Cobalt-60 container scanner

This paper presents a special container scanner in which the radiation source is a conventional radiography
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Co projector of (100–300) × 3.7 × 10
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Bq. With a special sensitive amay detector, invented by Institute of Nuclear Energy Technology (INET) of Tsinghua University and other technical innovations, the characteristics of the
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Co scanner qualify it for use in container inspection. Its contrast indicator (CI) and image quality indicator (IQI) for 100 mm steel are equal to 0.7% and 2.5%, respectively, and the steel penetration (SP) is about 240 mm. The
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Co container scanner is rnch more economical and more reliable than those scanners using anaccelerator source. Also, its penetration ability is much better than that of an X-ray machine scanner. This paper presents the system design, the main difficulties and their technical solutions, the inspection characteristi cs and the special features of the
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Co scanner.