ODA infrastructure and utilities director Simon Wright said the materials posed no health risk to either site workers or the public.
Small amounts of material were found in pockets of the north of the site, an area that for 100 years was used as a landfill and will become the Velopark, hosting the cycling and BMX events in 2012.
The most significant find was a 100mm gauge dial face painted with radium based luminous paint.
"We must keep these finds in perspective," said Wright.
"Exposure to the dial would be similar to [the radiation levels passengers are exposed to when] taking a flight to Europe."
The dial was unearthed by remediation contractor Morrison's specialist contractor Nukem in April and is currently isolated. The Health and Safety executive has been informed and the ODA is now working with Environment Agency to establish a safe place off-site to dispose of the material.
Wright added that the stopping of remediation work in the areas where radium paint-covered materials have been found will not delay the overall remediation programme.