To provide a method for, even when an article including a non-contact IC medium for performing history management is erroneously put in a microwave oven, and the non-contact IC medium is irradiated with an electromagnetic wave causing a failure, leaving the trace of the irradiation to easily determine whether or not the non-contact IC medium is normal.
An electromagnetic wave detector constituted of a conductive substance layer which generates dielectric heat due to the irradiation of an electromagnetic wave and a heat detection layer which discolors or colors by sensing heat is attached to a non-contact IC medium constituted of an antenna formed on a support body and constituted of a dielectric layer, and an IC chip connected to the antenna.
KIJIMA ATSUSHI
OZAWA TATSURO
