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A means of transmuting key long-lived nuclear wastes, primarily the minor actinides (Np, Am, Cm) and iodine, using a hybrid proton accelerator and sub-critical lattice, is proposed. By partitioning the components of the light water reactor (LWR) spent fuel and by transmuting key elements, such as the plutonium, the minor actinides, and a few of the long-lived fission products, some of the most significant challenges in building a waste repository can be substantially reduced. The proposed machine, based on the described PHOENIX Concept, would transmute the minor actinides and the iodine produced by 75 LWRs, and would generate usable electricity (beyond that required to run the large accelerator) of 850 MW e. 1.

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A theoretical analysis is presented from which it is concluded that transient partial deuteration of body water for neutron capture therapy would significantly enhance radiation produced by the neutron-boron reaction at the deep margins of brain tumours and reduce effective gamma radiation to normal brain tissues by 50% or more. The analysis deals only with totally thermalised incident neutrons.

The requirements and performance goals for the collimators are to reduce the uncontrolled beam loss by 2x104, absorb 2 kW of deposited heat, and minimize production and leakage of secondary radiation. In order to meet these requirements a self-shielding collimator configuration consisting of a layered structure was designed. The front layers (in the direction of the proton beam) are relatively transparent to the protons, and become progressively less transparent (blacker) with depth into the collimator. In addition, a high density (iron) shield is added around the outside. The protons will be stopped in the center of the collimator, and thus the bulk of the stxondary particles are generated at this location. The conceptual design described, the method of analysis discussed, and preliminary performance parameters outlined.

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