"..radium levels at Bayou Corne's sinkhole are not within safe limits, but instead, roughly 15 times higher than the state's acceptable level, according to one of the nation's leading environmental attorney's Stuart Smith."
http://www.examiner.com/article/sinkhole-radiation-15-times-over-limit-residents-urged-to-record-health-signs?CID=examiner_alerts_article