| CPC G01T 1/2018 (2013.01) [A61N 5/1048 (2013.01); H01J 37/244 (2013.01); H10F 19/40 (2025.01); A61N 2005/1087 (2013.01); H01J 2237/24507 (2013.01)] | 10 Claims |

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1. A device for detecting therapeutic radiation, comprising:
a single optical disk that is formed of a water-equivalent material, disposed perpendicular to a first direction in which the radiation is incident, and converting the radiation into visible light;
a single solar cell that is disposed on one side of the optical disk and converts the visible light into an electrical signal; and
processing circuitry configured to collect and process the electrical signal outputted from the solar cell,
wherein the optical disk is movably disposed in a first direction within a housing by a drive module.
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