Accelerator Radiation Safety Newsletter



An Official Publication of the

Health Physics Society's Accelerator Section

Circulation: 476

First Quarter 2011 /
Volume 20, Number 1



The President's Message
Mike Grissom

In this first newsletter for 2011, I discuss the 2011 NCRP Annual Meeting which provided topics strongly related to the radiation protection aspects of accelerator operations, some further thoughts on the 2013 HPS Mid-Year and as a separate item in this newsletter I provide an update on the post-earthquake/tsunami status for our colleagues’ J-PARC facility at Tokai, Japan. Also, you will see items from Linnea Wahl relating to our Section’s great success in obtaining 2011 HPS awards for our members (two G. William Morgan Lectureships and the Founders Award). Rich Brey provides information on the rapidly approaching 2011 HPS Annual Meeting in Palm Beach, for which the HPS sent out pre-registration information just this past week. There also is an item on the post-earthquake/tsunami effects on KEK in Japan.

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The President Elect's Message
Rich Brey

I’m happy to report that the 2011 HPS Mid-Year Meeting (see Sam Baker’s article in this issue of ARSN) was a substantial success for the HPS Accelerator Section and that the 2011 HPS Annual Meeting to be held in Palm Beach, Florida this June seems to be shaping up into yet another useful and productive effort. There are many exciting events on the horizon and I encourage your attendance and participation at the 2011 HPS Annual Meeting to capitalize on these efforts.

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The Past President's Message
Linnea Wahl

If you didn’t already know it, this summer’s annual meeting of the Health Physics Society will remind you of the vast talent that resides in the HPS Accelerator Section. As proof, the section will sponsor not one but two lectureship awardees at the Acceleration Section special session on “Neutrons from Accelerators.” Both section members have been chosen by the HPS Awards Committee to receive G. William Morgan Lectureships: Scott Walker will discuss his work on dosimetry, measurement, and spectroscopy of high-energy neutrons, and Don Cossairt will present his lecture titled “Chadwick’s Neutron and the Role of New Particles in Accelerator Health Physics.” Congratulations to Scott and Don.


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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


Mike Grissom, Stanford Linear Accelerator, Retired

Rich Brey, Idaho State University

Past President:
Linnea Wahl, Berkeley National Lab

Mike Sandvig, Idaho National Lab

Steve Frey, SLAC National Accelerator Lab, retired

Newsletter Editor:
Keith Heinzelman, Berkeley National Lab

Sam Baker, Argonne National Lab


Eric Burgett, Idaho State University

Lorraine Marceau-Day, Louisiana State University

Elsa Nimmo, University of California, Berkeley

Reg Ronningen, Michigan State University

Jack Topper, Livermore National Lab


J-PARC Post-Earthquake Status

Mike Grissom

The following notes provided to the Japan Proton Accelerator Research Complex (J-PARC) users’ community update the post-earthquake facility’s status. I’m sure we all share the sentiment that exists on many websites around the world today: “We would like to express our deep sympathy to the people suffering damage by the Tohoku-Chihou-Taiheiyo-Oki Earthquake.” The good news is that as of April 4, 2011 no one was killed or badly injured, the bad news is the research program is on indefinite hold.

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Dr. Ralph Thomas to Receive 2011 HPS Founders Award
Linnea Wahl

Dr. Ralph Thomas, a founding member and second president of the Health Physics Society (HPS) Accelerator Section, has been named as the next recipient of the HPS Founders Award. This prestigious award is presented to recognize exceptional contributions to the health physics profession or the HPS over a lifetime of service to the profession. Dr. Thomas is deeply deserving of this award and joins other notable recipients of the Founders Award such as H. Wade Patterson and J. Newell Stannard.

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From the Nominations Committee Chair
Scott Schwahn

Dear Colleagues,

The Nominations Committee is still actively seeking nominations for Accelerator Section Officers. We have plenty of members willing to serve as Directors, but need some additional brave souls to consider running for Executive Committee positions: President-Elect, Secretary, and Newsletter Editor.

 The President-Elect position is for a three-year term (President-Elect transitions to President and Past-President positions with some responsibility in each position). The Secretary position is for two years, and the Newsletter Editor is for one year.

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Accelerator Session at the HPS 2011 Midyear Meeting in Charleston, S.C.
Sam Baker

Sam Baker from Argonne National Laboratory and Roger Moroney from Siemens co-chaired the Accelerator Session at the HPS Midyear Meeting on Wednesday, February 9.  There were eight presentations on accelerator radiation measurements.  The co-chairs spoke first: Sam discussed measurements made during the commissioning of the fission fragment source at Argonne’s ATLAS accelerator.  Roger then quantified the induced radioactivity for a compact 11 MeV self-shielded cyclotron to determine the necessary decommissioning funding.

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News from KEK, High Energy Accelerator Research Organization, Tsukuba, Japan

Due to a heavy earthquake on March 11 in Japan, no person was injured in KEK. We found only two radiation monitors were broken in the building of a 1.3 GeV electron linac. We found 87 monitors are not damaged, though we didn’t test 45 ones yet. Four Ge detectors were damaged. One was placed in a Pb shield. About half of Pb blocks were placed above an acrylic plate, and they slipped off aside. Due to an electric power failure in KEK, our radiation monitors did not work. But some at the KEK site boundary were powered from outside. In early morning on March 15, we found a steep increase of gamma-ray dose rate. KEK is located at 160 km distance from Fukushima nuclear power plants. KEK, in conjunction with National Institute for Environmental Study (NIES), measured airborne radioactive-nuclide using a Ge detector. I-131 and Te-132 were found. These results are shown in

Gamma-ray dose rates increased on the 15th and 16th, and 20-22th. Now it decreases a little.

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