In the late 20th century and early 21st century, some "health mines" were established in Basin, Montana, which attracted people seeking relief from health problems such as arthritis through limited exposure to radioactive mine water and radon.[80] The practice is controversial because of the well-documented ill effects of high-dose radiation on the body.[81] Radon has been alleged to induce beneficial long-term effects,[3][dubious ] although proper clinical trials have not been performed.