The property of certain atomic nuclei to spontaneously emit radiation as they undergo decay, which can occur naturally or through artificial processes, affecting both the surrounding environment and biological entities.
A characteristic associated with materials that emit radiation continuously, arising from the instability of their atomic structures, often measured in terms of their potential to cause nuclear reactions or ionization in nearby matter.
Example:
もう一つの面白いエネルギー源は、放射能の廃棄物質から取り出せる熱である。
The presence of radioactive materials in the environment, which can be harmful and potentially lead to adverse health effects due to their dispersion from activities like nuclear testing or the operation of nuclear reactors.
A situation where radioactive substances accumulate on surfaces, in organisms, or throughout the ecosystem, resulting from human activities involving radioactive materials, and posing risks to health and safety.
The unintended spread of radioactive elements in various environments, which may arise from scientific research using such materials, and can lead to significant ecological and health hazards.
The unintended release of radioactive materials into the environment, often resulting from accidents or malfunctions in nuclear facilities.
The process by which radiation escapes from its containment, potentially posing health risks to living organisms and contamination to surrounding areas.
A situation where radioactive substances are emitted, leading to possible exposure to harmful radiation for individuals and ecological systems.