| 摘要 |
PURPOSE:To dispense with liquid nitrogen while making noise components hard to overlap a signal from a radiation detection element by employing a thermoelectric coolor utilizing the Peltier effect of a semiconductor to cool a radiation detector. CONSTITUTION:Thermoelectric coolors 15a are connected in multiple stages at the bottom of a radiation element 1 to reduce the detection element 1 to a low temperature level. Then, the undersurface of the detection element 1 is cooled with the coolor 15a. Heat deprived of by the detection element 1 is absorbed by a coolor 15b via an internal cylinder 17 and transmitted to a lower flange 18. Then, the heat is transmitted to a fin 19 and dissipated by aircooling. On the other hand, the external cylinder 20 is made vacuum inside to prevent the transfer of heat depending on convection. The internal cylinder 17 is arranged to prevent radiant heat to the detection element 1 from the external cylinder 20. In addition, the use of O rings 23 and 24 generates a pressure between the undersurface of the cylinder 17 and the top surface of the coolor 15b and the undersurface of the coolor 15b and the top surface of a lower flange thereby improving the cooling efficiency with a better thermal contact. |
