because marie curie was walking around with radioactive materials; the radiation was able to “seep” inside of everything. As her stuff gets old and more fragile it becomes likely that handling her posessions will release microscopic bits of ratioactive material. marie curie’s diary is not super radioactive any more, but does pose a health hazard if precautions are not taken
walking around with bits of radium and polonium in your pocket over a long time is different than the instant blast of a bomb
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