There you can actually do sort of substance analysis which you can't really do by conventional x-ray."

VOA: standard.2010.05.05

He says it is increasingly important to do this analysis in connection with urbanization because more than half of the world population lives in urban areas.

VOA: standard.2009.03.23

But he added that careful analysis is required, and that actions taken by Iran's government do not lend credence to its claims of a free and fair vote.

VOA: standard.2009.06.14