Question

Thanks!

1. At time t = 0, a sample of radioisotope Physiconium has activity 4096 counts/second (Bq) and half-life 30 minutes. What is the expected activity after 2 hours, in becquerel? 2. High energy protons are used for some special radiation therapy situations. The protons have mean energy = 1 MeV, and 4 million particles are absorbed a region of the brain which has mass 0.1 kg. Find the absorbed dose for the brain region, in milligray. 1 eV = 1.6E-19 J. 3. High energy protons are used for some special radiation therapy situations. The protons have mean energy = 1 MeV, and 4 million particles are absorbed a region of the brain which has mass 0.1 kg. Find the absorbed dose for the brain region, in milligray. 1 eV = 1.6E-19 J.

Answer 1

1. -0.5 hows. 0.693 0.693 TY2 0.5 Given, Half life, I 2 = 30 min. Delay Constant, da 1-380/hout Acurity, Az Anett (Ao - Initial activity) 256 decay I see . - 1.386x2 - Az 4096x é 2. 1x108x 1.6x10 Energy of protons -19 x 4x10 6.4x107 Joules Abrobed dose Energy 6.44107 64*100 Gray Mar - Absorbed dose a 6.4x10 6.4x10 milligray 3. Same as az. Abrobbed dose a 6.40 milligray