公开(公告)号：US20210270978A1

公开(公告)日：2021-09-02

申请号：US17255210

申请日：2019-06-28

Applicant: ISP Investments LLC

Inventor： Rob CROHN ,  Shih HSIAO-YI

IPC: G01T1/08

Abstract: This present disclosure provides a multi-ply radiation dosage indicator, which includes a first ply having two visible readable indicia thereon. The dual radiation sensitive zones are capable of changing opacity in response to exposure radiation. Each radiation sensitive zone can respond to an irradiation dose in tandem or independent of one another. Once the radiation sensitive zone exceeds the design exposure threshold, the visibility of the indicia is altered thereby providing an indication of irradiation exposure. The radiation sensitive zone may either be transparent or opaque and can change its opacity in response to exposure to radiation exceeding a predetermined threshold so as to change the visibility of the indicia.