Administrative Regulations for Radioactive Material and Equipment Capable of Producing Ionizing Radiation and Associated Practice Article 55

The stipulated radiation survey report, smear test report, monitoring records of liquid waste samples, measuring records of workplace and periodic check records shall all be retained for five years.
中文原文 放射性物質與可發生游離輻射設備及其輻射作業管理辦法第55條
本辦法規定之測試報告、擦拭報告、廢水樣品偵測紀錄、工作場所偵測紀錄及定期查核紀錄,應保存五年。

English translation for reference only; the Chinese text prevails. Not legal advice.