Outcome 1 Flashcards
What are the three types of radiation exposure?
- Background
- Medical
- Occupational
What are the two sources of background radiation?
- Natural
- Artificial
What are examples of natural radiation?
- atmospheric/cosmic
- terrestrial/soil
- ingestion/internally
- inhalation
What are some examples of elements found in soil?
Uranium-238 and Thoron and other daughters
What are some examples of elements that are found internally?
P-40: in red meats
Ra-226 in water
C-14 co2
What is the largest source of natural radiation?
Radon Rn-222 and Thoron Rn-220
What are examples of artificial radiation?
- Nuclear fallout
- industrial sources
- medical
What’s the largest source of man made radiation?
Medical treatments/equipments
Are medical radiation exposure doses regulated by CNSC?
No.
What is DOSE OPTIMIZATION?
Correct dosage based on the condition of the patients (eg. pregnant)
What is ALARA?
As low as reasonably achievable
What is the rationale used for use of radiation for diagnostic procedures?
Benefit vs. Risk
Treatment can be palliative or radical. What is the difference?
Palliative is for comfort/to ease patients’ suffering
Radical is to treat/to attempt to cure of disease
What type of EMR is used for diagnostics? Therapeutic?
Diagnostics = x-rays and gamma rays
Therapy = alpha and beta
What is occupational radiation exposure mean?
It is the exposure due to the nature of one’s job
Does CNSC regulate occupational rad exposure?
Yes. By requiring licensing and regulating the employees
What is NEW?
Nuclear energy worker
What is the effective dose limits (EDL) for a NEW?
50 mSv/yr or 100 mSv/5 yrs
EDL does include medical rad exposure and background rad exposure. T/F
False
What is the EDL for the public?
1 mSv/yr
What are some benefits of NM?
- able to view how there body is functioning/early discovery/diagnosis
- personalization of treatments
- used to kill cancer cells with minimal tissue damage
What is the Equivalent dose limits for LENS OF EYES?
NEW: 50 mSv/yr
Public: 15 mSv/yr
What is the equivalent dose limits for SKIN?
NEW: 500 mSv/yr
Public: 50 mSv/yr
What is the equivalent dose limit for HANDS/FEET?
NEW: 500 mSv/yr
Public: 50 mSv/yr
What is the ambient dose limit?
NEW: 25 uSv/h
Public: 2.5 mSv/h
What is teletherapy?
Multiple beams of radiation being administered by a machine that is positioned some distance away from the patient.
What is instillation therapy?
Injection of radioactive source into a body cavity.
Allows for localization in a membrane
What is brachytherapy?
Placing radioactive sealed sources inside or next to the area that requires treatment
