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This term is synonymous with radiotherapy apparatus but its use in medical work is normally limited to equipment delivering electromagnetic radiations up to the ultraviolet range, and is most commonly applied to phototherapy. In some definitions actinotherapy relates to chemical changes brought about by radiation therapy but in physiotherapy this aspect is not usually stressed since the therapy is mainly intended to impart heat to the tissues. See also Short-wave diathermy, Phototherapy, Infrared lamp, and Ultraviolet treatment unit.
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