A Controlled Radiation Area (also known as a Radiation Control Zone) is a designated space where radiation levels may exceed specific safety limits, requiring restricted access and clear warning signage. While specific thresholds vary by country, Japanese regulations* define this as an area where the effective dose may exceed 1.3 millisieverts (mSv) over a three-month period.
For Matsusada Precision's cabinet-style X-ray inspection systems, the controlled radiation area is strictly contained within the shielded internal irradiation chamber. Because the leakage dose outside the cabinet is kept well below regulatory limits, the operator's workspace is typically not classified as a controlled area, allowing for easier integration into production lines and laboratories.
For more details on regulatory requirements, please refer to the Q&A section: "Is a license required for usage of X-ray inspection system?".
*Ordinance on Prevention of Ionizing Radiation Hazards
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