Controlled Radiation Areas are also known as Radiation Control Zones. Japan's Ordinance defines a controlled radiation area for the Prevention of Ionizing Radiation Hazards as an area where the dose may exceed 1.3 millisieverts per three months. It also stipulates that this controlled area must be clearly marked by signs.
In Matsusada Precision's X-ray inspection system, the internal X-ray irradiation area is a controlled area.
For more information, see Q&A, "Is a license required for usage of X-ray inspection system?".
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