Reference

Effect of gas composition on the response of a thick-source alpha particle gas densimeter

Effect of gas composition on the response of a thick-source alpha particle gas densimeter. Fjeld, Robert A.; Johnson, Randall M.; McFarland, Andrew R. (Dep. Environ. Syst. Eng., Clemson Uhniv., Clemson, SC 29631, USA). Rev.Chemicals with cas numbers 1333-74-0 and 7440-37-1 also play role. Sci. Instrum., 55(2), 244-9 (English) 1984. CODEN: RSINAK. ISSN: 0034-6748. DOCUMENT TYPE: Journal CA Section: 47 (Apparatus and Plant Equipment) The results of a theor. and exptl. study of the gas-compn. effect on the response of a thick-source alpha gas densimeter are presented. A math. description of gage response is developed and used to predict the response of a Po-210 densimeter. Gage response is measured with pure gases (He, CH4, N2, CO2, Ar) and gaseous mixts. having densities of 0.3-1.3 k/m3. Qual. predictions of the dependence of gage response on the gas compn., based on heuristic arguments, are verified exptl. and theor. At a given d., the response increases with increasing at. no. (Z) and decreasing ratio of Z to at. wt. The gas-compn. effect on gage response is more pronounced with low-Z than high-Z gases. The presence of H in a gas sample significantly decreases gage response. Theor. predictions show very good agreement with exptl. measurements. The total response uncertainty is calcd. for gases having at. nos. near Z = 7. The uncertainty of the d. measurement is <2.5% at a d. of 1 kg/m3. .

Dynamics of a geothermal field traced by noble gases: Cerro Prieto, Mexico

Dynamics of a geothermal field traced by noble gases: Cerro Prieto, Mexico. Mazor, E.; Truesdell, A. H. (Weizmann Inst. Sci., Rehovot, Israel). Geothermics, 13(1-2), 91-102 (English) 1984. CODEN: GTMCAT.There are some reagents with their cas registry numbers 7440-37-1 and 7440-01-9 are used in this study. ISSN: 0375-6505. DOCUMENT TYPE: Journal CA Section: 53 (Mineralogical and Geological Chemistry) Section cross-reference(s): 52 The concns. were detd. of He, Ne, Ar, Kr, and Xe, mass spectrometrically, in water samples collected during 1977 from producing wells at Cerro Prieto. Pos. correlations between concns. of radiogenic (He and 40Ar) and atm. noble gases (Ne, Ar and Kr) suggest the following dynamic model: the geothermal fluids originated from meteoric water that penetrated to >2500 m depth (below the level of first boiling) and mixed with radiogenic He and 4Ar formed in the aquifer rocks. Subsequently, small amts. of steam were lost by a Raleigh process (0-3%) and mixing with shallow cold water occurred (0-30%). Noble gases are sensitive tracers of boiling in the initial stages of 0-3% steam sepn. and complement other tracers, such as Cl or temp., which are effective only beyond this range. .