Patent Number: 
Section: claims

1. A mechanical device for supporting and attaching at least one probe for detecting ionizing radiation characterized in that it includes, for each detection probe, a probe-holder ending in a collimator-holder able to support a collimator intended to delimit a field of observation of the detection probe, an attachment device intended to be attached to a glove port of a glove box, where the probe-holder, or each probe-holder, cooperates with the said attachment device and also a collimator and attachment means for attaching the collimator to the collimator-holder of the cylinder-cylinder fitting type, with at least one ball plunger intended to come to a stop against a notch held either by the collimator-holder, or by the collimator to prevent the collimator from rotating or sliding relative to the collimator-holder, where the collimator can be detached so as to be able to adjust a field of observation of the detection probe. 2. A mechanical device according to claim 1, in which the collimator-holder is provided with locking means for preventing the detection probe from sliding or rotating relative to the collimator-holder. 3. A mechanical device according to claim 1, in which the attachment device includes a central portion, through which the probe-holder passes, where this central portion is edged with a flange fitted with attachment means intended to cooperate with combined attachment means held by the glove port of the glove box, where these attachment means are of the bayonet or claw type. 4. A mechanical device according to claim 1, in which the attachment device includes locking means to prevent the probe-holder from sliding or rotating. 5. A mechanical device according to claim 1, in which the attachment device includes locking means to prevent the central portion from sliding or rotating relative to the flange. 6. A mechanical device according to claim 1, in which the attachment device is fitted with a bubble level. 7. A nuclear material monitoring device placed in a glove box, characterized in that it includes a mechanical support and attachment device according to claim 1, at least one ionizing radiation detection probe placed in the probe-holder, where this ionizing radiation detection probe has a detector which is sensitive to the ionizing radiation which is emitted from the collimator-holder, and a system for processing and displaying a signal delivered by the ionizing radiation detection probe. 8. A nuclear material monitoring device according to claim 7, in which the detector is housed in the collimator, when the collimator is attached to the collimator-holder. 9. A nuclear material monitoring device according to claim 7, in which the ionizing radiation detection probe is an X and/or gamma spectrometry probe. 10. A nuclear material monitoring device according to claim 7, in which the detector is made of CdTe or CdZnTn. 11. A glove box characterized in that it is fitted with a nuclear material monitoring device according to claim 7.