Accelerator Radiation Safety Newsletter



An Official Publication of the

Health Physics Society's Accelerator Section

Circulation: 466

Second Quarter 2010 /
Volume 19, Number 2



The President's Message
Linnea Wahl

This is my final article as Accelerator Section president, since the next issue of the newsletter will introduce the new board members who took office at the section’s annual business meeting in Salt Lake City in June. The past year has been productive, and we rightly have been praised as one of the most active sections in the Health Physics Society. The willingness of our members to serve the section explains our success.

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The President Elect’s Message
Mike Grissom

As noted by Linnea in her “From the President” item above, members of the Section contributed to a full Accelerator Special Session at the 55th Annual Meeting of the HPS in Salt Lake City, Utah. I encourage all Section members to recommend that their colleagues join the Accelerator Section. I firmly believe that all University, Military and Medical RSOs (at the least) should be members of the RSO, Medical and Accelerator Sections of the HPS. I also recommend that the Associate members who did not renew after the Oakland 2008 Midyear be contacted by those of you who know who they are regarding rejoining the HPS. Further, my congratulations to all Section members who received awards at the meeting.

Though it may seem strange, we are already in a position to call for papers for an Accelerator Session at the upcoming HPS Midyear meeting on Radiation Measurements in Charleston, South Carolina, to be held February 6-9, 2011.

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The Editor’s Message
Keith Heinzelman

The 2010 Annual Meeting of the HPS in Salt Lake City included many excellent presentations related to accelerator radiation protection.  For those who did not attend the meeting, we have reprinted abstracts from several of the papers presented.  Two of the abstracts deserve special mention as they earned student awards for their presenters:

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In this issue

From the Officers
From the Correspondents
Other News

How to Subscribe
Newsletter Archives

Also of interest

Accelerator Section Website
HPS Website
Reflections on the 2008

Professional Development School
Purchase 2008 School Textbook


Linnea Wahl, Berkeley National Lab

Mike Grissom, Stanford Linear Accelerator, Retired

Past President:
Henry Kahnhauser, Brookhaven NationalLab

Mike Sandvig, Idaho National Lab

Marcia Torres, SLAC National Accelerator Lab

Newsletter Editor:
Keith Heinzelman, Livermore National Lab

Sam Baker, Argonne National Lab


Mike Duran, Los Alamos National Lab

Elsa Nimmo, University of California, Berkeley

Reg Ronningen, Michigan State University

Mike Singh, Livermore National Lab

Jack Topper, Livermore National Lab


Abstracts from the 2010 Annual Meeting of the Health Physics Society, Salt Lake City

The Estimates of Skin and BFO Dose Rates, Dose Equivalent Rates and Accumulated Doses for human crews on the surface of the Moon from 15 January 2005 Solar Energetic Particle Event using Earth-Moon-Mars Radiation Environment Module M. PourArsalan*, The University of Tennessee ; L.W. Townsend, The University of TennesseeM.I. Hall, The University of TennesseeN.A. Schwadron, Boston UniversityK. Kozarev, Boston UniversityM.A. Dayeh, Sothwest Research Institute;M.I. Desai, Sothwest Research Institute

Radiation Dosimetry for 10 MeV Neutrons Using XRQA Radiochromic Film SL Brady*, Duke University ; R Gunasingha, Duke University; TT Yoshizumi, Duke University; CR Howel, Duke University; AS Crowell, Duke University; B Fallin, Duke University; AP Tonchev, Duke University; MW Dewhirst, Duke University

The BNL National Synchrotron Light Sources W. R. Casey*, NSLS-II BNL

Radiation Shielding And Radiation Protection Issues At The European Synchrotron Radiation Facility P Berkvens*, European Synchrotron Radiation Facility

Evaluation of Open Waveguide RF Hazard RT May*, Jefferson Lab

Radiation Safety Aspects of the Linac Coherent Light Source at SLAC Sayed/H Rokni*, SLAC National Accelerator Laboratory ; James/C Liu, SLAC National Accelerator LaboratoryX. Stan Mao, SLAC National Accelerator LaboratoryAlyssa/A Prinz, SLAC National Accelerator LaboratoryMario Santana Leitner , SLAC National Accelerator LaboratoryJoachim Vollaire, SLAC National Accelerator Laboratory

LANL As-73/74 Extremity Exposure Events L. S. Walker*, Los Alamos National Laboratory ; M. Duran, Los Alamos National Laboratory; M. L. Martinez, Los Alamos National Laboratory; J. Salazar, Los Alamos National Laboratory; P. Ortega, Los Alamos National Laboratory

USPAS at Old Dominion University January 17-28, 2011

We are proud to announce that our next program of university-style credit courses will be sponsored by Old Dominion University and held in Hampton, Virginia from January 17-28, 2011.  Participants may earn 3 credits from Old Dominion University or may choose to audit their course. One undergraduate-level course and eleven specialized graduate-level courses will be offered.   Financial support is limited and will be awarded on a competitive basis. To be considered for financial support you must submit four documents: a completed application form, a cover letter explaining why the USPAS is important to your career; your CV; at least one letter of recommendation. Participation is open to both U.S. and non-U.S. residents.

Please visit for full details and an electronic application.



News from the Spallation Neutron Source, Oak Ridge National Laboratory


SNS shipped the first used target module to its final resting place at the Nevada Test Site in May 2010.  The circulating mercury target material meets the megawatt beam of protons traveling at 1 GeV inside the stainless steel target module, creating a shower of neutrons that are moderated and then used by scientific experiments on 18 SNS beamlines.  After 2.3 years and about 3,000 MW-hrs of beam the target module became brittle as well as highly activated, especially the “nose” section where the proton beam passes through the target module on its way into the mercury.  After removal from service, all mercury was drained from the target and eventually the spent target module was ready to be shipped away for disposal.  After at least four months of decay, the empty target module is estimated to contain about 6,000 Curies of activity, with a long list of isotopes produced by spallation of the stainless material.  The dose rate of the drained target module was measured to read approximately 1,500 R/h at a meter.  In order to make sure the target module was completely drained of mercury, two holes were drilled in the nose section.  The metal coupons resulting from the drilling were about 3 mm thick and 2 ˝” in diameter.  Each of these coupons measured 25 to 40 R/h at a foot.  The coupons will be examined in order to learn more about damage to the target module material.


Planning and preparation for the disposal of the used target module began in the earliest days of the SNS project.  The target load-out operation affected many aspects of the design of the Target-handling  portion of the Experiment Hall, and detailed procedure preparation took place over a period of more than a year.  Many details must be pinned down the first time such an operation is planned, and some parts of the job will not work out exactly as envisioned in the quiet of a planner’s office.


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