Biljana Petrovic received her Diploma in Physicis at Faculty of Natural Sciences and Math, Universtiy of Banja Luka. In 2010, she joined Radiation Protection Center of PHIRS where her main activity is, but not limited to, external dosimetry. She runs the service which is one of three technical services in the country. The service is accredited according ISO 17025 since 2017 and it is the first accredited service in Bosnia and Herzegovina. She joined EURADOS in 2016 as a WG 2 member.