Question 620
For bone, x-ray attenuation is predominantly due to...
Question 621
Which of the following is true in regards to Compton scattering?
Question 625
The effect on the x-ray spectrum of reducing the anode angle is similar to that of...
Question 626
The Compton absorption probability per electron is approximately...
Question 635
The inverse square law relationship between radiation intensity and distance from a point source of radiation (e.g. x-ray tube focal spot) is due to...
Question 636
The type of x-ray interaction with matter in which all of the energy of the incident photon is expended in dislodging a bound electron is called...
Question 637
The term photon was coined to apply to...
Question 638
A radiograph is taken of a kidney using a source to image-receptor distance (SID) of 100 cm with the kidney 50 cm from the plane of the image receptor. The kidney shadow is 24 cm long. The length of the kidney is approximately...
Question 639
An x-ray beam with a high half value layer is...
Question 640
When a filter is used to harden a diagnostic energy x-ray beam, it does so mainly by...
Question 641
Which of the following statements is FALSE?
Question 642
In comparison with a single phase high voltage (HV) generator of the same kVp, the effective energy of the x-rays from a medium frequency generator is...
Question 698
Which one of the following has minimal effect on the patient's skin dose?
Question 699
The effective dose a patient receives from a single PA chest x-ray is approximately...
Question 700
One gray is defined as...
Question 701
The inverse square law applies well in the primary beam. In regard to radiation scattered from the patient the inverse square law...
Question 702
An individual receives a radiation effective dose of 200 Sv of penetrating radiation during the detonation of a nearby nuclear device. The most likely effects are...
Question 703
The sievert (Sv) is a unit of...
Question 752
A fluoroscopic system has automatic brightness control in which the kV is adjusted manually and the mA varies as a function of patient thickness. For a given patient thickness, as the kV is decreased...
Question 753
An occupationally exposed person undergoing fluoroscopy of their abdomen has inadvertently left their personnel dosimeter on in such a way that it is at the point of entry of the primary beam. It would take how many minutes of screening time for the dosimeter to record his annual maximum permissible whole body dose?