CBRNE event in Riga, Riga area, Latvia on Fri 25th September 2015

In September, a private individual found an industrial gauge containing a radioactive Cesium-137 source in the woods of Riga, Latvia. After referencing the internet, he reported the discovery to the State Environmental Service (SES) of the Radiation Safety Centre (RDC). After testing the undamaged, 55kg item, SES RDC inspectors affirmed that it contained high levels of radiation. The item has been handed over to the Latvian Environment, Geology and Meteorology Centre for examination. State police have begun a criminal proceeding. What sort of effect handling the radioactive item may have on the private individual is .