Correct Answer:- Option-B
Question58:-Which of the following isotope is not used for permanent implant in brachytherapy ?
A:-Gold 198
B:-lodine 125
C:-Palladium 103
D:-Cesium 137
Correct Answer:- Option-D
Question59:-Cobalt 60 radioactive isotope has a half life of
A:-74 days
B:-1620 years
C:-30 years
D:-5.6 years
Correct Answer:- Option-D
Question60:-Which of the following is a beam modifying device used in Radiotherapy ?
A:-Phantom
B:-Wedges
C:-Breast Board
D:-Thermoplastic masks
Correct Answer:- Option-B

Question61:-Which of the following radiation detectors cannot be used in automatic exposure control (Photo timers) in an
x-ray generator system ?

A:-Thermoluminesent detector
-Photo multiplier detector

C:-lonization detector
D:-Solid state detector
Correct Answer:- Option-A

Question62:-CT number for air is
A:-0

Correct Answer:- Option-B
Question63:-The degree of blackening of Radiographic of film is described by
A:-Optical density
Im sensitivity
-Film speed
D:-Gamma
Correct Answer:- Option-A
Question64:-True statement regarding plain abdominal radiography is
A:-A short exposure time is unnecessary
B:-The lower border of cassette should be positioned at the level of pubis symphysis
C:-Injection of air via nasogastric tube helps in diagnosis of perforation
D:-All of the above
Correct Answer:- Option-C
Question65:-The Gadolinium-diethyltriamine penta acetic acid (Gd-DTPA) is a
A:-Contrast medium used in Magnetic Resonance Imaging
-Contrast media used for CT imaging
C:-Contrast media used in Fluoroscopy
D:-Emulsion used in x-ray films
Correct Answer:- Option-A
Question66:-Which of the following is not a Magnetic Resonance Imaging Parameter ?
A:-Spin Density
B:-Electron Density
C:-T2 Relaxation Time
0:11 Relaxation Time
Correct Answer:- Option-B
Question67:-The inherent filtration in an x-ray tube ranges from
A:-0.5 to 1 mm Al.
:+.001 to .01 mm lead