresses: Radiation Safety Program (Design, Security Envelope). Radiation Security System (Radiation Control Design Parameters), Access Control System (Interlocks and Controls), Radiation Control System (Passive shielding and Active Beam Inhibiting Controls), Accelerator Operations (including interlock bypasses), Operational Radiation Security (Radiation Monitoring, Environmental Controls & D&D), Training. In addition the new standard has four appendices: Development of Security Assessment Document (SAD), Interlocked-Type Access Control Systems, Decommissioning Program, Measurements of Radiation and Radioactivity, Examples of Security Standards for Commercially Available andor Production-Type Accelerators. read more Volunteer Opportunities Linnea Wahl Are you interested in having a say about how the Health Physics Society (HPS) operates? One way to make your voice heard is to serve on an HPS committee. The society recently put out a call for committee volunteers, and President-elect Kathy Pryor will make committee assignments at the midyear meeting in early February. There are many committees in need of your expertise—see the list at Most have vacancies coming up that need to be filled (with the possible exception of the Homeland Protection Committee, which is fully staffed). read more USPAS at Stony Brook University June 13-24, 2011 The U.S. Particle Accelerator School is offering a program of graduate-level credit courses sponsored by Stony Brook University and held in Melville, New York from June 13-24, 2011. Two undergraduate course and nine specialized graduate-level courses will be offered. Two courses you may find interesting are "Medical Applications of Accelerators" and "Project Management for Scientists and Engineers". Please visit our website for full course descriptions and an electronic application form. For further information please contact the USPAS Office at 630-840-3896 or uspas@fnal.gov 15th International Conference on Emerging Nuclear Energy Systems, May 15-19, 2011 –San Francisco, California The 15th ICENES is being hosted by the Northern California Section of the American Nuclear Society and two ANS Technical Divisions – Fusion Energy Division and Operations & Power Division. ICENES has a long history as a venue for sharing ideas and research results on emerging nuclear energy technologies and applications. The complete list of conference topics can be found here. FROM THE CORRESPONDENTS News from the Spallation Neutron Source, Oak Ridge National Laboratory SNS is entering one of two annual six-week-long maintenance periods. For the last month of the latest production run, SNS ran with 1 MW of protons on target with over 90% availability for users during scheduled production. This period of reliable high-power operation provided an opportunity to perform two interesting tests with beam on target – collecting a high-resolution gamma spectrum of stack emissions, and analyzing activation levels in tunnel air. The majority of the radioisotopes sent to the SNS stack begin as spallation products from the mercury target. Many of the radioisotopes in the mercury off-gas are decayed by passage through a delay tank or captured on filters, so the majority of the radioactive material reaching the stack consists of short-lived positron emitters (C-11, O-15, etc.). For this reason, SNS monitors stack emissions using a gamma detector mounted on the side of the stack instead of the traditional filter-based system. Periodically, we also collect a high-resolution gamma spectrum to confirm the predicted emissions nuclide distribution. The latest spectrum is strongly dominated by 511 keV gammas produced from positron annihilation, with a small amount of Ar-41 as the only other detectable contribution. Tritium is also present in the stack exhaust, but the reported tritium contribution is based on calculated ratios since the tritium is not detected by the gamma detectors. The observed spectrum is consistent with the predicted observable gamma emissions. read more Subscribe or Update Your E-mail Address here Designed by TemplateWorkz.com If you wish to contact the editor of this newsletter click here