Dose trivia

Question 1

cumulative dose level to the lens of the eye for the development of cataracts

Answer 1

2 Gy

posterior pole

Question 2

annual dose limit to a member of the general public

Answer 2

100 mrem (1mSv)

2 mrem/hr (0.02 mSv/hr)

Question 3

background annual radiation dose

Answer 3

300 mrem (3 mSv)

Question 4

total effective occupational dose limi for a radiation worker

Answer 4

5000 mrem

50 mSv

(roughly 15 x the average background radiation dose to a member of the general public)

Question 5

dose limit to radiation worker’s extremity

Answer 5

500 mSv

50,000 mrem

Question 6

Mettler Ch 13 pearl

Annual occupational dose limits:

effective dose: __________

the eye:_________

any organ or tissue: __________

Answer 6

Annual occupational dose limits:

effective dose: 5 rem (50mSv)

the eye: 15 rem (150mSv)

any organ or tissue: 50 rem (500 mSv, 0.5 Sv)

Question 7

Mettler Pearl

public dose limits:

annually: _____________

per hour: ____________

Answer 7

public dose limits:

annually: 0.1 rem (1 mSv)

per hour: 2 mrem per hour (20 uSv per hour)

Question 8

mettler ch 13 pearl

permitted variation for an administered dose from the prescribed dose

Answer 8

+/- 20%

Question 9

Mettler Ch 13 pearl

definition of a medical event

Answer 9

A medical event must meet all these criteria:

• effective dose >5 rem (50mSv) OR an tissue/organ absorbed dose > 50 rem (500 mSv) - when you reached your occupational dose limit
• administed dose > 20% from prescribed
• wrong pharmaceutical, wrong route of administration, or wrong patient

Question 10

rules for release of pt given therapeutic I-131

Answer 10

• PATIENT IS SELF SUFFICIENT:
  
  • amount of administered activity or dose rate is < 33 mCi [1.2 GBq]…
  • OR pt dose at 1m measured with an ionization chamber is < 7 mrem per hour
• PATIENT RELIES ON A CAREGIVER:
  
  • caregiver will receive an effective dose < 0.5 rem

Question 11

annual dose limit to a member of the general public

Answer 11

100 mrem (1mSv)

2 mrem/hr (0.02 mSv/hr)

Question 12

background annual radiation dose

Answer 12

300 mrem (3 mSv)

Question 13

total effective occupational dose limi for a radiation worker

Answer 13

5000 mrem

50 mSv

(roughly 15 x the average background radiation dose to a member of the general public)

Question 14

dose limit to radiation worker’s extremity

Answer 14

500 mSv

50,000 mrem

Question 15

occupational dose for people < 18 (minors)

Answer 15

10% of the adult values

Question 16

At what exposures should you call the NRC within 24hrs?

Answer 16

1. Total effective dose equivalent 5 rem
2. Eye dose equivalent 15 rem
3. Shallow dose equivalent 15 rem

Question 17

At what dose exposure should you notify the NRC within 30 days?

Answer 17

annual limit dose excess of:

• occupational
• public
• embryo/fetal

Question 18

who gets a film badge?

Answer 18

individuals who receive a radiation dose in excess of 10% of the allowable occupational limits in 1 year

Question 19

what is the fetal dose limit if a worker does not declare her pregnancy?

Answer 19

there is no fetal dose limit if the pregnancy is not declared

Question 20

when does a patient receive written radiation safety guidelines

Answer 20

if the total effective dose equivalent to any other individual exceeds 1 mSv

Question 21

average American dose of radiation per year

Answer 21

6 mSv

3 mSv from background (Radon)

3 mSv from medical

Question 22

BEIR 7 cancer prediction

Answer 22

1 in 100 will get a solid cancer or leukemia from a does of 100 mSv above background

Question 23

17 year old receptionist in the nuclear medicine department. Dose limit?

Answer 23

1 mSv (public lmit)

Question 24

“radiation area” dose limit

Answer 24

0.05 mSv in 1 hr at 30cm

Question 25

“high radiation area”

Answer 25

any place you could get 0.1 rem (1mSv)in 1hr at 30 cm

Question 26

“very high radiation area”

Answer 26

any place you could get 500 rads (5 Gy) in 1 hr at 1 meter

Question 27

CFR stands fo

Answer 27

code of federal regulations

Question 28

10 CFR part 19

Answer 28

“inspections”

notices, instructions, and reports to workers

Question 29

10 CFR part 20

Answer 29

“radiation protection”

standards for protection against radiation

Question 30

10 CFR part 35

Answer 30

“human use of radioisotopes”

medical use of by-product material

Question 31

High LET radiation most likely to cause direct or indirect radiation?

Answer 31

DIRECT.

acts on DNA

Question 32

Low LET more likely to cause indirect or direct radiation?

Answer 32

INDIRECT

acts on water in cytoplasm creating free radicals which in turn damage DNA

Question 33

order of sensitivity of cells cycle

Answer 33

M > G2 > G1 > S

Question 34

risk of radiation induced cancer per dose in adults

Answer 34

5% per Sv

Question 35

risk of radiation induced cancer per dose in kids

Answer 35

15% per Sv per child

Question 36

For a radiation worker, what is the annual maximal occupational dose exposure to the hands?

Answer 36

500 mSv