| 摘要 |
<PICT:0965227/C4-C5/1> Device for use in determining ionization radiation, e.g. X or g radiations, dosages based upon the measurement of the luminous energy liberated in the heating of a thermoluminescent substance previously irradiated by the radiations to be measured, comprises a nickel tube 2 coated by vitrefiable enamel with a layer of a thermoluminescent substance, e.g. calcium fluoride, and containing an electrical conductor 3 connected by conductors 4, 5 and pins 7, 8 on the base of a glass envelope 1 to a supply circuit. The envelope 1 is provided with an opaque plastic casing 11 having a removable cover 12. The casing 11 can be provided on its inside or outside surface or within its material with a layer 13 for absorbing radiation, e.g. of lead of thickness between 0.5 and 1 mm., preferably 0.7 mm. This layer absorbs radiation of energy lower than about 0.5 MeV so that a substantially linear response of the device is obtained. The removable cover 12 can also be provided with such a layer. A thermocouple can be disposed within the envelope close to the thermoluminescent coating. The envelope 1 can be provided with a metallic reflector. In order to measure the light energy stored in the thermoluminescent material under the action of ionizing radiations the cover 12 is removed from the casing 11 and the envelope 1 removed and rapidly introduced into a light measuring instrument. |
