Ionising radiation in the context of Electronvolt

The European Atomic Energy Community (EAEC or EURATOM) is an international organization established by the Euratom Treaty of 1957 with the original purpose of creating a specialist market for nuclear power in Europe, by developing nuclear energy and distributing it to its member states while selling the surplus to non-member states. Having become one of the three European Communities alongside the European Coal and Steel Community and the European Economic Community following the merger of their executive bodies in 1967, the Euratom is de facto under the authority of the European Union (EU) but remains de jure a separate organization.

It is legally distinct from the European Union although it has the same membership, and is governed by many of the EU's institutions; but it is the only remaining community organization that is independent of the EU and therefore outside the regulatory control of the European Parliament. Over the years its scope has been increased to cover a variety of areas associated with nuclear power and ionising radiation as diverse as safeguarding of nuclear materials, radiation protection, coordinating EU members' nuclear research programmes for peaceful purposes, and construction of the International Fusion Reactor.

The International Bureau of Weights and Measures (French: Bureau international des poids et mesures, BIPM) is an intergovernmental organisation, through which its 64 member-states act on measurement standards in areas including chemistry, ionising radiation, physical metrology, as well as the International System of Units (SI) and Coordinated Universal Time (UTC). It is headquartered in the Pavillon de Breteuil in Saint-Cloud, near Paris, France. The organisation has been referred to as IBWM (from its name in English) in older literature.

Irritation, in biology and physiology, is a state of inflammation or painful reaction to allergy or cell-lining damage. A stimulus or agent which induces the state of irritation is an irritant. Irritants are typically thought of as chemical agents (for example phenol and capsaicin) but mechanical, thermal (heat), and radiative stimuli (for example ultraviolet light or ionising radiations) can also be irritants. Irritation also has non-clinical usages referring to bothersome physical or psychological pain or discomfort.

Irritation can also be induced by some allergic response due to exposure of some allergens for example contact dermatitis, irritation of mucosal membranes and pruritus. Mucosal membrane is the most common site of irritation because it contains secretory glands that release mucus which attracts the allergens due to its sticky nature.