RADIATION PHYSICS QUESTIONS AND ANSWERS

1. Full wave rectifier consists of

  

Ans: 4 diode valve in dridge form 

2.In step up transformer, the voltage in secondary coils is more than primary ,hence the 

Ans: current in the secondary is less

3. The power loss in the transformer is due to :

Ans : hysteresis ( or cable loss ,eddy current)

4.Rectification means  :

Ans : change  A C to D C 

5The direction and the magnitude is changed repeatedly in : 

Ans : Alternating current 

6. In transformer , the laminated cores are used to reduce the power losses by:

Ans : Eddy current 

7. Edison effect termed to the electron cloud surrounding the filament produced by : 

Ans : Thermionic emission 

8. Heat is dissipated in most of the X-ray tubes by :

Ans:  conduction convection and radiation 

9.The glass evelope of diagnostic  X-ray tube is made up of :

Ans : borosilicate 

10.The leakage radiation is that radiation which comes out :

Ans : Through glass window 

11.Penetration of the tube is directly related to 

Ans: KVP

12. The quantity of X-ray received at given point is dependant on : 

Ans : KVP

13. The amount of the kinetic energy utilized in the production of X- rays are :

Ans : Less than 1%

14. in coherent scattering , the single electron is involed in interactin in :

Ans : Thompson scattering 

15.   The S.I. unit for measurement of quantity of radiation is :

Ans: Gray,sievert ,Bequerrel

16.Photoelectric interaction results in excellent quality image due to :

Ans : Enhances natural tissue contrast 

17. In photoelectric emission , patient dose is :

Ans : High 

18.Pair production occur ,if energy is of :

Ans: 1.02Mev

19.Mass density of bone is  :

Ans : 1850 kg/m

20.Mass density of the lung is :

Ans: 320 kg/m