It is an object of the present invention to make it possible to grasp the number of terminals, which are planned to receive data of an MBMS service, accurately in an RNC even if movement of a radio terminal between RNCs occurs. This molten alloy is rapidly cooled by a strip casting process in which the alloy is fed onto a chill roller, rotating at a peripheral velocity of 3 ms to less than 20 ms, at a feeding rate per unit contact width of 0. The functional endgroup is responsible for the binding to the metal element.