What does 'external exposure' mean?

'External exposure' refers specifically to radiation exposure resulting from sources that are outside the body. This can include radiation from various sources such as cosmic rays, radon gas, or man-made sources like x-ray machines and radiation therapy equipment. It is distinct from internal exposure, which occurs when radioactive substances are ingested or inhaled, leading to radiation exposure from within the body itself.

The definition of external exposure is central to understanding occupational safety in environments where radiation is prevalent, as it emphasizes the need for protective measures against sources that emit radiation externally. Understanding the distinction is crucial for determining appropriate safety protocols and response actions in scenarios involving radiation.