What is ALARA?
ALARA is an acronym that stands for “As Low As Reasonably Achievable”, and is a principle applied to radiation safety in the workplace. It is the guiding principle in all radiation protection and is used to limit radiation exposure and protect workers and the environment.
How ALARA is used in radiation safety
ALARA is used in radiation safety to minimize the amount of radiation to which workers, as well as the general public, are exposed. It includes activities such as:
- Using proper engineering controls, such as shields and safety barriers
- Using the least amount of radiation necessary for a given task
- Ensuring that employees are adequately trained in radiation safety practices
- Wearing appropriate protective clothing
- Keeping radiation sources properly shielded or stored
- Monitoring workers for potential exposure and providing medical monitoring, as appropriate
The ALARA principle is based on the premise that radiation exposure should be kept as low as possible, while still being able to accomplish their necessary tasks. In order to accomplish this, radiation sources must be controlled, monitored and safeguarded in order to reduce potential exposure to workers and the public.
The importance of ALARA
The importance of the ALARA principle cannot be overstated. By minimizing radiation exposure, workers and the public are protected from the potential health risks associated with radiation. In addition, it helps ensure that safety regulations are being followed and that radiation sources are properly controlled and monitored.
The ALARA principle is a critical standard for radiation safety and should be adhered to at all times. All workers must be adequately trained in the ALARA principle in order for it to be most effective. Following the ALARA principle can help reduce the risks of radiation exposure and ensure the safety of workers, the environment, and the general public.
Three Principles Of ALARA-
To minimize radiation dose, you can use three basic protective measures in radiation safety: time, distance, and shielding.
Time-
“Time” simply refers to the amount of time you spend near a radioactive source. Stay near a radioactive source only as long as is necessary to get the job done. If you are in an area with elevated radiation,
- Minimize the time of exposure
- Do your work as quickly as possible and then
- leave the area.
Distance-
Exposure(E)∝ 1/Distance (d)²
Double the distance between your body and the radiation source; this reduces the radiation exposure by a factor of 4.
Shielding-
The most effective shielding will depend on what kind of radiation the source is emitting. Some radionuclides emit more than one kind of radiation. Use absorber materials such as Plexiglas for beta particles and lead for X-rays and gamma rays.
