Final answer:
In a bone scan, free technetium will result in uptake in the thyroid and gastric mucosa. The radioactive tracer should normally concentrate in bone, but free technetium is also absorbed by these other tissues.
Step-by-step explanation:
Free technetium in a bone scan kit will result in activity in the thyroid and gastric mucosa. When using a radioactive tracer for bone scans, the tracer aims to selectively concentrate in areas of high bone turnover, which are often indicative of bone cancer or other bone pathologies. However, if the tracer is not prepared properly and free technetium is present, it can be taken up by other tissues such as the thyroid due to its ability to absorb iodine and technetium analogs, and the gastric mucosa due to similar mechanisms. Thus, the answer to the question is e - both b (thyroid) and c (gastric mucosa).