Answer the following statement(s) true (T) or false (F)

Question

1. The effective focal spot size will still remain smaller than the actual focal spot size as long as a 45° anode target angle is not exceeded.
2. Penetrability refers to the x-ray beams ability to penetrate through matter.
3. The tube housing protects the patient and technologist by limiting the amount of leakage radiation to less than 100 mR/hr at 1 meter from the source.
4. A space charge is the accumulation of electrons around the anode caused by thermionic emission.
5. The negative force created by a space charge makes it difficult for additional photons (possessing a negative [] charge) to be boiled off the filament.

Answer 1

1. TRUE Line focus principle states that if the angle of the anode is less than 45°, the effective focal spot size will always be smaller than the actual focal spot size.
2. TRUE High penetrability equates to low patient dose.
3. TRUE The tube housing limits excess radiation exposure.
4. FALSE A space charge is the accumulation of electrons around the cathode filament caused by thermionic emission.
5. FALSE This phenomenon is known as a space charge effect.