| 摘要 |
PURPOSE:To securely indicate that the fitting screw of a collimator device is left unclamped forgetfully and to improve the safety by making the contact of a warning circuit when the fitting screw of the collimator device enters a specific clamping state. CONSTITUTION:The collimator device 41 is mounted on the detection surface side of a detector main body 3 for radiation detection by a screw 61 and inputs incident radiation selectively. The screw 61 has a columnar knob part 61a for screwing at its head part and a ring-shaped conductive layer 61c is formed on the reverse surface side of the knob part through an insulating layer 61b. A couple of contacts 41c and 41d made of a couple of elastic materials are provided on the surface of the collimator device 41 opposite to the conductive layer 61c across an insulating layer 41b. Further, the collimator device 41 is provided with a switch 91 which operates when contacting the detector 3. While the collimator device 41 is placed on the detector 3, the warning circuit operates by the closure of the switch 91 and when the clamping of the screw 61 enters the specific state, the conductive layer 61c touches contacts 41c and 41d to turn off the warning circuit, which stops warnings.
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