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Mae hanner oes hir yn cael ei fesur gyda'r egwyddor o actifedd. Os yw 0.61 mg o ...

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Mae hanner oes hir yn cael ei fesur gyda'r egwyddor o actifedd. Os yw 0.61 mg o 239Pu gyda actifedd o 1.4 x 106 Bq, cyfrifwch hanner oes 239Pu.

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