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In the course of our lives, we use agents and materials that pose both benefits and risks to our well being.
A few hours in the sun is pleasant and provides our bodies with essential vitamin D, but too long in the sun without protection can cause skin burning, pre-mature skin aging and increases our risk for skin cancer.
When risk and benefit co-exist, we manage the risk by keeping exposure to the agent or material to As Low As Reasonably Achievable. This is known as the ALARA principle.
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