| 摘要 |
PROBLEM TO BE SOLVED: To obtain a phantom device by which the labor of a phantom calibration operation and procedure to be shouldered by an operator is reduced and by which a radiation exposure amount is reduced by installing a control device or the like which adjusts the concentration of a radioactive material (RI) inside a phantom body. SOLUTION: A CPU 13 (a control device) opens a valve 14 on the basis of the concentration value of an RI inside a tube 12, and the RI from the tube 12 is stored inside a reservoir tank 11. An RI solution which is diluted inside the reservoir tank 11 is supplied into a phantom body 1 by a pump 8, and it is circulated between the phantom body and the reservoir tank 11 via tubes 6, 7. At this time, the reservoir tank 11 functions as the storage container of the RI solution, and it acts to adjust and buffer a solution quantity. Since the amount of the RI solution is reduced with the passage of time due to its attenuation, the RI solution which is supplied via the tube 12 is adjusted by controlling the opening and shutting operation of the valve 14 by the CPU 13. Thereby, the concentration of the RI solution inside an apparatus can be maintained to be constant, or it can be changed for a predetermined time.
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