NARS NATIONAL QUIZ COMPETITION

Which of the following is a measure of ionisation in air

• Gray

• Roentgen

• Sievert

• Becquerel

Which isotope is commonly used in nuclear medicine for gamma camera imaging

• Iodine 131

• Cobalt 60

• Cesium 137

• Technetium 99m

Which solid state device is found in x-ray detectors

• Capacitors

• Thermistors

• Photodiode

• Diodes

At electrostatic equilibrium, the electric field inside a conductor is

• Zero

• One

• Infinite

• Dependent on the external magnetic field

The Hvl and effective energy of an x-ray beam

• Increase as the applied kv is increased

• Increase with increase in Hvl

• Increase as Ma increases

• Decrease with increasing intensity

The y-axis of x-ray emission spectrum represents

• Ma

• Mas

• Kev

• LET

Which is responsible for the production of a latent image

• Scatter radiation

• Cathode rays

• Residual photons

• None of the above

Which of these is not among the 4 R's of radiobiology

• Repopulation

• Redistribution

• Reoxygenation

• Reduction

HVL describes the ...... needed to decrease the x-ray intensity by half

• Image Receptor

• Thickness of absorbing material

• Exposure factors

• All of the above

Basic projection for carpal tunnel

• Dorsipalmer

• Ap Axial

• PA

• Lateral