41Ca: Measurement by accelerator mass spectrometry and applications

Fink, David; Middleton, R.; Klein, J.; Sharma, Pankaj

doi:10.1016/0168-583x(90)90049-z

Cited by 79 publications

(32 citation statements)

References 25 publications

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“…Near the geomagnetic poles, however, the shielding of the cosmic rays by the magnetic field of the Earth is less effective, and higher ratios are expected. Thus the actual 41 Ca/Ca ratio found in the lithosphere depends on the geographic area (28,29). Through erosion processes, 41 Ca is distributed into different compartments of the global ecosystem and finally enters the food chain.…”

Section: Methodsmentioning

confidence: 99%

“…The application of the Munich MP tandem accelerator to detect 41 Ca produced by A-bomb neutrons has already been demonstrated in an earlier study [a general description of 41 Ca-AMS is given elsewhere (28,47,48)]. In this study, a 41 Ca profile was measured in a granite gravestone exposed to neutrons from the bomb at close distances from the hypocenter in Hiroshima (49,50).…”

Section: Advantage Of Ams For Studies On Neutron Exposure From A-bombmentioning

confidence: 99%

“…Therefore, it was decided to convert the enamel material to calcium hydride (CaH 2 ) as described previously (34). From this material, high currents of negative CaH 3 2 can be extracted from the ion source and the corresponding KH 3 molecules do not form negative ions (35,28). Despite the complicated procedures required for sample preparation, this method was adopted because of its effectiveness in suppressing the isobar signal already in the ion source.…”

Section: Ams Sample Preparationmentioning

confidence: 99%

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Mapping the Distribution of ⁹⁰Sr in Teeth with a Photostimulable Phosphor Imaging Detector

Romanyukha¹,

Mitch²,

Lin³

et al. 2002

Radiation Research

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Section: Methodsmentioning

confidence: 99%

Section: Advantage Of Ams For Studies On Neutron Exposure From A-bombmentioning

confidence: 99%

Section: Ams Sample Preparationmentioning

confidence: 99%

See 1 more Smart Citation

Mapping the Distribution of ⁹⁰Sr in Teeth with a Photostimulable Phosphor Imaging Detector

Romanyukha¹,

Mitch²,

Lin³

et al. 2002

Radiation Research

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“…The AMS measurements were made at the University of Pennsylvania. The methods used for the above radionuclides have been presented by Fink et al (1990), Middleton and Klein (l986), and Middleton and Klein (1987). The results on the radionuclide activities are given in Table 5.…”

Section: Radionuclide Activitiesmentioning

confidence: 99%

Mineralogical and chemical composition and cosmic‐ray exposure history of two mesosiderites and two iron meteorites

Terribilini

Eugster

Mittlefehldt

et al. 2000

Meteorit & Planetary Scien

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Abstract-We performed a comprehensive study of the noble gas isotopic abundances, radionuclide activities, and mineralogical and chemical composition of two mesosiderites and two iron meteorites. For the mesosiderites Dong Ujimqin Qi and Weiyuan, the silicate and the metal phases were studied. The anomalous ataxite Rafriiti is not chemically related to any other meteorite class, whereas Ningbo is a type IVA octahedrite. The mineralogy and major and trace element abundances of the silicate phases of Dong Ujimqin Qi and Weiyuan are similar to those of other mesosiderites and distinct from those of the howardites. The cosmic-ray exposure history was studied based on the concentrations of the cosmogenic noble gas nuclei and radionuclide activities. For the iron meteorites, cosmic-ray exposure ages were calculated from the pairs 10Be-21Ne1 26A1-21Ne, and 36C1-36Ar. Ramti yields the youngest exposure age of all ataxites (6.8 ? 1.7 Ma), whereas that of Ningbo with 107 2 15 Ma falls within the range observed for the other octahedrites. The parent body break-up times of the mesosiderites Dong Ujimqin Qi and Weiyuan are 252 ? 50 and 25.9 ? 5.0 Ma, respectively. We find no evidence for a common break-up event for the mesosiderites and the howardites.

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“…However, the preparation of hydride from sample material is arduous and involves the reduction of CaO to Ca metal, followed by conversion to the hydride, requiring technology not common to biochemistry laboratories. Also, once prepared the very hygroscopic hydride has to be kept dry (Fink et al 1990). Thus, CaF 2 is now being used as an alternative to the hydride.…”

Section: Ca As a Tracer For Calcium Metabolismmentioning

confidence: 99%

Use of accelerator mass spectrometry for studies in nutrition

2001

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Accelerator mass spectrometry (AMS) is an ultrasensitive analytical technique for measuring rare nuclides such as 14 C, 26 Al and 41 Ca. The low detection limit and wide dynamic range of AMS allow long-term and highly sensitive tracer studies in nutrition that cannot be performed with other methods. The present paper is intended to provide a description of AMS to the interested nutritionist and present proven applications. AMS is compared to liquid scintillation counting and stable isotope MS. A description of common AMS methodology is presented that consists of determining the dose, preparing the sample, diluting the sample (if necessary), and measuring the sample. Applications include Ca metabolism, Al uptake from the environment, dietary intake of carcinogens, fat metabolism and folate metabolism. Throughout this discussion the experimental advantages (small doses that pose no health risk, extremely long experimental lifetime, small sample sizes and high sensitivity) made possible by the unique analytical capabilities of AMS are emphasized. The future of AMS is discussed. As the number of AMS centres, instruments, and studies increases, the number of nutritional applications that employ AMS will continue to grow. The coupling of AMS with other analytical techniques (e.g. high performance liquid chromatography) will be developed as access to AMS improves.Accelerator mass spectrometry: Stable isotopes: Micronutrient metabolism: Fat metabolism: Carcinogens: Radioisotope

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41Ca: Measurement by accelerator mass spectrometry and applications

Cited by 79 publications

References 25 publications

Mapping the Distribution of ⁹⁰Sr in Teeth with a Photostimulable Phosphor Imaging Detector

Mapping the Distribution of ⁹⁰Sr in Teeth with a Photostimulable Phosphor Imaging Detector

Mineralogical and chemical composition and cosmic‐ray exposure history of two mesosiderites and two iron meteorites

Use of accelerator mass spectrometry for studies in nutrition

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41Ca: Measurement by accelerator mass spectrometry and applications

Cited by 79 publications

References 25 publications

Mapping the Distribution of 90Sr in Teeth with a Photostimulable Phosphor Imaging Detector

Mapping the Distribution of 90Sr in Teeth with a Photostimulable Phosphor Imaging Detector

Mineralogical and chemical composition and cosmic‐ray exposure history of two mesosiderites and two iron meteorites

Use of accelerator mass spectrometry for studies in nutrition

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Mapping the Distribution of ⁹⁰Sr in Teeth with a Photostimulable Phosphor Imaging Detector

Mapping the Distribution of ⁹⁰Sr in Teeth with a Photostimulable Phosphor Imaging Detector