Results of in vivo monitoring of the witnesses of the Chernobyl accident

About 1500 people were involved in emergency operations on 26-27 April 1986 at the site of the Chernobyl; Nuclear Power Plant. They worked in different working conditions and were exposed to aerosols of different characteristics. The Chernobyl accident was the first accident in which, when the reactor core was destroyed, aerosol of the dispersed spent nuclear fuel became a significant source of internal and external exposure for a large group of people. Detailed information on the properties of the Chernobyl aerosol for the first post-accident period is absent. Therefore, results of in vivo monitoring of the witnesses of the Chernobyl accident can be an the important source of information for assessing the radiological properties of the Chernobyl aerosol.