At refineries and complexes, we use radioactive substances in analysis equipment and other machinery. Based on laws related to regulating radioactive isotopes, we have established internal regulations for handling these substances and properly manage them. We have taken such measures as shielding employees with protective gloves, garments, and masks, as well as providing sufficient preparation, including education and training in operational procedures, to complete operations quickly and minimize the time they are exposed to radiation. In addition, to manage the health and safety of the people handling the substances, we prohibit unauthorized entry into managed areas, measure radiation on the border of managed areas (twice annually), manage the exposure of employees who enter managed areas (for example, requiring them to wear personal exposure monitors), and radioactive operation employees receive two health checkups per year. Furthermore, when disposing of waste that includes radioactive substances, we contract an operator that has permits to appropriately dispose of the waste. Furthermore, the radioactive substances handled by Idemitsu are not enough to cause exposure in local communities.