The half-value layer of lead is 0.27 mm for Tc99m. A dose generates 5300 mR/hr before being shielded. What will be the exposure rate after the dose is placed in a shield made with 0.90 mm of lead?

A Co57 check source with an activity of 0.05 uCi is permanently attached to a Geiger counter. If Γ=0.56 R·cm2 /mCi ·hr at 1 cm, what is the exposure rate to a technologist who sits 30 cm (about 1 ft) from the unshielded source?

If a source produces an exposure rate of 350 mrem/hr at 3 inches from the surface, what is the exposure rate at 36 inches?

Convert 0.75 mGy to mrad.

When a radioactive source produces 160 mrem/hr at 1 meter. What is the exposure rate at 3 meters?

Convert 4.1 MBq to µCi

An area of undetected contamination has an exposure rate of 3.2 mrem/hr. What will be the total radiation dose to a technologist who works over the contamination for 90 minutes?

Mrs. Hall, the school nurse, noticed a second grader scratching and pulling at the back of her pants. She complained that her bottom itched, mostly in the early morning hours. Since another child in the student’s class had recently been diagnosed with Enterobius vermicularis, or pinworm infection, Mrs. Hall contacted the girl’s mother. She immediately agreed to follow up with her pediatrician. Helminths belong to which domain of life?

Bonus If you study fungi, what sort of microbiologist would you be considered?

Which person started the Greenbelt movement, received a Noble prize and was “first” in many accomplishments in their home country of Kenya?