How many half-value layers must be added to the primary beam to reduce its intensity to less than 20 percent of its original value?
a. 1
b. 2
c. 3
d. 4
c. 3
You might also like to view...
A conscious and alert 44-year-old female complains of chest pain and mild shortness of breath. She appears to have no difficulty speaking and states that the pain suddenly started about 2 hours ago. There is a history of blood clots in the lungs in her family, and she is scared and would like to be evaluated. Which of the following should you do first?
A) Consider administering oxygen. B) Determine the adequacy of her breathing. C) Place her on the stretcher for transport. D) Perform a secondary assessment.
Which of the following statements regarding mixed occupancies is LEAST accurate?
A) Building codes require fire-resistive separations between various occupancies. B) Local building codes determine the specific occupancy separation requirements. C) Building codes require that all occupancies maintain a 1 to 3 hours separation. D) A reduction in separation may be permitted if the building is sprinklered.
Most people needing long-term care need it for more than 90 days
Indicate whether the statement is true or false.
Nails can grow at a rate of about:
A) 1 mm per day B) 0.5 mm per day C) 0.1 mm per day D) 0.01 mm per day