Radioactive waste: what it is, classification and management

Radioactive waste, also known as radioactive waste or nuclear waste, is materials that contain radioactive or radioactive substances. These materials are the result of anthropogenic activities involving the generation or manipulation of nuclear substances, such as nuclear energy production in nuclear plants, nuclear weapons manufacturing, nuclear research, and nuclear medicine.

Radioactive waste can take various forms, including solids, liquids or gases, and its level of radioactivity can vary from low to extremely high, depending on its origin and composition. The radioactivity of these wastes comes from the unstable nuclei of atoms that emit subatomic particles and/or electromagnetic radiation in the form of alpha, beta or gamma rays.

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Radioactive waste is classified into several categories according to its level of radioactivity, its origin and its properties. Classifications may vary depending on the current rules and regulations of each country. Below is a general ranking.

Very low activity waste (MBAR)

• These wastes contain low levels of radioactivity and are usually generated in medical and research activities and in some industrial applications.
• They may include contaminated clothing, gloves, glass, paper, and other low-radioactive waste materials.
• It can generally be managed as conventional waste, although sometimes additional precautions are required.

Low and medium activity waste (LBMA)

• These wastes have more significant levels of radioactivity and can be generated in the nuclear industry, nuclear medicine, and the decommissioning of nuclear facilities.
• They include materials such as worn-out nuclear plant components, radioactive filters, and some materials used in medical applications.
• They usually require more careful handling and are often stored in facilities specifically designed for this.

High activity waste (HAA)

• These wastes are highly radioactive and come mainly from spent nuclear fuels and highly radioactive waste generated in the operation of nuclear plants.
• They require extremely safe handling and are stored in specially designed containers and deep underground locations, such as deep geological repositories.

Transuranic waste (TRU)

• These wastes contain chemical elements heavier than uranium, such as plutonium.
• They are generated mainly in the production and dismantling of nuclear weapons, as well as in the operation of nuclear plants.
• They are stored in special containers and can be sent to transuranic waste final disposal facilities.

Highly radioactive short-lived waste (SLLW)

• This waste is highly radioactive, but has a short lifespan in terms of radioactivity.
• Some examples are chemicals used in nuclear medicine.
• They are usually stored for a limited time before disposal.

Research and development (R&D) waste

• These wastes can vary in radioactivity and nature, and come from nuclear research activities and the development of new nuclear technologies.
• They are managed according to their level of radioactivity and specific properties.

Radioactive waste management is a necessary process that involves a series of steps designed to ensure the safety of people and the environment. These are the steps, in general, to follow for good radioactive waste management:

1. Generation of radioactive waste: Radioactive waste is generated in various activities, such as nuclear power generation, nuclear medicine, nuclear research, industry and the decommissioning of nuclear facilities.
2. Classification: Radioactive waste is classified according to its level of radioactivity and its specific properties, as mentioned above in the classification of radioactive waste.
3. Temporary storage: They are usually stored temporarily in facilities designed to keep them isolated and protected. This may include sealed containers and secure storage areas at nuclear facilities.
4. Safe transportation: When necessary, radioactive waste is transported from its generation site to storage or disposal facilities, using containers and vehicles specifically designed for this purpose. Strict transportation regulations are followed to ensure safety.
5. Final disposal: it is a highly controlled and regulated process. One of the options that exists is deep geological deposition, which involves placing waste in deep geological formations, such as salt or rock deposits, where it is expected to be isolated from the surface for thousands of years. In some cases, low and medium level waste can be processed and conditioned before final disposal to reduce its volume and radiological risk.
6. Monitoring and Tracking: After final disposal, a long-term monitoring system is implemented to evaluate the safety and environmental impact of deep geological deposits or any other disposal methods. This ensures that there are no radioactive leaks and that safety standards are met over time.
7. Regulation and supervision: Radioactive waste management is subject to government regulations and supervision in most countries. Regulatory agencies ensure that safety regulations are met and public health and the environment are protected.
8. Public education and awareness: Open and transparent communication with the public is essential to gaining their trust and understanding of radioactive waste management. This includes education about the risks and safety measures involved.

Radioactive waste management is a highly technical and regulated process that requires a multidisciplinary approach and the cooperation of various stakeholders, including governments, the nuclear industry and the scientific community. The main goal is to ensure long-term safety and minimize risks associated with radiation.

Now that you know what radioactive waste is and know its classification and management, we invite you to read this article on Radioactive Contamination: causes, consequences and solutions.

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