Miscellaneous

Question 1

for a population exposed to uniform whole body dose, genetic defects contribute what % to total detriment?

Answer 1

8% because wt = 0.08

Question 2

LD50

Answer 2

4 Gy without medical intervention

Question 3

lethal uniform whole body dose

Answer 3

5 Gy

Question 4

dose for temporary epilation

Answer 4

3-5 Gy
>7 Gy is permanent

Question 5

skin dose effects and ranges

Answer 5

2-5 Gy erytherma
5-10 Gy erythema, atrophy
10-15 Gy moist desquamation
> 15 Gy ulceration, edema, need surgery

Question 6

effect of fractionation on sterility in males

Answer 6

fractionation make sterility worse

Question 7

dose for permanent sterility

Answer 7

6 Gy males
10 Gy pre-pubescent females, 2 Gy pre-menopausal women

Question 8

risk of cancer for someone not exposed to radiation

Answer 8

30-50%

Question 9

risk of congenital malformation for someone not exposed to radiation

Answer 9

5%

Question 10

doubling dose

Answer 10

1 Gy

Question 11

sensitivity of newbors vs elders

Answer 11

newborns 3 x more sensitive than 25 yo and elders 3x less

Question 12

ICRP hereditary risks

Answer 12

0.1%/Sv working pop.
0.2%/Sv whole population

Question 13

how to calculate effective dose to worker from dosimeter

Answer 13

0.18 H collar
or
1.5Hwaist + 0.04 Hcollar

Question 14

typical dose received by radiation worker

Answer 14

2-5 mSv/y

Question 15

NCRP lifetime effective dose limit

Answer 15

10x age

Question 16

how much Pb lines xray rooms?

Answer 16

1.6 mm

Question 17

skin limit for workers

Answer 17

500 mSv over highest exposed 1 cm2 area

Question 18

Pb apron thickness

Answer 18

0.25-0.5 mm

Question 19

ICRP cancer risk value

Answer 19

5.5%/sV for all
4.1%/Sv for adults

then heritable effects are 0.2 and 0.1%/Sv, leaving total detriment at 5.7 and 4.2 %

Question 20

dose limit for students and techs training on DI equipment

Answer 20

1 mSv/y

Question 21

max leakage radiation from xray tube

Answer 21

1 mGy/h at 1 m from focal spot

Question 22

how long does a licensee have to inform the commission of someone representing the RSO for example or other changes in representation?

Answer 22

15 days before the change occurs

Question 23

prescribed limit for contamination

Answer 23

ny quantity of a radioactive nuclear substance
that may, based on the circumstances, increase a person’s effective dose by 1 mSv or more per year in excess
of the background radiation for the place or vehicle

Question 24

how long do you keep record of CNSC license?

Answer 24

-as specified in applicable regulations made under the Act, or
-one year after expiry of license

Question 25

when can someone dispose of a CNSC record?

Answer 25

-if no longer required to keep it by the Act
OR
-notify commission of date of disposal and conditions at least 90 days before disposal

Question 26

how long do you have to file report to the commission?

Answer 26

-preliminary report right away
-full report 21 days after becoming aware

Question 27

what is the date of filing of a report?

Answer 27

date it is received by commission

Question 28

security levels

Answer 28

categories I to 5

To assign a category, the total activity of all sources in one facility (storage or use) where sources are in close proximity must be equal to, or greater than, the number identified in the category. For example:

a teletherapy medical device with a sealed source up to 555 TBq of cobalt-60 is a Category 1 source (555 > 30)
a certified radiography exposure device with a sealed source of 2.5 TBq of iridium-192 is a Category 2 sealed source (80 > 2.5 > 0.8)
a high dose rate (HDR) brachytherapy medical device with a sealed source up to 0.44 TBq of iridium-192 is a Category 3 source (0.8 > 0.44 > 0.08)

For security control purposes, the aggregation of sources in a single storage (or use) facility can be used to determine a security category. This is done by adding the actual sealed source activities of the sources and determining the category from Table 1. For example, one industrial level gauge containing a sealed source with 0.19 TBq of cesium-137 is a Category 3 source (1.0 > 0.19 > 0.1). However, when there are six of these sealed sources at a single licensed location, for security reasons they may be treated as a Category 2 source (6 x 0.19 = 1.1 > 1.0).

Question 29

Safety code 35 annual limit

Answer 29

20 mSv/year

Question 30

IDR outside of nuc med room

Answer 30

< 2.5 uSv/h

Question 31

shielding for electrons only

Answer 31

just concrete
can’t have Pb would create issue
has to be low Z

Question 32

lifetime dose limit for ICRP vs NCRP

Answer 32

ICRP 1 Sv
NCRP 10 mSv times age

Question 33

density of concrete

Answer 33

2.2- 2.4 g/cm3
heavy is 4.81 g/cm3