Activation counter using liquid light-guide for dosimetry of neutron burst

We have proposed a novel activation counter using a liquid light-guide (LLG) and a suitable group of activation foils for dosimetry of neutron burst. The LLG that works as a position sensitive radiation detector are covered with appropriate activation materials whose threshold energies are different to each other with a distance of a few tens of cm between them. Since the induced activities of activation foils irradiated by neutrons are detected independently by the LLG, the neutron energy distribution and its flux can be derived from the activities and their neutron cross-sections by numerical de-convolution calculation. The proposed activation counter would be suitable for the dosimetry of intense neutron burst including fast neutrons because the LLG and the activation foils are much tolerance for radiation damage. We have designed the system configuration of the proposed activation counter. The preliminary results of the responses to thermal and fast neutron are obtained successfully. (author)