(c) A scientist has compared the vitamin content of food exposed to gamma radiation with food that has not been exposed. The table gives the data the scientist obtained when she tested 1 kg of cooked chicken. Food not exposed to gamma radiation Food exposed to gamma radiation Vitamin Mass in milligrams Mass in milligrams B6 1.22 1.35 B12 21.00 28.00 3.30 2.15 Niacin 58.00 55.50 Riboflavin 2.10 2.25 Considering only this data, which one of the following is a correct conclusion? Put a tick (V) in the box next to your answer. Vitamin content is not affected by gamma radiation. Gamma radiation completely destroys some types of vitamin. Exposure increased the content of some types of vitamin.

A 75 kg patient swallows a 33 μCi beta emitter whose half-life is 5.0 days and whose RBE is 1.6. The beta particles are emitted with an average energy of 0.35 MeV, 90% of which is absorbed by the body. You are a health care worker needing to find the patient's dose equivalent after one week. These series of steps will help you find that dose equivalent. In all questions, assume the radioactive nuclei are distributed throughout the patient's body and are not being excreted. Part A How many radioactive nuclei did the patient swallow? Express your answer using three significant figures. ▸ View Available Hint(s) No= ΜΕ ΑΣΦ Submit ?

QUESTION 38 Rank the following procedures from lowest effective radiation dose to highest. The first choice should have little to no radiation and the last choice should have the highest radiaiton exposure. MRI of the brain extremity x-ray (ex. hand) full spine x-ray (cervical, thoracic, AND lumbar series) PET/CT fusion of the abdomen and pelvis