I tried to check exactly on the internet but it seems nowadays that Official Marie Curie Y All Mothaf Ckas Need Science Vintage Retro Shirt interesting website will not let you read their content without you creating an account or subscribing in some way. To what I gathered, the radiation would be inside her body. Basically, she was constantly working with metal made of these unstable atoms, and when you touch something there will be some dust that attaches to your hands. Then you touch your face, mouth, etc and this dust gets inside your body.
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So effectively she swallowed dust made of unstable atoms, and this dust stayed in Official Marie Curie Y All Mothaf Ckas Need Science Vintage Retro Shirt her body. I think they were even assimilated into her bones and organs, I’m not so familiar with this. The result is that the harmful radiation now comes from inside the body and the organs are directly exposed (normally the skin provides some protection). There are biological mechanisms that let the body slowly renew its content and thus “purge” the radioactive dust away (e.g. in your urine) and replace it by more normal components. However, once you’re dead, these mechanisms cease and the dust stays in the body and the bones instead of being washed away.