The Durridge Natural Rock Sample makes it possible to monitor the RAD7’s performance up to once each month. With it you can make a precise check of the RAD7 sensitivity to both radon and thoron. We have released a technical document describing this process. It can be found in PDF format at the Natural Rock Sample page. In addition, our CAPTURE software has been updated to version 5.2.6. This release fixes minor issues. Learn more about CAPTURE here.