Question: Use the exponential decay equation A = A 0 (0.5) t / k , where A is the amount of a radioactive material present after

Use the exponential decay equationA=A₀(0.5)^t/k,

whereAis the amount of a radioactive material present after timet,kis the half-life of the radioactive substance, andA₀is the original amount of the radioactive substance. Round to the nearest tenth.

An isotope of technetium is used to prepare images of internal body organs. The isotope has a half-life of approximately6 h.A patient is injected with30 mgof the isotope.

(a) What is the technetium level in the patient after3h?

A=____________mg

(b) How long (in hours) will it take for the technetium level to reach21mg?

t=_____________h

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