Yttrium-90 is used in radioisotope therapy to treat various neuroendocrine tumors.Yttrium-90 has a half-life of 64 h. A sample of 90Y has an activity of 2.5×107 Bq when first measured. (a) What is the decay constant for 90Y ? (in s−1 )? (b) How many atoms of 90Ymust be in the sample initially? (c) What fraction of the atoms of 90Y will be left in the sample after just 1 hour?
Yttrium-90 is used in radioisotope therapy to treat various neuroendocrine tumors.Yttrium-90 has a half-life of 64 h. A sample of 90Y has an activity of 2.5×107 Bq when first measured. (a) What is the decay constant for 90Y ? (in s−1 )? (b) How many atoms of 90Ymust be in the sample initially? (c) What fraction of the atoms of 90Y will be left in the sample after just 1 hour?
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4. Yttrium-90 is used in radioisotope therapy to treat various neuroendocrine
tumors.Yttrium-90 has a half-life of 64 h. A sample of 90Y has an activity of 2.5×107 Bq when
first measured. (a) What is the decay constant for 90Y ? (in s−1
)? (b) How many atoms of 90Ymust
be in the sample initially? (c) What fraction of the atoms of 90Y will be left in the sample after
just 1 hour?
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