A nuclear stress test utilizes a gamma-emitting radioisotope such as thallium-201 to follow the flow of blood through the heart - first at rest, and then under stress. The first-order rate constant for the decay of thallium-201 is 9.5 x 10-3 hr-1. Calculate how long it takes for the amount of thallium-201 to fall to 5.0% of its original value. Round the answer to two significant digits. O 320 hr O 340 hr O 360 hr O 380 hr O None of the above

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