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Meeting Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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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The U.S. Million Person Study of Low-Dose-Rate Health Effects
There is a critical knowledge gap regarding the health consequences of exposure to radiation received gradually over time. While there is a plethora of studies on the risks of adverse outcomes from both acute and high-dose exposures, including the landmark study of atomic bomb survivors, these are not characteristic of the chronic exposure to low-dose radiation encountered in occupational and public settings. In addition, smaller cohorts have limited numbers leading to reduced statistical power.
Naphtali M. Mokgalapa, Tushar K. Ghosh, Robert V. Tompson, Sudarshan K. Loyalka
Nuclear Technology | Volume 194 | Number 3 | June 2016 | Pages 353-368
Technical Paper | doi.org/10.13182/NT15-106
Articles are hosted by Taylor and Francis Online.
A methodology is developed to measure the adhesion force and the work of adhesion between aerosols generated in very-high-temperature reactors (VHTRs) and interacting with structural materials. The method uses an interactive system of a silver particle interacting with Haynes 230 (H230) surfaces, compares the measured data with theoretical values, and uses an atomic force microscope in an air environment glove box with ambient temperature of 20.27°C and relative humidity of 34.97%. The adhesion force data are obtained for a silver particle interacting with H230 under four different surface conditions including “as received” and after oxidation for 5, 10, and 15 min, respectively. It was found that the JKR (Johnson-Kendall-Roberts) theory predicted values that were up to three orders of magnitude higher than the experimental data. In contrast, the inclusion of surface roughness from both the particle and H230 samples in the calculations produced results that are one order of magnitude higher than the experimental data. These comparisons provide insight into the significant influence that surface roughness has on adhesion force. A range of values of 0.02 to 0.3 μN was obtained from the adhesion force distributions of measured data that can be used as bounds on forces that can be produced in a silver-H230 interactive system.