I'm in Silver Spring and still get poison ivy.
The biggest dose of radiation I got was from the 3 mile island initial radiation cloud release. It felt like my spine wanted to throw up.
The biggest dose my sister got was in an Army experiment of drinking 2 oz. of radioactive iodine. At the time of her death she had no digestive organs from the esophagus to the rectum. She survived on ATP alone. The Army learned people should not drink radioactive iodine.

PS If you get solar storm warnings its best to stay inside since Xrays can exceed tolerable levels outside.