That is on account of stone normally contains some uranium, which is radioactive and which rots into radon that can likewise be discharged (radon is the second driving reason for lung disease). It's for the most part thought, be that as it may, that the sums contained in many ledges are little and insufficient to represent a noteworthy wellbeing risk. Most specialists concur that this measure of radiation introduction is unimportant in examination with the "ordinary" foundation radiation we are altogether presented to all the time from space and starting from the earliest stage.
Be that as it may, with the expanding prevalence of stone ledges, and the importation of a wide assortment of examples from a wide assortment of areas, it is conceivable that a few specimens actually contain more radioactive material than others. Furthermore, as per the New York Times article, many individuals are having free tests done and some are discovering levels that are higher than what might be normal. There is no normal testing done on stone before it is introduced in your home. Obviously, notwithstanding, The Marble Institute of America says this is superfluous and that stone ledges are flawlessly protected.
On the off chance that you have or are thinking about introducing stone ledges, you ought to peruse the New York Times article. Its absolutely impossible you can tell if your stone ledges are sheltered without testing them for radiation and radon. To locate a guaranteed professional to perform such tests, you can visit the site of the American Association of Radon Scientists and Technologists. As per the New York Times, testing costs amongst $100 and $300.