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3 Radiation Physics Division
Pages 14-20

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From page 14...
... The quality of the work conducted by the Dosimetry Group is excellent, as demonstrated by the streamlined practices for maintaining the existing radiation dosimetry standards while anticipating new approaches to meeting calibration standards in emergent and in-demand fields such as brachytherapy calibration and electron beam calibration. While the activities are predominantly service-oriented, meeting calibration needs for critical programs and activities supported by associated regulations, the group has demonstrated technical accomplishments in designing and building a new therapy-level, gamma-radiation dosimetry calibration facility that improves NIST's ability to deliver state-of-the-art measurement capabilities for air kerma and absorbed-dose-to-water calibrations to a wide stakeholder base, and in pioneering research and development of new objective methods to assess image quality in security X-ray systems.
From page 15...
... The neutron beam line at the NCNR, used by the Neutron Physics Group, is the preeminent resource for cold-neutron fundamental physics in the United States, and the group is pioneering the measurement of the neutron lifetime using the beam method (to be compared to the bottle method, thereby resolving the neutron lifetime puzzle)
From page 16...
... Ongoing development of far-field interferometry using nanofabricated phase diffraction gratings aims to probe the weak gravitational force to extract the fundamental constant "G" using single neutrons with a precision comparable to the torsion balance–based experiments. To support the NIST mission relating to neutron calibrations and metrology, the group members are developing new neutron detectors.
From page 17...
... In the area of medical applications, the group developed a methodology for calibrating Ge-68 activity content in a commercially available calibration source that is traceable to a national standard for positron emission tomography isotopes, and it developed standards for the complex decay chain targeted-alpha therapy radioisotopes Ra223 and Ra-224. ADEQUACY OF RESOURCES Maintenance of facilities and infrastructure is a necessary foundation for mission accomplishment, as exemplified by the modernization project for Building 245, one of the world's premier laboratories for ionizing radiation measurement science and research.
From page 18...
... Expanded engagement with university partners, stakeholder programs, and international counterparts resulting in joint publication would also be beneficial. Engagement with professional societies could help promote participation in the Council on Ionizing Radiation Measurements and Standards by students, postdoctoral researchers, and faculty.
From page 19...
... GENERAL CONCLUSIONS AND RECOMMENDATIONS The Dosimetry Group has made major contributions to improved precision of dosimetry metrics through Monte Carlo computation improvements, nuclear-data science, and detection science, which in aggregate have greatly contributed to the precision of dosimetry measurement. Expanded dissemination of this knowledge outside NIST, through greater engagement with university partners, and international stakeholders, would accelerate widespread application of this outstanding technology.
From page 20...
... The group is publishing and disseminating information on new approaches for determining the absolute activity of a radionuclide. The group is fulfilling its mission of advancing measurement science and providing standards for the use of radioactive materials in medicine and industry.


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