physics : xray tube

Question 1

what produces xrays

Answer 1

Orbital electrons

Question 2

what produces gamma rays

Answer 2

Nucleus

Question 3

function of wedge

Answer 3

displaces dose distribution

Question 4

Visual wedge

Answer 4

motion of a collimater

Question 5

Field size is defined at

Answer 5

isocentre ,

Question 6

Geometric field width

Answer 6

distance between the 50% isodose curves

Question 7

w/o Flattening filter

Answer 7

dose would be much higher in the central axis beam than not in the beam

Question 8

Output factor

Answer 8

is how the dose rate increases when we increase feild size

Question 9

bremsstrahlung

Answer 9

xrays produced from the stopping or decelleration of a charged particle when it hits off another charged particle

Question 10

Electron volt

Answer 10

am of energy required when one elctron is pushed through A POTENTIAL DIFFERENCE one volt

Question 11

voltage=

current=

Answer 11

kV

mA

Question 12

how xray tube works

Answer 12

electrons produced from filament are low energy but tube voltage accelerate electrons (from cathode to anode)… electrons hit anode and make bremsstrahlung

Question 13

TYPES OF TUBE
Stationary Anode X-ray Tube
Rotating Anode X-ray Tube

Answer 13

• low heat loading and low exposures range

- higher heat loading and larger exposures range

Question 14

what is the tube current
how produced
how much

Answer 14

• flow of electrons from cathode to anode
• heating filament
• few mA

Question 15

tube voltage causes

produces

Answer 15

current to flow

100kv

Question 16

Filament current
what
electrons
how much

Answer 16

current in cathode
no. of electrons emitted depends on filament temp which depends on filament current
2-4 amps

Question 17

what is filament voltage

Answer 17

voltage across ends of filament driving current around filament