Results of individual monitoring of occupied workers based on the doses estimations carried out by Central Laboratory for Radiological Protection (CLOR) in Warsaw has been presented. In 2011, about 5000 persons from 330 institutions were monitored. Monitoring service in CLOR is based on two doses assessment methods, Kodak films and MCP-N thermo luminescent detectors. Presented results show that 97% of registered doses were less than 1 mSv and only about 0.1% of assigned doses were higher than 20 mSv. The monitored workers were divided in four groups: medical, scientific, industrial and others. Six cases of excess of the 20 mSv annual dose limit were registered in medical, three in scientific and three in industrial group. The average annual dose in each particular group was calculated: 0.51 mSv in medical, 0.62 mSv in scientific, 0.48 mSv in industrial and 0.44 mSv in others.