Mountford P J, Davies V J
Department of Medical Physics, Kent and Canterbury Hospital, England.
Clin Phys Physiol Meas. 1987 Nov;8(4):325-35. doi: 10.1088/0143-0815/8/4/005.
Three versions of the Dexter 2M miniature multijunction thermopile were evaluated for the radiometry of clinical ultraviolet radiation (UVR) sources. The acceptance angle had been increased in two of these devices, and one also contained an additional ceramic heat sink under its receiver element. Measurements were made of their absolute sensitivity and linearity, and their response to various UVR sources was compared to that of Hilger Schwarz FT17 and FT32 vacuum compensated thermopiles. Both of the acceptance angle modifications yielded an angular response less than that of the wide-angle FT32 thermopile. The additional ceramic heat sink diminished, but did not eliminate, the initial surge in the 2M thermopile output voltage following exposure. Under constant irradiance, the 2M output voltage was stable after the initial surge had decayed, even without the additional heat sink. It was concluded that irradiance measurements should be made after the output voltage had stabilised. Any version of the 2M thermopile could be used for relative day-to-day monitoring of all UVR sources, and the version with the widest acceptance angle could be used for the absolute radiometry of certain extended sources.
对Dexter 2M微型多结热电堆的三个版本进行了评估，以用于临床紫外线（UVR）源的辐射测量。其中两个版本的接收角有所增大，还有一个版本在其接收元件下方额外增加了一个陶瓷散热器。对它们的绝对灵敏度和线性度进行了测量，并将它们对各种UVR源的响应与Hilger Schwarz FT17和FT32真空补偿热电堆的响应进行了比较。接收角的两种改进所产生的角响应均小于广角FT32热电堆的角响应。额外的陶瓷散热器减少了，但并未消除，2M热电堆输出电压在曝光后的初始激增。在恒定辐照度下，即使没有额外的散热器，2M输出电压在初始激增衰减后也是稳定的。得出的结论是，应在输出电压稳定后进行辐照度测量。2M热电堆的任何版本都可用于对所有UVR源进行相对的日常监测，而接收角最宽的版本可用于某些扩展源的绝对辐射测量。
