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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Fusion Science and Technology
Latest News
The RAIN scale: A good intention that falls short
Radiation protection specialists agree that clear communication of radiation risks remains a vexing challenge that cannot be solved solely by finding new ways to convey technical information.
Earlier this year, an article in Nuclear News described a new radiation risk communication tool, known as the Radiation Index, or, RAIN (“Let it RAIN: A new approach to radiation communication,” NN, Jan. 2025, p. 36). The authors of the article created the RAIN scale to improve radiation risk communication to the general public who are not well-versed in important aspects of radiation exposures, including radiation dose quantities, units, and values; associated health consequences; and the benefits derived from radiation exposures.
R. R. Paguio, S. P. Paguio, C. A. Frederick, A. Nikroo, O. Acenas
Fusion Science and Technology | Volume 49 | Number 4 | May 2006 | Pages 743-749
Technical Paper | Target Fabrication | doi.org/10.13182/FST06-A1195
Articles are hosted by Taylor and Francis Online.
Poly(-methylstyrene) (PAMS) shells are made by microencapsulation and used in the fabrication of a large variety of targets for the inertial confinement fusion (ICF) program. Although this process has previously been developed into production mode, the yield of shells with acceptable sphericity and wall uniformity in the OMEGA size range (800-1000 m) has been poor (~ 18%). We have made improvements in the yield of these shells by modifying the composition of the outer water solution (W2) in the microencapsulation emulsion. This improvement was achieved by increasing the concentration of Poly Vinyl Alcohol (PVA) from 0.3% to 1.0% and an addition of 0.1% Poly Acrylic Acid (PAA). These modifications were aimed at increasing the interfacial surface tension in the emulsion but also appear to have played a role in density matching the components in the PAMS emulsion. These modifications improved the out of round (OOR) and non-concentricity (NC) of the PAMS mandrels resulting in as increase in the yield of target quality batches based on these basic criteria from 18% to over 80%. Meanwhile, the vacuole content and the surface finish of the PAMS shells were not adversely affected by these changes.