| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for forming a basic integrated radiation shield for a PET(positron emission tomography) isotope manufacturing system for creating safe radiation environment. SOLUTION: This radiation shielding system is so constructed that first and second blocks 1, 2 constitute a main body for storing a cyclotron system, third and fourth blocks 3, 4 constitute a pair of tight doors for enclosing the cyclotron in the closed radiation shield, and the first block 1 is sealed by a casing formed by four molded blocks 1-4 to store a waste gas delay line embedded in the shielding material.
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