lesson 3

Question 1

• not exceed (21mGYA/min)(2.1R/min)
• for each mA operation at 80kVp

Answer 1

tabletop

Question 2

• not exceed (100mGya/min)(10R/min)
• max table top dose

Answer 2

no optional high level control

Question 3

• (200mGya/min)(20Rmin)
• boost fluoroscopy

Answer 3

with optional high level control

Question 4

no limit on x-ray intensity when image is recorded

Answer 4

Cineradiography or videography

Question 5

• energy deposited locally
• the quantity that best reflects the potential for injury to that tissue

Answer 5

tissue radiation dose

Question 6

• this radiation is the most intense, hazardous and difficult to shield
• useful beam

Answer 6

primary beam (other is secondary radiation)

Question 7

when beam intercepts any objects causing some x-ray to scatter

Answer 7

scatter radiation

Question 8

radiation emitted from the x-ray tube housing in all direction other than that of the useful beam

Answer 8

leakage radiation

Question 9

assist for the design of proper radiation shielding

Answer 9

medical physicist

Question 10

any wall to which the useful beam can be directed

Answer 10

primary barrier

Question 11

examples of primary barrier

Answer 11

• lead bonded
• sheetrock
• wood paneling

Question 12

designed to shield areas from secondary radiation

• operating console
• barrier
• ceiling
• walls

Answer 12

secondary protective barrier

Question 13

examples of less thick than primary radiation barrier

Answer 13

• gypsum board
• glass
• lead acrylic

Question 14

factors that affect barrier thickness

Answer 14

• distance
• occupancy
• control, workload
• use factor
• kVp

Question 15

distance between the source of radiation and the barrier

Answer 15

distance

Question 16

must be positioned in the middle of the room

Answer 16

x-ray imaging system

Question 17

the use of the area that is being protected is of principal importance
(40 hours per week = more shielding, office, and lab)

Answer 17

occupancy

Question 18

length of time that the area being protected is used

Answer 18

time occupancy factor (T)

Question 19

an area occupied primarily by radiology personnel and patient

Answer 19

controlled area or CONTROL

Question 20

area that is occupied by anyone

Answer 20

uncontrolled area

Question 21

• express in 9mAmin/week) milliAmpere-minutes per week
  level of radiation activity in the room

Answer 21

workload (W)

Question 22

percentage of time during which the x-ray beam is on and directed toward a particular protective barrier

Answer 22

use factor (U)

Question 23

• used as a measurement of penetrability
• final consideration in the design of the protective barrier

Answer 23

kVp

Question 24

kVp of the ff:
- general radiography
- mammography
- modern x-ray
- most examination

Answer 24

• 100kVp
• 30kVp
• 150kVp
• 75kVp