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Surface exposure dating is a collection of geochronological techniques for estimating the length of time that a rock has been exposed at or near Earth's surface. Surface exposure dating is used to date glacial advances and retreats , erosion history, lava flows, meteorite impacts, rock slides, fault scarps , cave development, and other geological events. It is most useful for rocks which have been exposed for between 10 years and 30, years [ citation needed ]. The most common of these dating techniques is Cosmogenic radionuclide dating [ citation needed ]. Earth is constantly bombarded with primary cosmic rays , high energy charged particles - mostly protons and alpha particles. These particles interact with atoms in atmospheric gases, producing a cascade of secondary particles that may in turn interact and reduce their energies in many reactions as they pass through the atmosphere. This cascade includes a small fraction of hadrons, including neutrons.

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That is what one does in science - there is a constant process of weighing up the evidence on all sides of the argument, with a view to improving the working hypothesis Sadly, you misunderstand the points which I and Olwen Williams-Thorpe and her colleagues are making about the Chlorine 36 dates. The dates are meaningless unless you know exactly where the samples have come from and what their exposure histories may be. You say: " That would only be the case if samples were taken from absolutely clean surfaces that have been exposed to cosmic ray bombardment continuously for that period of time - with no overshading, burial by trees, snow or soil or other rocks over that very long history.

Chlorine 36 sampling of unknown bits of rock is useless - but the technique could be useful in the context of a carefully controlled sampling programme, and with other techniques used in support.

The Stonehenge Bluestones

My ambition would be to get somebody like Lionel Jackson to organize such a programme of sampling and dating, with the full cooperation of EH - but that is extremely unlikely Post a Comment. To extract 36 Cl from silicate minerals we follow the method developed by Irene Schimmelpfennig during her PhD workwhich is inspired by the procedure set up by John Stone at the University of Washington Stone et al.

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It consists of spiking the thoroughly leached sample with an either 35 Cl-enriched or 37 Cl-enriched NaCl spike; dissolving the sample; precipitating silver chloride a first time; cleaning the re-dissolved sample from sulfur; precipitating silver chloride a second time.

The measured ratio, which is a mixture of natural and spike ratio, lies between the two values; in this example, it is The value of the measured ratio depends on the natural Cl concentration in the sample: the higher the natural Cl in the sample i.

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Jun 5, Keller, Texas. Hi, I just joined TFP this season and pool is looking great.

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TFP is an awesome resource. Thanks I thought the information below might be helpful for some of the forum participants.

Polychlorinated dibenzo-p-dioxins (PCDDs) of high concentrations in a ball clay deposit from the Mississippi Embayment were found to be consistent with a natural abiotic and non-pyrogenic origin by investigation with bulk radiocarbon analysis, compound-specific chlorine isotope analysis (CSIA-?37Cl) of octachlorodibenzo-p-dioxin (OCDD), and black carbon (BC) analysis. The Cited by: Chlorine In situ cosmogenic 36 Cl is produced by interaction of cosmic rays with different target elements, mainly calcium, potassium and chlorine (35 Cl). 36 Cl can chemically be extracted from any kind of rock or mineral that contains at least one of these target elements, such as limestone, Ca-/K-feldspar or Ca-pyroxene. Surface exposure dating is a collection of geochronological techniques for estimating the length of time that a rock has been exposed at or near Earth's surface. Surface exposure dating is used to date glacial advances and retreats, erosion history, lava flows, meteorite impacts, rock slides, fault scarps, cave development, and other geological events.

It had a date code. I now am very careful to check the date code before I purchase.

Chlorine has two stable isotopes and one cosmogenic isotope. The cosmogenic isotope, 36 Cl, has a long half-life, making it useful in age dating groundwaters up to 1 million years old. There is also limited variation in 37 Cl. Most natural variation in 37 Cl values in hydrologic systems are related to diffusion processes. May 25,   Easy way to measure strength of bleach/liquid chlorine. A 10, to 1 dilution of chlorine will result in chlorine ppm equal to its strength (percent). All you need to do is to make the 10, to 1 dilution, then measure the ppm using a FAS-DPD test kit. Example: If the dilution measures ppm, then your bleach strength is %. Chlorine, with its long half-life (, a), is a good candidate to obtain information about residence time of C.I. groundwater. Some 36 Cl measurements were performed for groundwater dating in the Great Oriental Erg as early as (Fontes et al., , Guendouz, , Michelot et al., a). Complementary sampling was realized in Cited by:

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Chlorine dating

Check this link scroll down to see the half-life table half-life means half of the original strength. Note that decomposition occurs faster for higher strength chlorine and faster at higher storage temperatures.

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A 10, to 1 dilution of chlorine will result in chlorine ppm equal to its strength percent. Example: If the dilution measures 8.

fluorine dating

Step 1: Measure 1 liter of Deionized or Distilled water. Step 2: Measure 0. This is easy to do by using a 0.

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Hope this is helpful to some. Last edited: Aug 5, Jun 22, East TN.

Nov 25,   Chlorine dating and the bluestones of Stonehenge by Olwen Williams-Thorpe, D. Graham Jenkins, Judith Jenkins, John S. Watson Chlorine dating has important potential for archaeology, but recent Chlorine dates on 'bluestones' of . Fluorine dating definition, a method of determining the relative age of fossil bones found in the same excavation by comparing their fluorine content. See more. CHLORINE DATING OF OLD GROUNDWA TER Fred M. Phillips New Mexico Institute of Mining & Technology Socorro, NM, USA Basic Principles of 36Cl Chlorine has been widely used for dating old groundw Size: 1MB.

Thats some interesting information. Instead of going through all that trouble, why not measure your FC level then put 3ppm chlorine in the pool and wait a little bit, then check to see how much your FC has risen. This would be a little more accurate when the sun goes down of course and wouldnt work if you have algae or other problems.

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You're right. I could do it that way too.

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  1. Gosar

    I do not understand something

  2. Fenritilar

    It agree, it is an excellent idea

  3. Tozuru

    You not the expert?


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