That is not correct. Many chemical and mechanical processes produce radiation well into the x-ray range - even something as mundane as Scotch tape.
http://articles.latimes.com/2008/oct/25/science/sci-tape25 Forget a cloud chamber. You need a dedicated meter with data logging. Although x-rays are commonly found at low intensity in mundane situations, it is the intensity level which is important, and you need comparative counts above background over time - for decent statistical analysis. From: Joseph Hao As far as I know, there is no known chemical process that releases radiation,
