Candidates to replace R-12 as a radiator gas in Cherenkov detectors

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:425

Article

Harvey, Allan H.¹  Paulechka, Eugene¹  Egan, Patrick F.² 

[1] NIST, Appl Chem & Mat Div, 325 Broadway, Boulder, CO 80305 USA

[2] NIST, Engn Phys Div, 100 Bur Dr, Gaithersburg, MD 20899 USA

关键词: Cherenkov detector;    F-compounds;    Halocarbons;    Refractive index;   

DOI  :  10.1016/j.nimb.2018.04.006

来源: Elsevier

【 摘 要 】

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) (trans-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.

【 授权许可】

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