Radiation Protection Spread Sheet

Question 1

How much does gonadal shielding reduce exposure to females

Answer 1

Up to 50%

Question 2

How much does gonadal shielding reduce exposure

Answer 2

Up to 95%

Question 3

What are the 3 ways Patient Dose is measured

Answer 3

Skin Entrance Exposure (ESE)
Mean Marrow Dose (MMD)
Genetically Significant Dose (GSD)

Question 4

Average Skin Entrance Exposure dose for a skull X-ray

Answer 4

2 mGy

Question 5

Average MMD for skull X-ray

Answer 5

0.1 mGy

Question 6

Average GSD for skull X-ray

Answer 6

<1 mGy

Question 7

Average ESE dose for chest X-ray

Answer 7

0.1 mGy

Question 8

Average MMD for chest X-ray

Answer 8

0.02 mGy

Question 9

Average GSD for chest X-ray

Answer 9

<1 mGy

Question 10

Average ESE dose for abdomen X-ray

Answer 10

4 mGy

Question 11

Average MMD for abdomen X-ray

Answer 11

0.3 mGy

Question 12

Average GSD for abdomen X-ray

Answer 12

1.25 mGy

Question 13

ESE for head CT

Answer 13

30 mGy

Question 14

MMD for head CT

Answer 14

0.2 mGy

Question 15

GSD for head CT

Answer 15

0.5 mGy

Question 16

ESE for abdomen CT

Answer 16

40 mGy

Question 17

MMD for abdomen CT

Answer 17

0.5 mGy

Question 18

GSD for abdomen CT

Answer 18

30 mGy

Question 19

Natural background radiation
-population exposure

Answer 19

Responsible for 82% of population exposure at an average annual rate of 0.295 mSv

Question 20

Natural background radiation
-radon gas

Answer 20

Of the background source, RADON GAS is greatest source responsible for 55%

Question 21

Man made radiation
-population exposure

Answer 21

18% of population exposure due to medical imaging average rate annual is 0.065 mSv

Question 22

Man made radiation
-CT

Answer 22

CT is 10% of medical imaging exam for the public

Question 23

Man made radiation
-public dose

Answer 23

Delivers over 70% of man made radiation public dose

Question 24

Dose Limit Occupational
Annually for stochastic effects

Answer 24

50 mSv

Question 25

Dose Limit Occupational Annually for lens of the eye

Answer 25

150 mSv

Question 26

Dose Limit Occupational Annually for localized area skin/hands/feet

Answer 26

500 mSv

Question 27

Lifetime Cumulative Effective Dose (CED)

Answer 27

Age in years x 10 mSv

Question 28

How much of the general public annual dose is also occupational dose

Answer 28

10%

Question 29

Dose limit annual for FREQUENT general public/non medical exposure

Answer 29

1 mSv

Question 30

Dose limit annual for INFREQUENT general public/non medical exposure

Answer 30

5 mSv

Question 31

Gestational period fetus dose -TOTAL GESTATIONAL PERIOD

Answer 31

5 mSv

Question 32

Gestational period fetus dose -PER GESTATIONAL MONTH

Answer 32

0.5 mSv

Question 33

Aluminum Radiography Filtration

Answer 33

2.5mm AL

Question 34

Aluminum Fluoroscopy Filtration

Answer 34

2.5 mm AL

Question 35

Minimum lead apron thickness

Answer 35

0.25 mm PB

Question 36

Recommended lead thickness (not minimum)

Answer 36

0.5 mm Pb

Question 37

Minimum thyroid shield lead thickness

Answer 37

0.5 mm Pb

Question 38

Minimum lead gonad shield thickness

Answer 38

0.5 mm Pb

Question 39

Minimum lead fluoro protective curtain thickness

Answer 39

0.25 mm Pb

Question 40

Minimum lead bucky slot cover thickness

Answer 40

0.25 mm Pb