用于切伦科夫探测器中替代R-12作为散热气体的候选物质。
Candidates to Replace R-12 as a Radiator Gas in Cherenkov Detectors.
作者信息
Harvey Allan H, Paulechka Eugene, Egan Patrick F
机构信息
Applied Chemicals and Materials Division, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Engineering Physics Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA.
出版信息
Nucl Instrum Methods Phys Res B. 2018 Jun;425:38-42. doi: 10.1016/j.nimb.2018.04.006. Epub 2018 Apr 14.
Dichlorodifluoromethane (R-12) has been widely used as a radiator gas in pressure threshold Cherenkov detectors for high-energy particle physics. However, that compound is becoming unavailable due to the Montreal Protocol. To find a replacement with suitably high refractive index, we use a combination of theory and experiment to examine the polarizability and refractivity of several non-ozone-depleting compounds. Our measurements show that the fourth-generation refrigerants R-1234yf (2,3,3,3-tetrafluoropropene) and R-1234ze(E) (-1,3,3,3-tetrafluoropropene) have sufficient refractivity to replace R-12 in this application. If the slight flammability of these compounds is a problem, two nonflammable alternatives are R-218 (octafluoropropane), which has a high Global Warming Potential, and R-13I1 (trifluoroiodomethane), which has low Ozone Depletion Potential and Global Warming Potential but may not be sufficiently inert.
二氯二氟甲烷（R - 12）已被广泛用作高能粒子物理压力阈值切伦科夫探测器中的散热气体。然而，由于《蒙特利尔议定书》，该化合物正变得难以获取。为了找到具有适当高折射率的替代品，我们结合理论和实验来研究几种非消耗臭氧层化合物的极化率和折射率。我们的测量表明，第四代制冷剂R - 1234yf（2,3,3,3 - 四氟丙烯）和R - 1234ze(E)（-1,3,3,3 - 四氟丙烯）具有足够的折射率来替代该应用中的R - 12。如果这些化合物的轻微可燃性是个问题，两种不可燃的替代品是全球变暖潜能值较高的R - 218（八氟丙烷），以及臭氧消耗潜能值和全球变暖潜能值较低但可能不够惰性的R - 13I1（三氟碘甲烷）。
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