National standards for radiation dosimetry at AIST

The National Institute of Advanced Industrial Science and Technology (AIST) engages in the development and provision of various national standards related to radiation dose. Of these, the radiation standard research group performs studies on dose standards of X-rays, γ-rays, and β-rays. As the dose standards of X-rays and γ-rays, it provides air kerma rate, irradiation dose, and water-absorbed dose. As for the intensity of dose, various fields such as environment, protection, diagnosis, and medical treatment are covered. In the radiation protection field, this group also established the tissue absorbed-dose standards against β-rays, and started the calibration in FY2006. In the radiation treatment field, too, it has developed in recent years the dose standards for linac high-energy photon beams for medical use and brachytherapy. This paper explains these dose standards for X-rays, γ-rays, and β-rays. (A.O.)