Provided is a processing method for radioactive substances, wherein: radioactive substance is brought in contact with an adsorption material; the radioactive substance is adsorbed by the adsorption material; and the adsorption material having adsorbed the radioactive substance is combusted. The adsorption material comprises a carrier and an adsorption substance that is supported by the carrier and adsorbs the radioactive substance. Both the carrier and the adsorption substance comprise an organic material.
