Question

Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient's body to treat cancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damage to healthy tissue. Iridium-192 is often used in the head or breast. Use the radioactive decay curve of iridium-192 to answer the three questions. us Dobi lio in 100 Ir the initial sample is 6.75 . what mass of the original iridium-192 remains after 55 days MacBook Air BARABA

Answer 1

mass of sample remains after 55 days = 4.05 g

Explanation

initial mass of sample = 6.75 g

From the given graph, after 55 days 60% of sample remains

Mass of sample remains = (initial mass of sample) * (mass fraction of sample remains)

Mass of sample remains = (6.75 g) * (60 / 100)

Mass of sample remains = (6.75 g) * (0.60)

Mass of sample remains = 4.05 g