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Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Latest News
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Per Lindén, Gudmar Grosshög, Imre Pázsit
Nuclear Technology | Volume 124 | Number 1 | October 1998 | Pages 31-51
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT98-A2907
Articles are hosted by Taylor and Francis Online.
Flow measurements were performed with pulsed-neutron activation (PNA) in a specially designed test loop. A stationary neutron generator was used as a neutron source, and the detection of the induced 16N activity in the flow was performed by two bismuth germanate detectors. Stable flow could be produced in the loop and measured with high precision (~0.5% error) by a scale and a stopwatch method, concurrent with the PNA measurement. A series of measurements have been made by varying the position of the detectors, the flow velocity, etc. The accuracy of the various time-averaging methods that are used in the evaluation of the PNA measurement could be assessed by a comparison with the flow calibration data. In particular, the dependence of the error of the different PNA evaluation methods as functions of detector spacing and flow velocity was determined. The measurements are part of a program that seeks to develop a flowmeter suitable for practical applications, which will include backing up the method with flow calculation and signal-processing methods such as neural networks for off-line calibration of the equipment.