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RadBall
The Radball is a 140 mm (5½") diameter deployable, passive, non electrical gamma hot-spot imaging device that offers a 360 degree view of the deployment area. The device is particularly useful in instances where the radiation fields inside a nuclear facility are unknown but required in order to plan a suitable nuclear decommissioning strategy. The device has been developed by the UK's National Nuclear Laboratory and consists of an inner spherical core made of a radiation sensitive material and an outer tungsten based collimation sheath. The device does not require any electrical supply or communication link and can be deployed remotely thus eliminating the need for radiation exposure to personnel. In addition to this, the device has a very wide target dose range of between 2 and 5,000 rads (20 mGy to 50 Gy) which makes the technology widely applicable to nuclear decommissioning applications.
==The device==
The device consists of two constituent parts, a gamma radiation sensitive inner core which fits inside the spherical tungsten outer collimation sheath. The outside diameter of the device is 140 mm (approx 5 ½ inch) which allows deployment in to hard to reach areas whilst providing a 360 degree view of the area. The inner core is made up of material which changes colour when it is exposed to gamma radiation. Therefore, when the device is deployed inside a radioactive environment the collimation device preferentially allows gamma radiation to pass through the collimation holes which deposits tracks within the inner core. These tracks can then be analysed to provide a 3D visualisation of the radioactive environment predicting both source location and intensity.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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