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Q3.

The radioisotope 204 TI is produced via neutron activation of stable thallium in a nuclear reactor. 204TI isotope is found to have a half-

life of 3.78 years.

In the product-mixture of a nuclear reactor, a sample of 204TI with activity of 1.56 x 10³ dps was isolated and kept in a sealed

container. Work out the decay constant and estimate the activity after the container has been stored for 2 years and 3 months.

Fig: 1