INTERNATIONAL ACCELERATOR RADIOLOGICAL PROTECTION E-MAIL (IARPE) NEWSLETTER "The Official Publication of the Accelerator Section of the Health Physics Society" March/April 1999 Circulation: 258 Vol. 8, #2 OFFICERS President: Steve Musolino, BNL {musolino@bnl.gov } President-Elect: Joe McDonald, PNNL {jc_mcdonald@ccmail.pnl.gov} Past President: Vaclav Vylet {vylet001@mc.duke.edu} Secretary: Scott Schwahn, Jefferson Lab {schwahn@jlab.org} Treasurer: Gerry Fallon, MIT {fallon@bates.mit.edu} Newsletter Editor: Elaine Marshall, FNAL {emarshall@fnal.gov} Directors: Wes Dunn, International Isotopes (1999) {Wdunn@intiso.com} Henry Kahnhauser, BNL (1999) {kahnhaus@bnl.gov} Bob May, Jefferson Labs (2000) {may@jlab.org} Keith Welch, Jefferson Labs (2000) {welch@jlab.org} Mike Grissom, SLAC (2001) {mikeg@slac.stanford.edu} Marcia Torres, ANL-E (2001) {mtorres@anl.gov} FROM THE PRESIDENT IRPA Delegation The Accelerator Section petitioned the HPS Board of Directors to revise the procedures to the selection of delegates to the IRPA General Assembly several years ago. At the Board meeting held in January, the recommendation was approved, allowing for the nomination of candidates for the position of delegate by a Section or Chapter. At this time, I am soliciting names of individuals that would be interested in serving in this capacity. The Accelerator Section Board will then vote to determine the Section nominee. Steve FROM THE NEWSLETTER EDITOR Some months back, I placed the newsletter on the Web at http://www-esh.fnal.gov/IARPE/. However, I have recently been made aware that several of you have had problems accessing the information through that forum. Let me apologize. I am working to correct the situation. Please keep me posted if you have additional problems at emarshall@fnal.gov. Elaine NEWS FROM THE SECRETARY As some of you may know, there are two listservs for communication within the HPS Accelerator Section: IARPE and ACCSEC. Traditionally, they have both been open to anyone who would like to join. IARPE is a bimonthly distribution for health physics news in the accelerator community worldwide. It is not a discussion group, rather it is an online newsletter. The ACCSEC listserv was set up as a forum for discussion and for HPS Accelerator Section business. Earlier this year, the Accelerator Section officers discussed how best to use these two resources. Some points considered were the listservs' ease of use, current utilization, and benefits to Section members. A consensus was reached to limit the ACCSEC distribution to HPS Accelerator Section members, as it was not being used for discussions and it would make a convenient tool for dissemination of Section business information. We took no action on IARPE and it is still open to all who would like to subscribe. In addition, the Accelerator Section membership roll was audited against both lists. To my surprise, less than half of the current Accelerator Section members were subscribed to ACCSEC, and a good share were not subscribed to IARPE. Following the discussion and analysis, the ACCSEC distribution was limited to only HPS Accelerator Section membership and the IARPE distribution was updated by adding Accelerator Section members who were not subscribed. If you have any questions or concerns about the IARPE or ACCSEC listservs or about Accelerator Section membership, please let me know. You can reach me by email at schwahn@jlab.org. Scott NEWS FROM THE NOMINATIONS COMMITTEE Nominations and elections for offices in the HPS Accelerator Section are underway. The call for nominations went out on April 5, and should have reached all Accelerator Section members by email or snail mail. If you think you are an Accelerator Section member and feel that you were missed, please let Scott Schwahn know immediately. Open positions are President-Elect, Treasurer, Newsletter Editor, and Director (2). Nominations for offices had a due date of April 20, but until the official ballots go out, last-minute nominations will be accepted. All Accelerator Section members are eligible to nominate, run for office, and vote. Scott Schwahn Chair, Nominations Committee NEWS FROM KEK 12 GeV PROTON SYNCHROTRON The tuning of the new neutrino beam facility at the KEK has started on 30th in January, 1999. This facility was designed and constructed for the long baseline neutrino oscillation experiment combining the KEK 12GeV Proton Synchrotron (the KEK-PS) and the SuperKAMIOKANDE (the SK) cosmic neutrino observatory which locates 250km far from KEK. The protons extracted from the KEK-PS were successfully transported through a 400m-length newly-constructed primary proton beam line consisted of more than 80 electromagnets, and focused onto the pion production target which is a 66 cm long aluminum rod with 2cm in diameter. The pions produced at the target were collected and focused to the forward direction by using the pulsed co-axial magnet, i.e. the magnetic horn. In order to achieve high collection efficiency, the production target itself is a part of the inner conductor of the magnetic horn. Pions thus collected were injected to the decay region and generated neutrino beam through pion --> muon + muon neutrino muon --> electron + muon neutrino + anti neutrino process. The length of the decay section is 200 m. Pions not decayed as well as protons passed through the target were absorbed at the beam dump located at the end of the decay region. This experiment will be continued for 3 - 4 years until 10E20 protons irradiate the target. The newly constructed primary proton beam line is an extension of the existing EP1 (Extracted Primary proton beam line-1, see reference 1). Since the extraction direction of the original EP1 is almost to the north, the primary proton beam was bent about 90 degree from the north to the west direction at the new extension part in order to shoot neutrinos to the exact direction to the SK. The relative direction from the KEK to the SK was very accurately surveyed (within 100 cm in length and 1" in angle) by using GPS. The neutrino beam size at the SK will be, however, about 1 km in diameter because of the unavoidable kinematic broadening of the pion decay. The most important term from the view point of radiation protection is the radio-activities generated in the soil and the underground water at around the decay region, which directly receives pions and protons passing to the beam dump. For this regulation, we fixed the thickness of the concrete shielding surrounding the decay-region by using Monte Carlo code, MARS, developed at Fermilab. In order to fix the absolute calibration factor between the Monte Carlo calculation and the actual activation rates, we have performed the soil benchmark experiment using 12GeV primary proton beam from the KEK-PS. Details of the experimental results have already been published 2). In addition we have prepared several observation wells through which we can measure the residual radioactivity in both soil and underground water at the surface of the concrete shielding surrounding the decay-region. We will continue the activity measurement until 10E20 protons on the target. References 1) K.H. Tanaka et al., Optical Design of Beam Lines at the KEK-PS New Experimental Hall. Nuclear Instruments and Methods A363(1955)114-119 2) T. Suzuki et al., Soil Shielding Benchmark Experiment and Its Simulation with MARS Using Secondary Particles Produced by 12 GeV Protons. Radiation Protection Dosimetry 78(1998)305-312 Dr. K. H. Tanaka at Institute of Particle and Nuclear Study at KEK Activity Report of Radiation Science Center In Fiscal 1997 Activity Report of Radiation Science Center of KEK in Fiscal 1997 was published as KEK Progress Report 98-5. The activity report is divided in three parts. The first part is the R&D activities reported in English and the second part is the studies related to the routine work written in Japanese. The third part is the data related our activities including awards, name of outside committees we are engaged in, workshops and symposia, publications, and funds we got. We hope that the activity report is useful for all people who are working in the field of the safety of accelerator facilities. KEK Progress Report 98-5 can be requested from me at the following address hideo.hirayama@kek.jp. Hideo Hirayama NEWS FROM CERN The first three months of 1999 at CERN were characterized by the usual compilation of RP's annual report, the yearly interviews with the staff and the writing of two voluminous reports for the Large Hadron Collider (LHC) in the framework of the French procedure for Basic Nuclear Installations (INB). In addition this period is one of the busiest one in the year for RP due to the annual shut down of CERN's accelerators. All these activities were highly perturbed by a fire that broke out during the dismantling of an old calorimeter containing plates of depleted uranium (DU). Luckily there was neither a spread of radioactivity into the environment nor any noticeable dose to persons due to the uptake of DU. The maximum was 30 microsievert whilst the dose from external radiation for the person mostly involved in the dismantling was more than ten times higher. The whole operation had been performed in a closed area built within one of CERN's big experimental halls so the spread of surface contamination outside the area remained low and was mostly caused by the intervention of the CERN fire brigade. Both the fire brigade and radiation protection did an excellent job such that damage was kept to the local area and the area was cleaned and brought back to normal operation rapidly. External experts from France were called in to help to elucidate what could have caused the outbreak of the fire but had not yet arrived upon the submittal of this report. Finally let me report that a selection board for the post of the CERN RP Group Leader took place on 6 April with the participation of 5 external and 2 internal applicants. The board identified strong candidates and I am happy to say: white smoke emerged: Habeamus ducem! At the present time names cannot be revealed but I have high hopes that the hand over of my excellent group to my successor will be without problem. Manfred Hoefert manfred.hoefert@cern.ch Update on LEP Decommissioning As you all know, LEP is operational since 1989, accelerating electrons and positrons to a maximum energy which will approach 100 GeV this year. The collider will terminate its activity at the end of next year, after nearly 11 years of routine operation. Starting in October 2000, LEP will then be dismantled and the tunnel emptied to make room for the LHC. As explained by Manfred Hoefert in the newsletters of May/June and November/December of last year, since LEP is classified as a French Nuclear Basic Installation (Installation Nucl^Âaire de Base, INB), before dismantling begins one has to assess the expected amount of induced radioactivity in the various accelerator components. The dismantling procedure will depend both on the amount of material to be treated as TFA (Tr^Ês Faiblement Actif, low level waste) and on which sectors of the machine this material is coming from. This is why it is so important to determine an upper limit for the value of specific activity which may be induced in the most common LEP materials: aluminum, copper, lead, stainless steel and the iron-laminated concrete of the dipoles. We are tackling the problem by both Monte Carlo calculations and experiments. We have irradiated samples of the above materials on the beam dumps for the whole LEP operation of 1997 and 1998 (and we are doing the same this year). The samples were analyzed by gamma spectrometry at the end of each exposure period, to determine the induced specific activity of all the produced radionuclides. The results were compared with those from Monte Carlo calculations performed with the FLUKA code using the RESNUCLE scoring option. From this we gained conversion factors from beam power lost in a given material to induced specific activity. The work is being refined and we will present the full results at the ICRS-9 conference in Tsukuba in October. Marco Silari marco.silari@cern.ch NEWS FROM CAMD CAMD, the J. Bennett Johnston Center for Advanced Microstructures and Devices at Louisiana State University has just completed an external review, conducted by a panel of four from various DOE facilities. The review went well. Work continues on a number of beamlines. We have recently commissioned a new 3M toroidal grating monochromator (TGM) beamline. A 6M TGM will become operational in late spring. This represents a collaboration between CAMD and the University of Texas. The DCM beamline continues to be highly competitive with over 30 external users from Bonn University to Brazil. To accommodate beam schedules, we have moved to 12 hour per day operations with plans to expand to 24/7 when the protein crystallography program is underway. We currently deliver beam100 hours per week at 1.3 or 1.5 GeV with optional "pull chain" shifts. These additional shifts permit the accelerator staff to come in and inject the machine, then leave while other CAMD faculty and staff monitor the stored beam. E Beamline components for the NIM have arrived and are currently being leak tested prior to final assembly, which should be finished this summer. In our spare time, we are working to commission our 7.5T wiggler and it's associated deep resist micromachining beamline. This beamline with photon energies as high as 60 KeV should be complete by summer of 1999. Funding from NIH has just been obtained for a protein crytallography beamline, which will also come off the wiggler. The accelerator staff have been working hard to upgrade the control systems, moving from three DEC computers to single PC's. This has relieved us of expensive hardware and software maintenance contracts. Changing from 1.3 to 1.5 GeV operation now requires a single mouse click. A beamline completely dedicated to beam diagnostics has been designed. Construction will begin shortly. Some of the health physics concerns for this beamline include shielding a neutron source located at the thin septum which is in direct line of sight for this proposed beamline. Unfortunately, this requires some beamline modification to accomodate the additional shielding required. To save space, we have decided to replace the concrete shielding with 5% borated polyethylene, which is easily machined and lightweight followed by lead shielding on a separate stand. I would welcome your experiences in this matter. As you may note, all of these new beamlines keep the HP staff (me) hopping. May see you at the HPS in Philly. Lorraine Day, PhD CAMD RSO WORKSHOPS AND CONFERENCES Health Physics Society 44th Annual Meeting By now, most of you should have received your copy of the preliminary program for the Annual Meeting. If you haven't noticed already, the Accelerator Section is sponsoring an oral session Tuesday morning and several members have submitted poster presentations for the session on Monday. The Accelerator Section is honored to have a Morgan Lecturer to kick-off our session. Professor Maurizio Pelliccioni Professor Maurizio Pelliccioni will be the Morgan Lecturer of the Accelerator Section Session at the Annual Meeting in Philadelphia. Professor Pelliccioni was selected because of his international reputation as an authority on radiation protection for high-energy accelerators. His work in this area has spanned more than thirty years, and we are looking forward to his presentation. Professor Pelliccioni is Head of the Radiation Protection Service of the Italian National Laboratory at Frascati, and has served in this position since 1967. He has held an academic appointment as Lecturer of Health Physics at Rome University since 1970. He has authored over 180 publications as well as 3 books on radiation protection for Italian university students. Recently, he has carried out research work on the design of rem-counters for high-energy neutron measurements at accelerators. He has also performed calculations of dose equivalent conversion coefficients for high-energy radiations. Professor Pelliccioni is a member of several national and international committees dealing with radiation protection, including the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). Overall, the meeting should prove to be very informative and give us the opportunity to interact with our colleagues. I look forward to seeing you in Philadelphia. Joe McDonald Neutron Field Spectrometry in Science and Technology Dear colleagues, An International Workshop on "Neutron Field Spectrometry in Science and Technology" sponsored by the European Commission and by the European Dosimetry Research Group (EURADOS) will take place in Pisa Italy, June 5-8, 2000. As one of the few non-Europeans on the Program Committee for the Workshop, I have been asked to help find potential participants outside Europe who would be interested in receiving the First Announcement and Call for Papers, which is now being prepared. 1) Would you like to receive an Announcement? If so, please send me an e-mail and include your postal mailing address. 2) Do you know of others at your institution or elsewhere (outside Europe) who would like to receive an announcement? If so, either forward this message to them or send me their e-mail address or other contact information. Paul Goldhagen U. S. Department of Energy Environmental Measurements Laboratory 201 Varick Street, 5th Floor New York, NY 10014-4811 voice: 212-620-3645 fax: 212-620-3600 goldhagn@eml.doe.gov 10th IRPA Congress Although the 10th IRPA Congress in Hiroshima is still more than 12 month away the Second Announcement was lately sent to all members including a Call for Papers. There will be a topical session at the conference on "Radiation Protection Issues at High Energy Accelerators". The International Program Committee asked me to present a key address that covers that topic and I feel much honored by this task that gives me the opportunity before my retirement to report on more than 31 years of experience in the field. In addition to this paper, four to six other oral presentations are envisaged. Submitted papers on this topic should be channeled to comprise two main issues: Evaluation of the appropriate radiation protection quantity in stray fields outside the shielding of accelerators and the problem of radioactive material from the accelerator environment. This latter subject has lately become somehow my hobby horse due to the future decommissioning of the LEP machine, my contacts with the French, Swiss and European authorities on that subject, and maybe due to the fact that I shall be decommissioned too. We are all facing in our community huge amounts of mostly slightly radioactive material stemming from the decommissioning of old machines and we as specialists should make proposals how to deal with this problem of both heavy and voluminous storage and possible elimination of material. Otherwise (and it has happened already) our rather special radioactive waste will be put in one basket together with nuclear waste. I encourage you to submit your abstracts according to the Call for Papers on page 11 of the Second Announcement. For a correct channeling you should identify the Accelerator Session on your abstract and it will be the International Program Committee that decides on your submitted contribution. Manfred Hoefert manfred.hoefert@cern.ch HOW TO SUBSCRIBE / UPDATE YOUR E-MAIL ADDRESS To add yourself to the mailing list for the IARPE Newsletter, send an e-mail message to listserv@slac.stanford.edu The body of your message should contain the following command: subscribe iarpe-l Please don't forget to update your e-mail address if you move, change jobs or just change your computing environment. The update consists in canceling the old by 'unsubscribe' and submitting a new subscription, as illustrated below: unsubscribe iarpe-l your_old_email_address subscribe iarpe-l end If the body of your message, as in this example, contains more than a single line/command, it is good practice to finish with the 'end' command, especially if your mailer adds a signature. If you experience problems with subscribing/updating, please send me an e-mail to emarshall@fnal.gov and I will do it for you. Elaine --------------------------------------------------------------