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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.
Satoshi Fukada, Shigeki Ono, Shigenori Suemori
Fusion Science and Technology | Volume 50 | Number 1 | July 2006 | Pages 99-106
Technical Paper | doi.org/10.13182/FST06-A1225
Articles are hosted by Taylor and Francis Online.
The overall mass-transfer process of methane decomposition on Ni surfaces and hydrogen permeation through a Ni tube was experimentally investigated to design a catalytic-permeable Ni tube reactor. This is a basic study of an impurity detritiation system to decompose tritiated methane and continuously recover tritium in a gas mixture exhausted from fusion plasma. The mass-transfer process was comparatively studied under the two conditions of an open Ni tube without any packing and a Ni tube packed with 200-240 mesh Ni particles. Results were discussed in terms of a CH4 decomposition ratio decomp and a H2 permeation ratio perm. The decomp values depended on temperature and were almost independent of the flow rate. The decomp value was correlated to the first-order reaction-rate constant. On the contrary, the perm values were in reverse proportion to the flow rate and were almost independent of temperature. The perm value was related to diffusion through a H2 concentration boundary layer formed in the vicinity of the Ni tube wall. The degradation of catalytic performance due to carbon deposition on Ni was discussed based on our experiments.