Radiation Seed Therapy Is a Common Method for Treating Some $\mu$

question 21

Multiple Choice

Radiation seed therapy is a common method for treating some prostate cancers and brain tumors. Cesium-131 is a new isotope being proposed for this treatment. Cesium-131 decays with a half-life of 9.7 days by emitting X-rays with a photon energy of 29,000 eV. What mass of cesium-131 would have to be embedded in a 15 g tumor to produce a radiation dose of 115 Gy in 3 weeks' time (21 days) ? Note: 1 Gy = 1 J/kg, and 1 eV = 1.60 *10^-19 J.

• A) 0.37 \(\mu\)g
• B) 0.31 \(\mu\)g
• C) 0.10 \(\mu\)g
• D) 0.23\(\mu\)g
• E) 0.16 \(\mu\)g

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