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About Us

History and mandate

The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR),was established by the General Assembly of the United Nations in 1955. Its mandate in the United Nations system is to assess and report levels and effects of exposure to ionizing radiation. Governments and organizations throughout the world rely on the Committee's estimates as the scientific basis for evaluating radiation risk and for establishing protective measures.  >>more

Committee members

The General Assembly has designated 27 countries to provide scientists as members of the Committee.   >>more

Governing principles

The Committee, at its 61st session, agreed on governing principles for the Committee's work.

Strategic direction

The Committee, at its 63rd session, agreed on strategic direction for the Committee's work beyond 2019.


Since its inception, UNSCEAR has issued 25 major publications. These authoritative reports are principal sources of information.  >>more

Programme of work

The Committee's programme of work is approved by the General Assembly, and extends typically over a 4-5 year period. The secretariat collates relevant data submitted by UN Member States, international organizations and non-governmental organizations, and engages specialists to analyse those data, to study relevant scientific literature and produce scientific evaluations. The secretariat submits the evaluations annually for scrutiny to each session of UNSCEAR, and at the end of the cycle, the substantive reviews are published.


The small secretariat in Vienna, which is functionally linked to UN Environment, organizes the annual sessions and manages the preparation of documents for the Committee's scrutiny.

UNSCEAR secretariat
Vienna International Centre
P.O. Box 500
A-1400  Vienna, AUSTRIA
Tel. +43 1 26060 4360
Tel. +43 1 26060 4122 
Fax +43 1 26060 5902




The UNSCEAR secretariat periodically offers internship positions under the UN Secretariat internship programme at the UN career portal careers.un.org. >>more

Last updated: Tuesday, 2 February 2021