Radiation protection

Question 1

how does scatter affect contrast

Answer 1

decrease

Question 2

• increases photoelectric affect

Answer 2

kvp

Question 3

source of free electrons

Answer 3

heated filament

Question 4

thermionic emission

Answer 4

electrons boiling off of heated filament

Question 5

acceleration of electrons

Answer 5

positive anode, negative cathode kvp= push

Question 6

deceleration of electrons

Answer 6

hitting anode (kinetic energy to xray)

Question 7

Bremmstrahlung

Answer 7

electron passes close to the nucleus

nucleus positive makes electrons brake

Question 8

Most common target interaction

Answer 8

bremmstrahlung

Question 9

• makes beam hereto

Answer 9

bremmstrahlung

Question 10

Characteristic

Answer 10

electron gets hit, kicked oput

another electron falls in inner shell

Question 11

what affects the quantity of Xrays

Answer 11

ma
time
kvp
filtration

Question 12

what affects quality

Answer 12

kvp

flitration

Question 13

compton effect aka

Answer 13

modified/incoherent

Question 14

compton

Answer 14

xray hits an outer electron, some energy absorbed

slightly lower xray goes in diff direction

Question 15

compton usually happens with

Answer 15

high kvp

Question 16

most common scatter

Answer 16

compton

Question 17

photoelectric

Answer 17

xray hits and knocks out electron

electrons fall down to fill hole

Question 18

most of patient dose happens b/c of

Answer 18

photoelectric

Question 19

• produces contrast

Answer 19

photoelectric

Question 20

photoelectric formula

Answer 20

Incoming energy= binding energy + kinetic energy of ejected

Question 21

coherent scatter aka

Answer 21

unmodified / elastic / rayleigh / classical

Question 22

coherent

Answer 22

xray hit electron, both vobrate

the electron goes in diff direction

Question 23

coherent is -% of scatter

Answer 23

3

Question 24

coherent doesnt happen with kvp lower than

Answer 24

70

Question 25

differential absorption

Answer 25

ratio of absorption of one tissue to another

Question 26

partial absorption

Answer 26

how much gets sucked up due to tissue density

Question 27

- is basis for contrast

Answer 27

partial absorption

Question 28

thinner part = - attenuation = darker/lighter

Answer 28

less darker

Question 29

increase tech for - tissue increase

Answer 29

4-5 in

Question 30

effective dose

Answer 30

absorbed dose x rad weighting factor x tissue type | SV

Question 31

dose equivalent

Answer 31

absorbed dose x rad weighting factor harm based on rad type sv

Question 32

absorbed dose

Answer 32

energy absorbed | gray

Question 33

air kerma

Answer 33

the energy of ionization in air | gray

Question 34

exposure

Answer 34

number of ionizations in the air | columb/kg

Question 35

linear nonthershold

Answer 35

no level safe | response prop to rad

Question 36

stotastic dose response

Answer 36

linear nonthershold

Question 37

linear thershold

Answer 37

low rad= no respose until threshold hit | prop to rad

Question 38

ARS does response

Answer 38

linear thershold

Question 39

nonlinear thershold

Answer 39

low rad= no respose until threshold hit | not prop to rad

Question 40

nonlinear nonthershold

Answer 40

no level can be safe | the response happens at every dose not prop to dose

Question 41

LET

Answer 41

energy deposited per distance traveled

Question 42

low LET = - energy = - damage

Answer 42

high, low

Question 43

RBE

Answer 43

compares rad vs standard