'Po-210 represents a radiation hazard only if taken into the body – by inhalation, ingestion, or getting into a wound. This “internal contamination” can cause irradiation of internal organs, which can result in serious medical symptoms or death. The toxicity of Po-210 is much higher than that of cyanides, for example. Nevertheless it does not represent a risk to human health as long as it remains outside the body. Most traces of it can be eliminated through careful hand-washing and showering, or washing machine and dishwasher cycles.' - World Health Organisation. Polonium-2010: basic facts and questions.
