Exam 4 Ch. 40- Occupational Radiation Dose Management

Question 1

high in occupational exposure-

Answer 1

interventional radiology

Question 2

cardinal principles in occupational exposure-

Answer 2

time, distance, & shielding

Question 3

time-

Answer 3

-biggest issue
-highest occupational & interventional exposure (fluoro/interventional)

Question 4

distance-

Answer 4

tech should remain as far as practical from patient

Question 5

shielding-

Answer 5

-maximize when possible
-protective curtain & bucky slot cover (shields rad & dr)

Question 6

scatter during fluoro more intense when-

Answer 6

the tube is over the patient

Question 7

average whole body exposure/dose-

Answer 7

0.7 mSv/yr

Question 8

receiving less than minimum-

Answer 8

53%

Question 9

receiving less than 1 mSv/yr-

Answer 9

88%

Question 10

receiving more than 50 mSv/yr-

Answer 10

0.05%

Question 11

occupational exposure high in-

Answer 11

-fluoro
-portables
-specials (extremities)

Question 12

with II under the table-

Answer 12

-image quality is improvised
-occupational exposure is increased

Question 13

occupational exposure low in-

Answer 13

mammo & CT

Question 14

occupational exposure lower in mammo because-

Answer 14

lower kVp so scatter is reduced

Question 15

occupational exposure low in CT because-

Answer 15

beam is so tightly collimated & technologist doesn’t have to be in room

Question 16

occupational exposure in surgery-

Answer 16

Drs., nurses, & other technologists

Question 17

goal of NCRP (3)-

Answer 17

-formulate & disseminate information
-guidance
-DL recommended that reflects most current scientific thinking

Question 18

early dose limits were based on-

Answer 18

threshold doses

Question 19

current dose limits prescribed for-

Answer 19

-specific organs
-whole body dose

Question 20

although exposure should be kept ALARA, there’s-

Answer 20

no patient dose limit

Question 21

current dose limits are based on-

Answer 21

linear, non-linear threshold dose response relationship

Question 22

consider the level of exposure acceptable as-

Answer 22

occupational hazard

Question 23

effective dose concepts taken into consideration-

Answer 23

-verifying effects of radiation exposure
-varying degree of radiosensitivity

Question 24

wearing a lead apron reduces radiation dose to-

Answer 24

some tissues, nearly 0 (dose limits rarely exceeded

Question 25

w: a collar monitor, a person who works in fluoro would need to-

Answer 25

convert effective dose readings due to wearing lead apron

Question 26

whole body dose limit-

Answer 26

-50 mSv/yr -5,000 mrem/yr -5rem/yr

Question 27

skin & extremities dose limit-

Answer 27

-500 mSv/yr -50 rem/yr

Question 28

dose limits in skin & extremities are-

Answer 28

-not normally a concern in diagnostic radiography -very high levels & shouldn't be reached if radiation safety is practiced

Question 29

frequent public exposure dose limit-

Answer 29

-1 mSv/yr -100 mrem

Question 30

equivalent public exposure dose for lens of the eye-

Answer 30

-150 mSv/yr -1500 mrem/yr

Question 31

skin, hands, & feet public exposure dose limit-

Answer 31

-500 mSv/yr -5000 mrem/yr

Question 32

public exposure is accomplished w:-

Answer 32

barriers

Question 33

educational public exposure dose limit-

Answer 33

students under 18 may not receive more than 1 mSv (100 mrem) for course of their training

Question 34

reduction of occupational exposure mostly w:

Answer 34

-ALARA -time -distance -shielding

Question 35

monitoring occupational is done primarily w:-

Answer 35

monitoring devices

Question 36

radiation monitor offers-

Answer 36

NO PROTECTION against exposure

Question 37

monitoring devices (3)-

Answer 37

-Thermoluminescence Dosimeter (TLD) -Pocket Ionizingg Chamber -Optically Stimulated Luminescence (OSL)

Question 38

Thermoluminescence Dosimeter (TLD)

Answer 38

-lithium fluoride more sensitive & accurate, but more expensive -Provides no permanent record. -Can be worn up to 1 yr.

Question 39

Pocket Ionizing Chamber-

Answer 39

are accurate, but can’t be used for more than a couple days

Question 40

Optically Stimulated Luminescence (OSL)-

Answer 40

-most sensitive, accurate, & appx same size as TLD -Can only be measured 1x -Has ability to determine exposure of radiation received

Question 41

Reduction of Occupational Exposure- Protective Apparel (4)-

Answer 41

-must be- 0.25 mm Pb of equivalent -must be checked for cracks at least 1 per year -position of tech. during exams should be as far from scatter as practical -patient holding should be kept to minimum

Question 42

pregnant technologist-

Answer 42

-first inform supervisor -Becomes declared pregnancy -DL is 5 mSv for gestation pd. -wear monitor @ waist.

Question 43

management decisions for a pregnant technologist (3)-

Answer 43

-training -periodic in-service -counseling during pregnancy