Radiation and Radon in Natural Stone – Setting the Record Straight
讲稿摘要/Abstract of Speech:
The issue of radiation in granite and the emission of radon from the granite kitchen countertops has been raised a number of times over the last 15 years - usually prompted by the quartz surfaces and plastic industry who are continually attempting to undermine the qualities/virtues of natural stone by misinformation crusades. For example, on May 8, 2008 radio station KHOU Channel 11 in Houston, Texas released a video that presented a one-sided account of radiation levels in granite and associated radon levels in homes that contain natural granite kitchentops. To support their account they engaged a particle physicist from Rice University to undertake radiation analyses of a number of kitchentops using a portable Na(I) gamma-ray spectrometer.
By publicly suggesting that kitchen countertops might be radioactive invariably elicits a degree of concern and panic among uninformed consumers. Consumers have neither the means to determine the radiation levels in their homes nor any avenue by which they can extract such information from the fabricators or wholesalers of stone.
A significant amount of testing since then has demonstrated that the potential hazard of radiation and radon emitted from natural stone is negligible. In context, more radiation is emitted from other building products and much more radon is produced in the natural environment from surrounding rock, soil and groundwater than is generated by stone countertops. We receive much more radiation during every flight or from a medical X-ray.