I don't know where you got that from but it sounds like one of those apologetics from the armaments industry claiming that DU is not dangerous.
Actually the radiation from depleted uranium - 238U - is around 50% that of unprocessed uranium and is many, many times that of a typical brick. Believe me, I used to do a demonstration of the radioactivity of common substances including a handy bottle of uranium nitrate - which you used to be able to buy quite easily - and "low sodium" salt, which contains enough potassium to keep a Geiger counter happy. Quite a lot of research has been done on brick safety, mainly in areas where radioactive deposits may have affected clays used in brick making, and they have not been found to be hazardous. Depleted uranium is quite another matter. It doesn't accumulate the short lived nucleides as fast as "raw" uranium does, but it is still quite radioactive enough on its own - over 12000 Bq/g.
I thought I should reply to this in case anybody were to read it and think it's OK to open a DU munition. Don't. The stuff is extremely dangerous despite the lies told by NATO following the Balkan wars and Iraq. Uranium even catches fire in air and produces clouds of smoke which, if inhaled, will give you lung cancer if the toxicity doesn't get you first. DU munitions arose as a way of getting rid of surplus 238U - after all it was only going to be used on Muslims, many of them brown.