HESI Review: Safety

Which of the following is primarily responsible for occupational exposure?

• Primary x-ray beam 

• Compton interactions 

• Classical interactions

• Photodisintegration 

Which of the following are beam-limiting devices? (select the three that apply)

• Aperture collimators 

• Cones 

• Grids 

• Cylinders 

• Compensating filters 

The intensity of scatter 1 m from the patient is about what percentage of the useful beam?

• 10%   

• 1%   

• 0.1%   

• 0.01% 

What acronym serves as a reminder to the radiologic technologist to keep exposure to themselves and their patients to a judicious minimum?

• BERT 

• LET 

• RBE 

• ALARA 

When a lead apron is worn during a procedure, the personnel dosimeter should be placed

• under the lead apron at collar level 

• outside of the exam room 

• outside of the apron at collar level 

• at waist level 

The rotational scheduling of personnel uses which of the cardinal principles of radiation safety?  

• Time 

• Distance 

• Shielding 

• Inverse square law 

During mobile radiography, the source-to skin (SSD) distance must NOT be less than

• 12 inches 

• 15 inches 

• 20 inches 

• 24 inches 

Which type of shielding should be used during an examination that requires a sterile field?

• Shaped contact shield 

• Flat contact shield 

• Shadow shield 

• Fixed shield 

The active ingredient in optically stimulated luminescence (OSL) dosimeters is 

• tin 

• aluminum oxide 

• copper 

• lithium fluoride 

For examinations using stationary fluoroscopes, patient entrance exposure can be limited by maintaining a minimal source-to-skin distance (SSD) of

• 30 cm (12 inches) 

• 15 cm (6 inches) 

• 38 cm (15 inches) 

• 25 cm (10 inches)