Systems, methods, and devices for a television-based bill payment system are disclosed. Peptidylglycine \u03b1-amidating monooxygenase is a preferred enzyme for catalyzing the conversion. 9 mol %; and an alkylene oxide adduct of a polyvalent alcohol containing 5 to 9 moles of an alkylene oxide per 1 mole of the polyvalent alcohol. As a result, charge leakage between the floating gate and control gate is reduced. Since the radiation detectors are not only arranged in the axial direction and circumferential direction of the through-hole but also arrayed in the radial direction, it is possible to obtain accurate information about a \u03b3-ray arrival position in the radial direction of the through-hole.