David Hunter, MSc., DABR., Managing Member
David is Board Certified in Medical Nuclear Physics, American Board of Radiology, with more than 30 years experience in Diagnostic Radiology and Nuclear Medicine. He started his career in medical physics as an Instructor, Bowman Gray School of Medicine, Department of Nuclear Medicine, completed a 20-year career with the U.S. Air Force in various operational medical and health physics positions. He is a member of The American College of Radiology, American Association of Physicists in Medicine, Health Physics Society, Society of Nuclear Medicine, ASRT, and ARRT.
Voice: 505.341.4994
Cell: 505.263.9182
Fax: 505.341.4993
E-mail: david @ riophysics.com
Diana H. Hunter, RN, Managing Member
Diana is the co-founder of RIO® Grande Radiological Physics Group, LLC. She is a Registered Nurse (RN) with over 19 years of professional nursing and management experience. Diana established the overall business structure for RIO® Physics to include all contract templates, financial planning and accountability, legal and insurance documentation, and new business development. Through her vision and leadership, RIO® Physics was able to expand beyond the borders of New Mexico and stretch across the United States from California to New York in providing medical physics support to our Medical Cyclotron clients.
During her service to the United States Air Force as a military spouse, Diana provided valuable assistance to the Department of Defense Schools and family services programs at military stations through the United States, Republic of the Philippines, and Okinawa, Japan. She was a Guest Instructor for the Language Institute, Okinawa Prefecture, Okinawa, Japan, in basic medical English terminology for both physicians and nursing staff.
E-mail: diana @ riophysics.com
David E. Hunter, AE, Director of Operations
David started his career as an Avionics Electrician with the United States Navy and later moved into Special Operations. He separated from the USN, after 7-years of service, with an honorable discharge. David maintains over 30 instruments to include: beta/gamma, micro R meters, ion chamber units, alpha meters, variety of NaI(Tl) probes to include 5-inch FIDLER probes, medical Multi-Channel Analyzer thyroid uptake probe, and an ORTEC DigiDart MCA with a High Purity Germanium detector system.
David provided key operational field support during radiological environmental characterization projects at Johnston Atoll and several other locations in the US. He assists the physicist with radiation safety audits for our nuclear medicine and routine medical x-ray acceptance testing and annual surveys. David provides instructional support for the Radiation Safety Officers Course, Quality Management, CT Cross trainer Course, and the Medical Cyclotron Operations Course.
David was the on-site operations manager during the Decommissioning and Decontamination of the GE PETtrace Medical Cyclotron. He provided all instrumentation and conducted the initial characterization surveys to establish our radiation safety operational criteria for personnel on-site. David coordinated the logistics for the removal and subsequent loading and transportation of the cyclotron and all associated components.
Voice: 505.341.4994
Cell: 505.417.9152
Fax: 505.341.4993
E-mail: david2 @ riophysics.com
Alan L. Graham, Senior Health Physics Technician
Alan is a Certified Radiation Control Technician (Department of Energy) and integral part of the RIO® Physics Radiation Protection team with a philosophy devoted to professionalism, quality job performance, and integrity. He brings 20-plus years of operational health physics in the areas of accelerator radiation safety operations, nuclear power plant, radiochemistry, air quality measurements, and instrumentation calibration. Alan is extensively trained in Emergency Management and GSEP response, working with FEMA, the Illinois Department of Nuclear Safety, and the U.S. NRC. Alan is also fluent in Spanish.
Minh H. Phan, Operations Director, Nuclear Medicine, PET/CT and CT
Minh is board certified in Nuclear Medicine Technology by both the Nuclear Medicine Technology Certification Board and the American Registry of Radiologic Technologists for Nuclear Medicine; and is board certified by the American Registry of Radiologic Technologist for Computed Tomography. Minh provides PRN nuclear medicine support to local area hospitals. He provides radiation safety audits for our nuclear medicine clients throughout the state and is a key instructor in our radiation safety officer course and the CT Cross Training Course. During our Radiation safety Officers Course, Minh provides key lab presentations in the areas of Camera QC, injections, radiopharmacy dosing and computer dispensing, computer processing, radiation safety surveys, dose calibrator QC, and uptake probe QC and bioassay.
Richard H. Olsher, MS, CHP, Associate Member
Richard started is career in Health Physics in 1970 with the Atomic Energy Commission, Savannah River Operations Office, Savannah, GA. His experiences included time with the US Army Environmental Hygiene Agency, Bureau of Radiological Health, and in 1978 Richard joined the Los Alamos National Laboratory and retired in January 10, 2008.
Richard brings 20 years experience in application of Monte Carlo radiation transport codes, including MCNP and MCNPX, to solve a variety of problems in shielding and dosimetry.
During his tenure at the Los Alamos National Laboratory, Richard developed neutron and photon field calibration procedures for the Los Alamos radiation instrument calibration facility. He holds two US patents in the neutron radiation instrumentation field:
Patent #5,578,830 (November 26, 1996): Wide Energy Neutron Detection Instrument (WENDI), and
Patent #6,529,573 (March 4, 2003): Proton Recoil Scintillator Neutron Rem Meter (PRESCILA).
He has performed a variety of neutron/photon shielding, skyshine, and maze streaming calculations for Los Alamos facilities, including the Dual Axis Radiographic Hydrotest (DARHT) linear accelerators, Antares and KrF laser fusion programs, TRU waste vitrification, and numerous x-ray sources. He has performed a variety of coupled electron/photon dosimetry calculations and instrument simulations in support of Los Alamos operations, using the Monte Carlo codes LAHET, MCNP, and MCNPX.
Richard developed the Los Alamos Practical MCNP course, and has taught the course since its inception in 1996 at Los Alamos and other offsite venues. This course has been awarded 32 continuing education credits by the American Board of Health Physics.
L. Scott Walker, MS, CHP, Guest Instructor
Scott has 30-years of Operational Health Physics experience in Uranium Mill Operations and since 1990 has been a key member at the Los Alamos Neutron Science Center (LANSCE) Accelerator Health Physics staff. He is actively involved with the Accelerator Section of the Health Physics Society and currently the editor of the Accelerator Section sponsored Accelerator Radiation Safety Newsletter. In addition, Scott is co-chairman of the ANSI N43 accelerator safety committee. The committee is nearing completion of a comprehensive accelerator safety standard, which will provide much needed radiation safety guidance for the medical cyclotron community. Scott was elected as the delegate of the Accelerator Section to the International Radiation Protection Association 12, meeting in Buenos Ares, Argentina in October 2008.
Scott is our key guest speaker for the Medical Cyclotron Operations Course. His extensive experience of the radiation hazards associated with particle accelerators, safety interlocks, activation analysis, contamination control, and radioactive source accountability offer a fresh start to this exciting field.
In addition, Scott has actively pursued research in the methods of high energy neutron measurement since 1994 and has presented about 40 papers at a variety of national and international meetings since that time.
