Released thyroid cancer patients treated with 131I may cause a radiation risk to their family members. However, no current regulations exist in Taiwan to limit the radiation dose among patients released post-treatment. This study assessed radiation exposure to caregivers of thyroid cancer patients treated with 131I to verify whether their doses exceed the 5-mSv limit per treatment session. The study population comprised 63 patients from four hospitals and their caregivers. Dose rates at a 1-m distance from patients were quantified before their release.