minimizing exposure to personnel

Question 1

what is the radiation dose threshold to be declared a radiation worker

Answer 1

1/20th of the whole body dose limit (20 mSv)

Question 2

when a protective apron is worn, the personal dosimeter must be worn (over/under) the apron

Answer 2

under

Question 3

why do radiation workers have a higher eqD than the public

Answer 3

the workforce is small
can be higher without reaching the GSD

Question 4

what is GSD

Answer 4

genetically significant dose

Question 5

what 2 types of damage can occur from radiation

Answer 5

somatic damage
genetic (hereditary) damage

Question 6

what are the 3 biggest principles of radiation protection

Answer 6

distance, time, shielding

Question 7

what is the most effective means of protection from ionizing radiation

Answer 7

distance

Question 8

mobile x-ray unit cords must be ___ from the tube

Answer 8

3 metres, or 9 feet

Question 9

where (during mobile) should the radiographer attempt to stand

Answer 9

at a right angle to the beam-scattering object line

Question 10

at a 90 degree angle and 1m distance, the scattered x-ray is at ___ of the original intensity of the primary beam

Answer 10

1/1000

Question 11

how can time be used to reduce exposure to personnel

Answer 11

rotational scheduling of personnel

Question 12

what procedures can increase risk of radiographer exposure (5)

Answer 12

general fluoro
interventions with high-level-control fluoro (HLCF)
mobile exams
general rad procedures
c-arm fluoro

Question 13

when is shielding used to reduce dose

Answer 13

when not possible to reduce time and distance

Question 14

what 2 technical exposure factors can be used to protect personnel

Answer 14

inc avg beam energy (more forward scatter, less side)
lower mAs (fewer photons)

Question 15

what regulation is in place in relation to the control booth entrance

Answer 15

photons must scatter TWICE before the entrance

Question 16

what property of the control booth is regulated for safety

Answer 16

the cord must be short enough that the operator must be in the booth

Question 17

controlled areas may be occupied ONLY by whom

Answer 17

the occupationally exposed

Question 18

what is the radiation dose limit for uncontrolled areas

Answer 18

1mSv/yr

Question 19

direct radiatio exposure of personnel by the primary beam…

Answer 19

must NEVER be allowed

Question 20

should operators hold patients?

Answer 20

no!

Question 21

are pregnant women permitted to assist in holding a patient

Answer 21

NO NEVER

Question 22

where should you aim to point the beam whenever possible

Answer 22

unoccupied areas r primary barriers

Question 23

what is the rule about the primary beam and secondary barriers

Answer 23

never expose a secondary barriers with the primary beam

Question 24

the control booth is a (primary/secondary/tertiary) barrier

Answer 24

secondary

Question 25

what must be marked on protective materials

Answer 25

must be permanently and clearly marked

Question 26

how often must protective equipment be tested

Answer 26

on a yearly basis

Question 27

what must you not do with aprons during storage

Answer 27

fold them

Question 28

scatter is more intense on which side of the patient

Answer 28

the side closer to the source

Question 29

which position is better for personnel

Answer 29

2, under the table

Question 30

on which side of the table should personnel stand when doing lateral exposures

Answer 30

on the II side

Question 31

what is the required lead equivalency of an apron for 100 kV or less

Answer 31

0.25mm

Question 32

what is the required lead equivalency of an apron for 100 kV or less, 150 k|V or more

Answer 32

0.35mm

Question 33

what is the required lead equivalency of an apron for 150 kV or more

Answer 33

0.5mm

Question 34

what Pb equivalency must protective gloves have

Answer 34

0.25mm Pb eq throughout entire glove

Question 35

protective gonadal shielding for pts: MUST have ____PB eq SHOULD have ___ Pb eq

Answer 35

must have 0.25 mm should have 0.5 mm

Question 36

full wrap protective gowns must have; ___ Pb eq in front panels ___ Pb eq in back panels

Answer 36

0.50 mm in front 0.25 mm in back

Question 37

for interventional procedures, thyroid shields of ___ Pb eq are recommended

Answer 37

0.50 mm Pb eq

Question 38

what is recommended if the procedure could approach the annual exposure limit of ___ to the eye?

Answer 38

150 mSv lead glasses

Question 39

the exposure rate from scatter at the (ent/exit) of pt exceeds that if at the (ent/exit)

Answer 39

at entrance exceeds that of at the exit

Question 40

which lead glasses style is an appropriate choice, with monitors at 45deg from the field

Answer 40

classic

Question 41

which lead glasses style is an appropriate choice, with monitors at 90deg from the field

Answer 41

sport wrap

Question 42

what is the minimum lead eq for a fluoro spot film protective curtain/sliding panel

Answer 42

0.25mm lead eq