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[*Note: The half-life of 63Ni is 100.1 years for future reference....] 5 micrograms. half life is 91.6 years, goes into 184 2 times, 20 X 1/2=10, 10 X 1/2=5. 5 micrograms. 184/96 = 2. 20/2=10 10/2=5 nob

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What is it called where your lifeline is attached to a solid structure that is capable of supporting your weight when you fall?

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