writes "I live in Tokyo. Currently, levels of radioactive Iodine-131 in the water supply exceed the safe limit recommended for infants to consume. In some areas, it's approaching unsafe levels for adults as well. I can drink bottled water, but I can't avoid bathing or showering in this contaminated water. Despite it being at a "safe" concentration, whenever possible, I'd like to avoid having Iodine-131 molecules enter my body. I don't know how easily it would enter my body through my skin pores, but I'm curious...When it comes to washing oneself, which is safer, taking a bath or taking a shower?"