A new site for 85Kr measurements on groundwater samples

Comparison of 85Kr and 3H Apparent Ground‐Water Ages for Source Water Vulnerability in the Collyer River Catchment, Maine1

“…The time series reconstruction is afterDraxler (1982) with an inverse Fourier transformation of the measured and calculated 85 Kr activities. The resultant 85 Kr input function is 1.31 mBq ⁄ m 3 STP for precipitation recharging the ground water in the Collyer River catchment during2001-2004 Kr activity is higher than the International Atomic Energy Agency model values of 1.21 mBq ⁄ m 3 STP(Figure 4)for the northeastern United States and Canadian Maritimes.…”

“…This requires about 95 minutes on average per well. For the direct well sampling approach, the preferred method employs an aspirator-type extractor after Morgenstern and Hebert (1991) and Lange and Hebert (2001), with a bubbler, and with over pressure recirculation through a series of traps. Initially, a venturi-type jet nozzle assists degassing as He and sample water pass through this recirculating extractor column.…”

Apparent 85Kr ages of groundwater within the Royal watershed, Maine, USA

“…Kr extraction with direct sampling from a packed-off, well-screen interval having a water flow rate z 1 L min À1 , and a He (g) flow rate of 2.8 L min À1 , requires z95 min on average for each well in the catchment. In this direct well sampling approach, the preferred method employs an aspirator-type extractor (Morgenstern and Hebert, 1991;Lange and Hebert, 2001) with a bubbler, and with over pressure recirculation through a series of traps. Initially, a venture-type jet nozzle assists degassing as He and sample water pass through this recirculating extractor column.…”

Groundwater Contamination Studies by Environmental Isotopes: A review

“…For the sake of brevity, radiometric age dating of water with 3 H, 14 C, 81 Kr, and 36 Cl has been omitted in this chapter, being rather marginal to the context. The reader may refer to the following papers, which are specifically addressed to the topics related to water dating: e.g., Morgenstern et al [5] and Stewart et al [6] (tritium), Schiff et al [7] and Mayorga et al [8] (carbon), Lange and Hebert [9] and Visser et al [10] (krypton), and Palau et al [11] and Khaska et al [12] (chlorine).…”