Patent Number: 
Section: claims

1. A radiation detector comprising:a main body;a radiation probe detachably attached to the main body; anda collimator for collimating radiation, the collimator being provided in the distal end portion of the radiation detection probe,the radiation detection probe having: a detection unit including a radiation detection element; a first terminal electrically connected to the radiation detection element; and a cap-shaped shield member mounted to the detection unit so as to cover the radiation detection element, the shield member being made of a material which blocks the radiation, the shield member having a front wall facing the radiation detection element, and a cylindrical side wall extending from the edge of the front wall, the collimator being a through-hole provided in the front wall,the main body having a connector to which the proximal end of the radiation detection probe is detachably mounted, the connector including a second terminal which is detachably connected to the first terminal when the radiation detection probe is mounted to the connector,the radiation detection probe further having:a cap-shaped probe cover which covers the shield member and the detection unit, the probe cover being detachably mounted to the connector; anda seal ring sandwiched between the probe cover and the connector to seal the main body and the radiation detection probe when the probe cover is mounted to the connector. 2. A radiation detector according to claim 1, whereinthe detection unit has an input face which faces the collimator and transmits the radiation, andthe radiation detection element is arranged so as to receive the radiation which has passed through the input face. 3. A radiation detector according to claim 1, whereinthe shield member is disposed in the probe cover to allow a hollow portion of the shield member and a hollow portion of the probe cover to communicate with each other, andthe detection unit is fitted into these hollow portions which communicate with each other. 4. A radiation detector according to claim 3, wherein the shield member is detachably provided in the probe cover. 5. A radiation detector according to claim 3, wherein the shield member is fixed in the probe cover. 6. A radiation detector according to claim 1, whereinthe probe cover has a cap-shaped first component detachably mounted to the connector, a cap-shaped second component detachably attached to the first component to accommodate and fix the shield member, and a seal ring sandwiched between the outer surface of the first component and the inner surface of the second component to seal the probe cover when the second component is attached to the first component, andthe second component is attached at positions variable along the axis of the probe cover. 7. A radiation detector according to claim 1, whereinthe probe cover has an input plate facing the front wall of the shield member to close an end of the collimator, and a cylindrical side wall extending from the edge of the input plate to surround the side surfaces of the shield member and the detection unit, andthe input plate is made of a material which transmits the radiation and blocks an electromagnetic wave having an energy of 1 keV or less. 8. A radiation detector according to claim 1, whereinthe detection unit has a casing for accommodating the radiation detection element,an opening is provided on the distal end of the casing so as to extend from an end face of the casing toward the radiation detection element, andthe opening has substantially the same cross-section as that of the collimator and communicates with the collimator. 9. A radiation detector comprising:a main body;a radiation detection probe detachably attached to the main body; anda collimator for collimating radiation, the collimator being provided in the distal end portion of the radiation detection probe,the radiation detection probe having a detection unit including a radiation detection element, and a first terminal electrically connected to the radiation detection element,the main body having a connector to which the proximal end of the radiation detection probe is detachably mounted, the connector including a second terminal which is detachably connected to the first terminal when the radiation detection probe is mounted to the connector,the radiation detection probe further having:a cap-shaped probe cover which covers the detection unit, the probe cover being detachably mounted to the connector; anda seal ring sandwiched between the probe cover and the connector to seal the main body and the radiation detection probe when the probe cover is mounted to the connector,the probe cover being made of a material which blocks the radiation,the collimator being an opening provided on the distal end of the probe cover to extend toward the radiation detection element,the radiation detector further comprising an input plate for closing an end of the collimator, the input plate being provided on the distal end surface of the probe cover, and the input plate being made of a material which transmits the radiation and blocks an electromagnetic wave having an energy of 1 keV or less. 10. A radiation detector according to claim 9, whereinthe detection unit has an input face which faces the collimator and transmits the radiation, andthe radiation detection element is arranged so as to receive the radiation which has passed through the input face. 11. A radiation detector comprising:a main body;a radiation detection probe detachably attached to the main body; anda collimator for collimating radiation, the collimator being provided in the distal end portion of the radiation detection probe,the radiation detection probe having a detection unit including a radiation detection element, and a first terminal electrically connected to the radiation detection element,the main body having a connector to which the proximal end of the radiation detection probe is detachably mounted, the connector including a second terminal which is detachably connected to the first terminal when the radiation detection probe is mounted to the connector,the connector further including a support bar protruding from the distal end of the main body and being thinner than the radiation detection probe, andthe support bar having a proximal end connected to the distal end of the main body and a distal end connected to the radiation detection probe. 12. A radiation detector according to claim 11, whereinthe detection unit has an input face which transmits the radiation,the radiation detection element is arranged so as to receive the radiation which has passed through the input face, andthe collimator is an opening which faces the input face. 13. The radiation detector according to claim 11, whereinthe connector further includes a slide member slidably attached to the support bar, andthe collimator moves along with the slide member, and the distance between the collimator and the radiation detection element varies went the slide member slides relative to the support bar. 14. A radiation detector comprising:a main body;a radiation detection probe detachably attached to the main body; anda collimator for collimating radiation, the collimator being provided in the distal end portion of the radiation detection probe,the radiation detection probe having a detection unit including a radiation detection element, and a first terminal electrically connected to the radiation detection element,the main body having a connector to which the proximal end of the radiation detection probe is detachably mounted, the connector including a second terminal which is detachably connected to the first terminal when the radiation detection probe is mounted to the connector,one of the first and second terminals including a plurality of pins having different fitting lengths and different polarities, and the other including a plurality of sockets into which the plurality of pins are fitted, the plurality of sockets having fitting lengths and polarities corresponding to the plurality of pins. 15. A radiation detector according to claim 14, whereinthe detection unit has an input face which transmits the radiation,the radiation detection element is arranged so as to receive the radiation which has passed through the input face, andthe collimator is an opening which faces the input face. 16. A radiation detector comprisinga main body, anda radiation detection probe detachably attached to the main body,the radiation detection probe having a radiation detection element, a first terminal electrically connected to the radiation detection element, a cylindrical element cover surrounding the radiation detection element, and a cylindrical casing for accommodating the element cover,the main body having a connector to which the proximal end of the radiation detection probe is detachably mounted, the connector including a second terminal which is detachably connected to the first terminal when the radiation detection probe is mounted to the connector,the element cover being made of a material which blocks radiation, andthe radiation detection element being disposed behind the distal end of the element cover. 17. A radiation detector according to claim 16, further comprising a fastener detachably mounted to the main body to fasten the radiation detection probe to the connector. 18. A radiation detector according to claim 17, further comprising a seal ring sandwiched between the fastener and the connector to seal the main body when the fastener is mounted to the connector. 19. A radiation detector according to claim 16, whereinan input plate facing the radiation detection element is provided on the distal end surface of the casing, andthe input plate is made of a material which transmits the radiation and blocks an electromagnetic wave having an energy of 1 keV or less.