| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of an excessive thermal load in a target part and in an electron beam transmitting part of a casing in an electron beam irradiation device generating a positron by irradiation with an accelerated electron beam. SOLUTION: In this electron beam irradiation device, a disc-shaped target having an electron beam irradiation area made of a high atomic number and high melting point material is turned around an axis parallel to an electron beam. In this electron beam irradiation device, the target is constructed of a plurality of tantalum discs 60, each of which is formed of an inside disk 61 made of tantalum, 12 arcuate targets 63 made of tantalum, and an outer ring 65.
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