About Us

MINEVIK Machinery is a leading and pioneering enterprise with the most advanced international level in R&D, manufacturing and selling of large-scale crushing & screening plants and beneficiation plants.

large-scale crushing & screening plants and beneficiation plants.

All of our equipment have got ISO international quality system certification, European Union CE certification and Russian GOST certification.

  • In central China-Zhengzhou, covering 140 thousand square meters
  • Win-win cooperation and create more value to customers
  • Exported large quantities and high-end mobile crushing plant and milling equipments to Russia, Kazakhstan, Indonesia, Ecuador, South Africa, Nigeria, Turkey more than 100 countries .

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Our Products

AS a leading global manufacturer of crushing and milling equipment, we offer including quarry, aggregate, grinding production and complete stone crushing plant. We also supply individual crushers and mills as well as spare parts of them.

Services

Our goal is to guarantee the excellent operation equipment with high safety for our customers and minimize the downtime of the machine by predictive maintenance. Kefid service and original accessories can be 100% trusted at the time of maintenance.

SERVICE AND SUPPORT

Minevik service and original accessories can be 100% trusted at the time of maintenance.

ACCESSORIES CENTER

striving to enable customers to get the parts in the nearest place.

SALES MARKET

Our sales market is spread all over more than 100 countries and regions

Strontium Isotopes Using

Isotopes of strontium Wikipedia

In addition to the four stable isotopes, thirty-one unstable isotopes of strontium are known to exist (see Table, below): the longest-lived of these are 90 Sr with a half-life of 28.9 years and 85 Sr with a half-life of 64.853 days. Of importance are strontium-89 (89 Sr) with a half-life of 50.57 days, and strontium-90 (90 Sr).

Strontium Wikipedia

Isotopes. Natural strontium is a mixture of four stable isotopes: 84 Sr, 86 Sr, 87 Sr, and 88 Sr. Their abundance increases with increasing mass number and the heaviest, 88 Sr, makes up about 82.6% of all natural strontium, though the abundance varies due to the production of radiogenic 87 Sr as the daughter of long-lived beta-decaying 87 Rb.

Strontium Isotopes | SpringerLink

18/07/2018· Strontium (Sr) isotopes are widely applied tracers in geoscientific applications. One of the four stable isotopes (87 Sr) is subject to long-term radiogenic ingrowth by radioactive decay of rubidium (87 Rb).Resultant isotope variations in 87 Sr/ 86 Sr, but also other stable isotope variations, can be employed to trace mixing of global reservoirs, ranging from high-temperature-pressure

Strontium-90 Wikipedia

Strontium-90 (90 Sr) is a radioactive isotope of strontium produced by nuclear fission, with a half-life of 28.8 years. It undergoes β − decay into yttrium-90, with a decay energy of 0.546 MeV. Strontium-90 has applications in medicine and industry and is an isotope of concern in fallout from nuclear weapons and nuclear accidents.

USGS -- Isotope Tracers -- Resources

Periodic Table--Strontium. The alkali earth metal strontium has four stable, naturally occurring isotopes: 84 Sr (0.56%), 86 Sr (9.86%), 81 Sr (7.0%) and 88 Sr (82.58%). Only 87 Sr is radiogenic; it is produced by decay from the radioactive alkali metal 87 Rb, which has a half-life of 48,800,000 years. Thus, there are two sources of 87 Sr in any material: that formed during primordial nucleo

Strontium Element information, properties and uses

The nuclear reactor accident at Chernobyl in 1986 also threw strontium-90 into the air. Nowadays, it's used as a radioactive tracer in cancer therapy. Still strontium's close relation to calcium has made it a modern treatment for treating osteoporosis as the salt strontium ranelate, using non-radioactive isotopes, of course. Because strontium

Rubidium–strontium dating Wikipedia

The rubidium-strontium dating method is a radiometric dating technique used by scientists to determine the age of rocks and minerals from the quantities they contain of specific isotopes of rubidium (87 Rb) and strontium (87 Sr, 86 Sr).. Development of this process was aided by German chemists Otto Hahn and Fritz Strassmann, who later went on to discover nuclear fission in December 1938.

Tracking animals using strontium isotopes in teeth: the

Using strontium isotope measurements on the teeth of fallow deer found at Fishbourne, the authors argue that these elegant creatures were first introduced into Britain as a gift to the Romanised aristocracy. Kept and bred in a special enclosure at the palace, they provided more than a status symbol and gastronomic treat: the fallow deer was an

Strontium-89 Wikipedia

Strontium-89 (89 Sr) is a radioactive isotope of strontium produced by nuclear fission, with a half-life of 50.57 days. It undergoes β − decay into yttrium-89.Strontium-89 has an application in medicine.

Strontium Isotope Analysis « Center for Applied Isotope

Strontium isotopic ratios are widely used as tracers in geological processes and as indicators of provenance in an archaeological context. A significant fraction of the Earth’s 87 Sr is not primordial, but is produced by the decay of 87 Rb. Geochemically, Strontium follows Calcium, while Rubidium follows Potassium; thus, the geological variability of Sr isotope ratios in rocks is a function

Using strontium isotopes to evaluate the spatial variation

Strontium, a trace element with geochemical behavior similar to Ca, has a naturally radiogenic isotope, 87 Sr, produced by the decay of 87 Rb (half-life = 4.92 × 10 10 yrs). This results in variation in the 87 Sr/ 88 Sr ratio of Sr that depends on the geochemical and geologic histories of

Ancient DNA, Strontium isotopes, and osteological

25/11/2008· The typical precision for 87 Sr/ 88 Sr achieved for a tooth sample using this method is ± 0.00001. Sr isotope results for the teeth from Eulau are provided in Table S3. Molars were sampled in all cases. For the adults, the Sr isotopes represent the weighted average of dietary strontium from around 2.5 to 7.5 years for M2 and 9 to 14 years for M3.

Strontium Isotopes | SpringerLink

30/12/2016· Strontium (Sr) isotopes are widely applied tracers in geoscientific applications. One of the four stable isotopes (87 Sr) is subject to long-term radiogenic ingrowth by radioactive decay of rubidium (87 Rb).Resultant isotope variations in 87 Sr/ 86 Sr, but also other stable isotope variations, can be employed to trace mixing of global reservoirs, ranging from high-temperature-pressure

Strontium Isotopes | SpringerLink

The half-life of 87 Rb, which decays to 87 Sr, is such that considerable variations exist in the present-day 87 Sr/ 86 Sr ratio in minerals. Finally, Sr isotopes are not measurably fractionated by geological processes, unlike the isotopes of the light elements. All these characteristics potentially make Sr a good tracer of the source rock(s) of

Strontium Wikipedia

Isotopes. Natural strontium is a mixture of four stable isotopes: 84 Sr, 86 Sr, 87 Sr, and 88 Sr. Their abundance increases with increasing mass number and the heaviest, 88 Sr, makes up about 82.6% of all natural strontium, though the abundance varies due to the production of radiogenic 87 Sr as the daughter of long-lived beta-decaying 87 Rb.

Using Strontium Isotopes to Determine the Age and

The marine/meteoric mixing of ancient salinas can be modeled by using strontium concentrations and isotope ratios estimated from modern analogs. A limited comparison of strontium and sulfur isotopes shows that sulfur isotopes in the settings studied are less sensitive to meteoric influx.

Strontium isotopes: applications

reconstruction of migratory behavior using strontium isotopes. Geology. •Using 87 Sr/ 86 Sr ratios to look at migrations of two large extinct proboscideans •Compared values from teeth to the values for different regions of the southeast US •Results have interesting implications for theories about the life histories and cause of

The use of natural strontium isotopes as tracers in

This paper discusses the potential of using the natural 87 Sr/ 86 Sr ratio as a tracer for environmental studies. The results presented point to an ongoing impoverishment of the environment and show that the temporal trend in Sr isotope composition for different media is

(PDF) Using Strontium Isotopes to Study Site

PDF | Strontium isotopes (87Sr/86Sr) in tooth enamel reflect the geological substrate on which an animal lived during tooth development. Therefore, strontium isotopes of teeth in fossil cave

Mapping the origin of faunal assemblages using strontium

Here we show that it is possible to use strontium (Sr) isotopes from bones and vegetation to statistically constrain the area sampled in two Holocene predator accumulations in northeastern Yellowstone National Park, Wyoming. Previous studies have used these sites to elucidate local population responses to climatic change, by assuming that the

Strontium isotopes | SpringerLink

The use of strontium isotopes to study human mobility was first proposed by Jonathon Ericson , who noted the geographic variation in the stable isotopes of 87 Sr/ 86 Sr and the fact that this ratio is maintained essentially unchanged in the human skeleton from its value in the local environment with no apparent changes imposed by metabolism

Strontium-90 Half-Life, Properties, Beta-Decay, Uses

Natural Strontium (Sr) does not have radioactive properties, but its isotope 90 Sr has high radioactive properties and undergoes Beta (β – ray) decay. Its decay energy is 0.546 MeV and is distributed among an anti-neutrino, an electron and the 90 Y (Yttrium-90) isotope. Strontium-90 Beta Decay Equation. The Beta decay equation of 90 Sr is

Strontium Isotope an overview | ScienceDirect Topics

Strontium-isotope ratios are not particularly diagnostic of source terrain ages because Rb/Sr ratios are easily disturbed. However, Sm/Nd ratios tend to be conservative and neodymium-isotope ratios are effective tracers of the mean crustal age of sediment sources.

Cretaceous strontium isotope stratigraphy using marine barite

Strontium isotope data for Site 305 and Site 766 barite and carbonate samples are given in 1Table 1 and plotted in Figure 2, along with the LOWESS composite Sr isotope curve for the Cretaceous of McArthur et al. (2001). The LOWESS curve was compiled by using Sr isotope data from 11 literature sources for the Cretaceous section after

Spectrochimica Acta Part B Berkeley Lab

The analyses of natural and enriched strontium isotopes using LAMIS are reported in this manuscript. The results demonstrate sen-sitivity to 86Sr, 87Sr, and 88Sr with spectrally resolved measurements for each of these isotopes. Diatomic oxide and halides of strontium were used in this study to represent the application of LAMIS for isotope-specific analysis of solid samples in ambient

Chapter 35 Applications of Sr Isotopes in Archaeology

and applications of radiogenic strontium isotope anal-ysis in archaeology, beginning with a general discus-sion of the properties of strontium isotopes. Strontium (Sr) is a trace element that is found in most igneous, metamorphic, and sedimentary rock, as well as in river water, groundwater, seawater, soil,

Strontium isotope analysis on cremated human remains

Strontium-87 is the product of the radioactive decay of rubidium-87 (87 Rb), so strontium isotope ratios (87 Sr/ 86 Sr) vary between different types of bedrock, depending on the initial 87 Sr/ 86

Sciency Thoughts: Using strontium isotope analysis to

5/08/2018· Using strontium isotope analysis to identify the origins of cremated human remains from Stonehenge. Stonehenge is an internationally renowned Neolithic monument located on Salisbury Plain in Wiltshire, southern England, thought to have been constructed between 4000 and 5000 years ago.. The monument comprises a ring of standing stones, each of which is about 4 m high and 2.1 m wide,

Strontium (Sr) Isotope Supplier: Stable Isotopes and

Strontium titanate is a gemstone. The radioactive isotope Strontium-90, with a half-life of 29 years, is a product of nuclear fission and a high-energy beta emitter. This isotope is a lightweight nuclear-electric power source in space vehicles and remote weather stations.

Strontium isotope maps are disturbed by agricultural lime

13/03/2019· Thus, many studies using strontium isotopes for provenance and mobility studies in these farmed low-calcareous areas may well need revision, and researchers should use care when sampling in

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