Assertion: plutonium | /r/CapableOf | serve as a source of radon gas
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Source sentences:
text: For direct inhalation, Ra is less hazardous than Pu, but it serves as a source of radon gas, which comes up out of the ground and mixes with the air we breathe, and therefore is a serious inhalation hazard, so as material on the ground, Ra is a 40-fold greater inhalation hazard than Pu.