Permissable Doses (5)

Question 1

What does NEW stand for?

Answer 1

Nuclear Energy Workers

Question 2

What does Non-NEW mean?

Answer 2

non- nuclear energy workers or members of the public

Question 3

Who is considered a NEW worker?

Answer 3

Under NSCA
- A person who is required via. business/occupation to be in connection with a nuclear substance or facility, they may receive a dose of radiation that is greater than prescribed for the public

Question 4

What does NEW replace?

Answer 4

ARW

Atomic Radiation Worker

Question 5

What is the ICRP?

Answer 5

Internation Commission on Radiological Protection (1928)

Question 6

What does the IRCP do?

Answer 6

provides recommendations and guidance on protection against ionizing radiation based on understanding of science of radiation exposure and effects

Question 7

What is the ICRP concerned with?

Answer 7

• Radiation Protection
• Protection of environment
• Maintaining knowledge and expertise in radiological protection

Question 8

What does the ICRP Advocate?

Answer 8

That any exposure to ionizing radiation can have adverse effects on health

Question 9

Three Fundamental Principles in ICRP 2010

Answer 9

• Justification
• Optimization
• Limitation

Question 10

ICRP - Justification

Answer 10

No justification for the use of ionizing radiation unless it can have a positive benefit

Question 11

ICRP - Optimization

Answer 11

Exposure to ionizing radiation must be kept as low as reasonably achievable (ALARA principle) with consideration to social and economic factors

Question 12

The ALARA Principle

Answer 12

as low as reasonably achievable

Question 13

ICRP - Limitation

Answer 13

Max acceptable occupational exposure must not promote risk to that person greater than the risk from working in any other “safe industry”.
- Annual dose must be limited and regulated

Question 14

What does MPD stand for?

Answer 14

Maximum Permissable Dose

Question 15

CNSC under ICRP dose rates

Answer 15

annual doses from background radiation 1.2mSv to 3.2mSv per year based on location.
Average Canadian receives approximately 2.0mSv from background radiation.

Question 16

What don’t dose limits take into account?

Answer 16

Doses from natural causes and medical procedures

Question 17

Effective dose limit section in CNSC

Answer 17

Section 13(1) CNSC Radiation Protection Regulations 2012

Question 18

What are the Effective dose limits?

Answer 18

NEW
- 50 mSv/ year with no more than 20mSv/year over a 5 year period (100mSv /5 years)

non-NEW
- 1 mSv

Question 19

CNSC Regulations for pregnancy as a NEW

Answer 19

Section 13(1) 
limit of 4mSv for a pregnant NEW for the "balance of pregnancy" (time from inform pregnancy to end of pregnancy)

Question 20

CNSC Regulations allowing to exceed the dose limit

Answer 20

Section 15(1)
dose limit can be exceeded if a person acts voluntarily to save another human life
(still cant exceed 500mSv and skin dose cant exceed 5,000mSv)

Question 21

CNSC Regulations that EDO have to ensure for non-NEW workers

Answer 21

an EDO must limit the dose for non-NEW workers to 0.1mSv per week and 0.5mSv per year

Question 22

What happens if a worker receives more than the limit?

Answer 22

An investigation occurs, results reported to CNSC

a NEW must always limit their exposure

Question 23

Where can Equivalent dose/weighing factors be found in the CNSC Regulations

Answer 23

Schedule 2

Question 24

Equivalent dose for organs Regulations

Answer 24

Some tissues are more impacted than others, weighing factors can apply to individual organs.

Schedule 1 CNSC Regulations

Whole body weighs as 1 = 42mSv

Hand, feet and lens of an eye have no weighing factors (Section 14 (1))

Question 25

Equivalent dose rate for organs (listed)

Answer 25

NEW

• skin = 500mSv
• Hands + feet = 500mSv
• Lens of the eye = 150mSv

non-NEW
- skin = 50mSv
- Hands + feet = 50mSv
- Lens of the eye +
= 15mSv