10.

11.

13.

14.

15,

16.

Regarding 1% generation fluoroscopy, which of the following is not true ?
(ಹಿ) consists of X-ray tube, X-ray table and flueroscopic screen

(ए) fluorescopic material was barium flurocyanide

(C) green screen was synonym for fluoroscopy

(D) examination was carried oul in a dark room wearing red goggles

Regarding discovery of X-rays, which of the following is not true ?

(A) Wilhelm Conrad Roentgen was a German physicist

(8) discovered X-rays on November 81, 1895

(9) noticed fluorescence of small piece of paper coated with barium platinocyanide- which
lead to the discovery of X-rays

(D) noticed Nobel prize for physics in 1902

Regarding S! units, which of the following is not true ?
(^) 51 umit of radionuclide activity is Becquerel

(B) 8] पा of absorbed dose is Rad

(€) Sl unit of magnetic flux density is tesla

(D) Sl unit of charge is coulomb

Regarding X-ray tube filament, which of the following is not true ?

(ಗಿ) X-ray tube current refers to number of electrons flowing per second from filament to target

(B) filament is tungsten wire about 0.2 mm in diameter

(9) யாண must be heated to at least 2000 degrees C for thermionic emission

(10) tungsten is selected as filament because of high melting point and has little tendency to
vapourise

Regarding Heel effect, which of the following is not true ?

(^) intensity of X-ray beam that leaves X-ray tube is not uniform throughout all Portion of
beam is called heel effect

(0) ണ്ടി of film exposed on the anode side of tube is significantly less than cathode side

(ಲಿ) 158! effect is less noticeable when small FFD are used

(12) in equal target film distances, heel effect will be less for smaller films

Regarding X-ray image intensifier, which of the following is not true ?

(A) input Phosphor in old image intensifier was Zinc-cadmium sulfide

(B) input Phosphor in newer image intensifier is cesium iodide

)© cesium iedide crystals are oriented in horizontal direction

(D) phosphor thickness of cesium iodide is 3 times less than Zn-Cd-Sulfide

Regarding X-ray image intensifier, which of the following is not true ?

(A) photocathode is a photoemissive metal (commonly a combination of antimony and cesium
compounds)

(0) photocathode is directly applied of Cs I input Phosphor

(C) electrostatic focusing lens is made up of aluminium

(5) photoelectrons are produced from the photocathode proportional to the intensity of light
from input Phosphor

Regarding X-ray image intensifier, which of the following is not true ?

(ക) Accelerating anode has positively charged

(8) output Phosphor is silver activated zinc-cadmium sulfide

(0) thin layer of aluminium is plated onto the fluorescent screen to prevent stray radiation
(D) இணை tube of the image intensifier is about 2 - 4 mm thick

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