HMM: Mussels downstream of wastewater treatment plant contain radium, study reports.
Hmm. Radium 228, which is what most people think of when they think of radium, has a half-life of 6.7 years. I doubt that is coming out of the Marcellus Shale. Radium 226 has a half-life of 1600 years, and is less radioactive as a consequence.