Safety Signs And Equiptment Flashcards
Do warning lights indicate the presence of radiation?
Warning lights do not necessarily indicate the presence of radiation.
What’s the difference between a warning light and a beam on monitor?
Warning lights do not necessarily detect radiation.
Beam on monitors are independent of the machine and detect radiation regardless of what is indicated by the warning light.
Beam on monitors can operate in the case of an electrical failure
Where are emergency off buttons located? What does it do?
Treatment room walls
Treatment couch
Near the exit
Control panel
Cuts off electrical power from the treatment machine
What sign is required when the quantity of radionuclide exceeds the activity specified in regulations?
RADIOACTIVE MATERIAL sign is required.
When is a ‘CAUTION - RADIATION AREA’ sign necessary?
When an employee could receive in any 1 hour a dose in excess of 5 mrem or greater than 100 mrem in 5 consecutive days.
What signs are necessary when dose rate exceeds 100 mrem per hour?
‘CAUTION HIGH RADIATION AREA’ or ‘CAUTION AIRBORNE RADIOACTIVITY AREA’ signs are necessary.
What conditions require ‘CAUTION HIGH RADIATION AREA’ or ‘CAUTION AIRBORNE RADIOACTIVITY AREA’ signs?
When dose rate exceeds 100 mrem per hour and for areas where concentrations of radioactivity in air exceed certain standards specified in regulations.
What are dosimeters?
Instruments and devices designed to detect and/or measure radiation.
What are the types of dosimeters?
- Gas-filled chambers
- Thermoluminescent dosimeters (TLDs)
- Neutron detectors
What is Pulse/Rate mode?
Indicates presence of radiation.
What is Integrate Mode?
Measures intensity of radiation.
What is an Ionization Chamber?
A gas filled detector that works by counting ion pairs.
What does an Ionization Chamber measure?
It is used to determine an exposure in air per hour.
What components does an Ionization Chamber have?
It has 2 electrodes carrying a voltage across.
What types of radiation can an Ionization Chamber detect?
It can detect high energy x-rays, gamma rays, and beta particles.
What are the applications of an Ionization Chamber?
It is used to calibrate linear accelerators and measure treatment beam characteristics.
Where is an Ionization Chamber used in a linear accelerator?
It is used as a monitor chamber.
What ionization chambers be corrected for with a certain factor?
Room temperature and barometric pressure
T-P correction factor
What is a Cutie pie or portable ionization chamber used for?
It is used to measure dose rate from an implanted patient and their room.
What is another use of the Cutie pie or portable ionization chamber?
It surveys in and around the storage area in which radioactive materials are kept.
What is the purpose of a Geiger-Muller Counter?
It detects gamma and beta radiation rather than determining exposure rate.
What types of radiation can a Geiger-Muller Counter detect?
Even low levels of
X ray, Gamma, alpha and beta radiation.
What does ‘continuous’ refer to in the context of radiation detection?
It refers to the ongoing measurement of radiation.
What can Geiger Miller counter be used for?
Find lost radioactive seeds or ribbons
Search for holes in walls of linear accelerator room
In room radiation monitor
