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Compute the photon flux (per cm2·sec to 4 significant figures) to a person standing a half meter from an unshielded [activity]-MBq Am-241 source.

For a fast metal assembly, calculate the infinite multiplication factor (to 4 significant figures) for a fuel comprised of [U238]% U-238 (by atomic abundance) and the remainder being Pu-239.

The average annual dose from ubiquitous background radiation varies from state to state. In which of the following states does the background radiation dose exceed the average annual background dose to residents of the U.S.? (Select all that apply.)

Multiple Answer Questions: Select the best answer(s) for following question.

The neutron flux in a reactor is analogous to the [blank] of a vehicle.

U-234 achieves the largest fraction of the total activity within [blank] uranium

A radiographer takes an initial radiograph using the technical factors of 50 mA at 0.46 seconds. There is involuntary motion on the radiograph, but the radiographer wants to maintain IR exposure. If the exposure time is reduced to 0.115 seconds, what is the new mA? Show your work and include the correct answer units.  

In general, thick body parts and large field sizes cause more scatter than kVp. 

A low quality x-ray beam travels far in body tissues.

Which of the following factors primarily controls subject contrast?