Applications of Research Reactors (IAEA TECDOC-1234)

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2. Reactor facilities required The stones are batch irradiated in containers. At one facility a batch consists of about 2 kg of stones. Since only fast neutron irradiations are desired, the containers or the irradiation facility are often covered with Cd or boron. Because the temperature during irradiation must be controlled, some method of cooling the stones is necessary. If the temperature of the gemstones approaches 300oC the damage to the topaz will anneal and de-coloration will occur. In addition, if the temperature is too high the stones will be prone to flaking during post-irradiation handling.

First, since BNCT is still in the research phase, and since the efficacy of the treatment is still unproven, many people believe that there are enough facilities currently available for the necessary studies and that additional facilities are not needed at this point. Second, even if BNCT eventually becomes a viable treatment option, a market analysis should be performed to determine the number of potential candidates that would be available for treatment. An example of a simplified approach to the study follows.

Neutron irradiations Fast and thermal neutron irradiations are sometimes performed to determine the effects of irradiation on materials. , blanket testing, first wall materials, plasma facing materials, windows for microwave heating systems, breeder blanket materials). 1. Flux/fluence required The thermal neutron flux required to perform these irradiations in a reasonable time period should be greater than 1013 n cm–2 s–1. In addition, the fast neutron flux needs to be greater than 5 × 1013 n cm–2 s–1.

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