Interesting video! Brooklyn isn't the only borough with beachfront radioactivity, either! Great Kills Park in Staten Island was discovered to have elevated levels of radiation due to contamination from Radium 226 back in 2005. Most of the park is still cordoned off today. From what I could gather, is that the radium, along with other chemical waste, was comingled with waste fill material and was (hopefully) unintentionally disposed of there.