Question

1) What is the daughter nucleus produced when Cu59 undergoes positron emission? Replace each question mark...

1) What is the daughter nucleus produced when Cu59 undergoes positron emission? Replace each question mark with the appropriate integer or symbol.

daughter nucleus:

2) The half-lives of different radioisotopes are given in the table.

Radioisotope Half-life (min)
argon-44 12
lead-196 37
potassium-44 22
indium-117 43

a) If the initial amount of indium-117 is 9.2 g, how much indium-117 is left in the body after 86 min?

mass: (in grams)

b) How long would it take, in minutes, for the amount of lead-196 to decrease from 40.0 mg to 5.00 mg?

time: (in min)

3) A 476.2 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 47 days the amount of radioactive substance had decreased to 59.53 ng. How many half‑lives of the unknown radioactive substance have occurred?

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