Applications of Research Reactors (IAEA TECDOC-1234)

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Ideally, it might consist of a boron shielded container or facility in which the stones are cooled by the flow of nitrogen gas. This latter device is expensive to operate. The irradiation could take place in an aluminium tube placed in a grid position and fixed at the upper reactor bridge structure. It could also take place in a beam tube. 3. Other facilities required After irradiation, a storage facility must be available for the stones until their radioactivity has decayed below the release limit.

The annual operating costs are minimal. 2. Motion radiography Motion (often called real time or dynamic) radiography uses geometric collimators, neutron energy filters, shutters and a television system and is capable of producing high resolution images in real time. 1. Flux/fluence required Real time neutron radiography does not have the ability to integrate the neutron exposure for the long periods of time necessary to obtain a statistically meaningful image in a low intensity 29 beam. This leads to the requirement of higher flux level than is required for static neutron radiography.

2. Reactor facilities required The only requirement is access to a very well characterized field of neutron or gamma radiation. Such a facility must make it easy to move the instruments in and out of the radiation field and to adjust them as necessary. This facility will normally be external to the reactor shielding. A radiation field monitor is necessary to indicate the actual dose received. 45 FIG. 15. An array of typical detectors than need testing and calibration. 3. Other considerations If calibrations are being performed, then there will usually be a need to have the facility certified or accredited by an appropriate national or international organization.

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