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ALARA stands for “as low as reasonably achievable”. This principle means that even if it is a small dose, if receiving that dose has no direct benefit, you should try to avoid it. To do this, you can use three basic protective measures in radiation safety: time, distance, and shielding.
Time
Time refers to the amount of time you spend near a radiation source.
Minimize your time near a radiation source to only as long as it takes to accomplish a task.
First responders can use alarming dosimeters to help them minimize the amount of time they are in an area with elevated radiation levels.
Distance
Distance refers to how close you are to a radiation source.
Maximize your distance from a radioactive source as much as possible.
If you increase your distance from a radiation source, you will decrease your dose.
Radiation and Your Health
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Radiation and Your Health
Radiation Safety
The guiding principle of radiation safety is “ALARA”. ALARA stands for “as low as reasonably achievable”. This principle means that even if it is a small dose, if receiving that dose has no direct benefit, you should try to avoid it. To do this, you can use three basic protective measures in radiation safety: time, distance, and shielding.
illustration of clock
Time
Time refers to the amount of time you spend near a radiation source.
Minimize your time near a radiation source to only as long as it takes to accomplish a task.
First responders can use alarming dosimeters to help them minimize the amount of time they are in an area with elevated radiation levels.
Learn More
illustration of clock
Distance
Distance refers to how close you are to a radiation source.
Maximize your distance from a radioactive source as much as possible.
If you increase your distance from a radiation source, you will decrease your dose.
Learn More
illustration of white shield against black background
Shielding
In a radiation emergency you may be asked to get inside a building and take shelter for a period of time.
To shield yourself from a radiation source, put something between you and the source.
In a radiation emergency, officials may instruct you to get inside and put as many walls between you and the outside as possible. This is another way to use shielding.
Protective clothing can shield first responders from alpha and beta particles, but will not protect them from gamma rays. Standing behind a wall or a fire truck can also serve as a shield.
Trustee at the Institute of Physics and Engineering in Medicine (IPEM)
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