| 摘要 |
A radiation dosimeter comprises a thermoluminescent material (e.g. calcium fluoride) mounted on a support, and a heater; the thermal path from the support to the free surface of the luminescent material increases from the edges of the material to its centre, so that, with uniform heating, the whole of the free surface of the luminescent material reaches its emission temperature at the same time. This enables the radiation dose to be recorded by observing the peak light emission of the dosimeter, rather than integrating its light emission over the whole heating period. In embodiments, the heater may be a resistive plate, e.g. of carbon, or a radiating filament, and the thermal path may be lengthened by either increasing the thickness of the luminescent layer (e.g. 90 micron at the edges, 150 micron at the centre) or by increasing the thickness of the central portion of a non-metallic support. |
