2024 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources

2023 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources

2022 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources

2021 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources

2020 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources

2019 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources

2016 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources

2015 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources

2014 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources

2010 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources

2009 10 CFR 31.8 – Americium-241 and radium-226 in the form of calibration or reference sources