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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.
Yoshi Hirooka, Robert W. Conn, Monali J. Khandagle, Gaetan Chevalier, Toshiaki Sogabe, Teruo Matsuda, Hiroaki Ogura, Hirotaka Toyoda, Hideo Sugai
Fusion Science and Technology | Volume 19 | Number 4 | July 1991 | Pages 2059-2069
Technical Paper | Carbon Material Special | doi.org/10.13182/FST91-A29340
Articles are hosted by Taylor and Francis Online.
Newly developed bulk-boronized graphites and boronized carbon-carbon composites, with a total boron concentration ranging from 3 to 30 wt%, have been bombarded with steady-state deuterium plasmas at temperatures between 200 and 1600°C in the PISCES-B facility. The erosion yield of bulk-boronized graphite is smaller than that of pyrolytic graphite by a factor of 2 to 3 in regimes of chemical sputtering, physical sputtering, and radiation-enhanced sublimation (RES). Plasma bombardment at elevated temperatures does not noticeably alter the near-surface composition of bulk-boronized graphite. A chemical pinning effect of boron on the migration of interstitial carbon atoms is the key to the reduction of erosion due to RES. Post-bombardment thermal desorption spectroscopy indicates that bulk boronization enhances recombinative desorption of deuterium. The enhanced deuterium desorption is responsible for the suppressed chemical sputtering. Deuterium retention in bulk-boronized graphite at temperatures from room temperature to 800°C has been measured, and it is maximized at temperatures around 300°C. The maximized deuterium retention increases by a factor of 2 as the boron concentration changes from 0 to 90%.