He graduated from Grinnell College with a degree in chemistry. There, he met his future wife, Lorna Laurie McCleary. For graduate school, they both attended the University of Iowa , where he was awarded an M. Both were then sent to work on the Manhattan Project , first at the University of Chicago and then at Oak Ridge, Tennessee , where he encountered mass spectrometry. After a postdoctoral year at Chicago, Patterson moved with Brown to the Division of Geology later the Division of Geological and Planetary Sciences at the California Institute of Technology in , as founding members of its geochemistry program. He and Laurie had four children. Zircons are extremely useful for dating since, when they are formed, they possess tiny imperfections of uranium inside them but no lead. Therefore, if any lead is present in the zircon, it must come from the decay of uranium.

“Age Dating” Groundwater in the Salt Lake Valley

In Miscelaneous Views A chlorofluorocarbon CFC is a natural exacerbate that contains just carbon, chlorine, and fluorine, created as an unpredictable subsidiary of methane, ethane, and propane. They are additionally generally known by the Dupont brand name Freon. The most well-known agent is dichlorodifluoromethane R or Freon Numerous Cfcs have been broadly utilized as refrigerants, charges in vaporized applications , and solvents.

Groundwater dating with CFC, CFC and CFC is possible because (1) the atmospheric mixing ratios of these compounds are known and/or have been reconstructed from to the present, (2) the Henry’s law solubilities in water are known, and (3) concentrations in air and young water are relatively high and can be measured.

History[ edit ] Carbon tetrachloride CCl4 was used in fire extinguishers and glass “anti-fire grenades” from the late nineteenth century until around the end of World War II. Experimentation with chloroalkanes for fire suppression on military aircraft began at least as early as the s. Freon is a trade name for a group of CFCs which are used primarily as refrigerants , but also have uses in fire-fighting and as propellants in aerosol cans.

Bromomethane is widely used as a fumigant. Dichloromethane is a versatile industrial solvent. In the late s, Thomas Midgley, Jr. In searching for a new refrigerant, requirements for the compound were: In a demonstration for the American Chemical Society , Midgley flamboyantly demonstrated all these properties by inhaling a breath of the gas and using it to blow out a candle [6] in Nevertheless, after the war they slowly became more common in civil aviation as well.

In the s, fluoroalkanes and bromofluoroalkanes became available and were quickly recognized as being highly effective fire-fighting materials. Much early research with Halon was conducted under the auspices of the US Armed Forces, while Halon was, initially, mainly developed in the UK. By the late s they were standard in many applications where water and dry-powder extinguishers posed a threat of damage to the protected property, including computer rooms, telecommunications switches, laboratories, museums and art collections.

Beginning with warships , in the s, bromofluoroalkanes also progressively came to be associated with rapid knockdown of severe fires in confined spaces with minimal risk to personnel. By the early s, bromofluoroalkanes were in common use on aircraft, ships, and large vehicles as well as in computer facilities and galleries.

Clair Cameron Patterson

Groundwater, Age of Groundwater, Age of The age of groundwater is defined as the time that has elapsed since the water first entered the aquifer. For example, some of the rain that falls on an area percolates trickles down through soil and rock until it reaches the water table. Once this water reaches the water table, it moves though the aquifer. The time it takes to travel to a given location, known as the groundwater age, can vary from days to thousands of years.

Measuring Groundwater Ages in Years Hydrologists employ a variety of techniques to measure groundwater age.

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Numerical simulations of dating young groundwater with multiple atmospheric tracers: Zhanga Show more https: Because the groundwater age dated by a single tracer generally involves high uncertainty and the multiple-tracer approach is assumed to be much more reliable due to cross-validation, the multiple- tracer has recently become the suggested technique. However, the numerical methods used for simulating groundwater ages based on multiple tracers’ concentrations are limited.

In addition, the multiple-tracer method requires many evaluations before applications can be considered reliable. In this study, we use a rigorous modeling approach, which relies on the backward-in-time random walk particle tracking solutions of the adjoint of the forward advection-dispersion equations, to simulate the groundwater ages. In this analysis we build multiple detailed, three-dimensional geostatistical realizations representing complex subsurface heterogeneity. Then we simulate the backward-in-time transport of multiple tracers from the capture monitoring wells to the water table, by considering the advection, mechanical dispersion, molecular diffusion and radiactive decay of tracers represented by high-resolution particles in numerical models.

Then the multiple-tracer approach is evaluated systematically by considering various distributions of groundwater age underlying a single water sample. Results show that the simulated Chlorofluorocarbonbased ages match the measured ones. Results also show that there is apparent discrepancy between ages dated by different tracers. This discrepancy could contribute to the decreased reliability of the multiple-tracer approach or cause misleading results.

Groundwater, Age of

This use has resulted in large atmospheric releases of CFC gases over the last 50 years. Atmospheric CFC concentrations have increased due to higher usage, as well as relatively long atmospheric residence times, ranging between 44 to years. Precise CFC measurements have been conducted beginning in throughout the globe as a part of the Atmospheric Lifetime Experiment, producing an excellent recorded record of global CFC concentrations.

Infiltration of meteoric water into the subsurface carries dissolved CFC gases. When a groundwater sample is obtained and analyzed for the CFC concentration, the concentration in the water is related to the atmospheric CFC concentration at the time the water entered the subsurface, allowing for a recharge age measurement.

地下水年代 groundwater dating. 気泡を生じさせることなく、地下水の採水を行うことが出来ます。.

Hours of Administration 7: It was thought that local taxes could best be collected by a local official, who would be more responsive to the needs of the community that elected him or her. The Tax Collector serves a four year term and is elected at the same time as the President of the United States. The Tax Collector is responsible for the collection of ad valorem taxes and other taxes set at the local level, including those by special levying districts, state agencies, and county commissions.

For the Department of Revenue, the Tax Collector bills and collects real and personal property taxes. The amount of the tax is based on the assessed value of the property and the millage rate, which is set by various taxing authorities. As an agent of the Department of Highway Safety and Motor Vehicles, the Tax Collector issues state motor vehicle licenses and processes applications for titles on automobiles, trucks, mobile homes, and boats.

In most counties, the Tax Collector is a fee office and the office budget is approved by the Department of Revenue. The office operates on the fees imposed for services rendered and any excess monies are remitted to the Board of County Commissioners at the end of September every year. Under Florida law, e-mail addresses are public records. If you do not want your e-mail address released in response to a public-records request, do not send electronic mail to this entity.

Halon General Info

Water Dating Course Drinking Water Security Water age dating is a simple way to test the security of groundwater aquifers, by establishing how long the water has been underground, i. Deeper groundwater sources can overcome the most common problems that arise from microbiological contamination of surface waters, shallow groundwaters and spring water.

Not directly affected by surface or climate influences Abstracted from a bore head that provides satisfactory sanitary protection Age dating yields an average age of the water as most groundwaters are mixtures of water with different ages. The important question is: What is the fraction of the water with age less than one year? When this is the case, it is unlikely that contamination from recent sources of pollution will be a problem.

CFC Dating Method Atmospheric concentrations of chlorofluorocarbons (CFC) have been increasing steadily since about due to human activities. These are chlorinated and fluorinated hydrocarbons that have been used in refrigerants, aerosols, cleaning agents, fire extinguishers, and insulation foams.

The groundwater apparent age in study area is from 26 to From the viewpoint of residence time, the concentration of these ions in springs and groundwater will continue for decades even if the fertilizer application is under control in a reasonable level from now on. J Hydrol 41 3: Hydrogeol J 13 1: Water Resour Res 31 9: Appl Geochem 22 1:


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Groundwater Age Dating and Recharge Assessment. (CFC), , and parameters – key groundwater age indicators. During recharge, water picks up a CFC signature based on the atmospheric concentration of CFCs, and groundwater retains its characteristic CFC concentration.

The ocean’s role in the climate system involves the transport, sequestration , and exchange of heat, fresh water, and carbon dioxide CO 2 between the other components of the system. When waters descend below the ocean surface, they carry with them dissolved atmospheric gases. The time-dependent tracers in the oceans provide information on which waters have been in contact with the atmosphere on various timescales.

They also give information on the ocean circulation and its variability. The timescale information is needed to understand and to assess the ocean’s role in climate change, and its capacity to take up human-derived constituents, such as CO 2 from the atmosphere. Thus, the advantage to using tracers for ocean circulation studies is the added dimension of time: Tracers serve as a “dye” with which to follow the circulation of ocean waters.

Conventional ocean tracers include temperature, salinity, oxygen, and nutrients. Stable isotope tracers, such as oxygen and carbon , do not decay. In contrast, other radioactive tracers do decay.

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The carbon dioxide content of the atmosphere varies over time. Carbon dioxide is both natural and human-made, and has increased by 25 percent in the last years. Human industrial activities, especially since the Industrial Revolution , have increased the CO 2 content of the atmosphere.

Additionally, CFC smuggling is not considered a significant issue, so the perceived penalties for smuggling are low. Thus, using CFCs in concert with SF6 as a tracer resolves the water dating issues due to decreased CFC concentrations.

The Emigration Tunnel is an infiltration tunnel located in Emigration Canyon. Water from the Emigration Tunnel is over 50 years old. Samples from the rest of the mountain springs and tunnels are younger, however, having ages of less than 40 years. Groundwater withdrawn from wells in the northern Salt Lake Valley is typically a mixture of water that is older than 50 years and water that is younger than 50 years old.

By determining the dissolved concentrations of several harmless gasses in the water samples, the age of the water can be determined. Two of the dissolved gas measurements are chlorofluorocarbons CFC and helium These are chlorinated and fluorinated hydrocarbons that have been used in refrigerants, aerosols, cleaning agents, fire extinguishers, and insulation foams.

The greater the concentration of gas in the atmosphere, the greater its dissolved concentration in precipitation. A CFC age is thus obtained by measuring the dissolved concentration of CFC at the discharge point, then comparing it to atmospheric concentrations in the past to determine at what time the water must have recharged. These samples were collected from two adjacent points near the end of the right-hand more southern branch of the tunnel. They were located roughly feet into the tunnel from the entrance shaft.

At each point, the water sampled was discharging into the tunnel from a fault or major fracture. From these samples, it is estimated that this water entered the groundwater system prior to Helium-4 Dating Method Concentrations of helium-4 gas can also be used as an approximate indicator of how long the water has been in the groundwater system.

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