The strontium unit is a unit used to measure the amount of radioactivity from strontium-90, a radionuclide found in nuclear fallout, in a subject's body ; as the human body absorbs strontium as if it were calcium, incorporating it into the skeleton, its presence is very common.

One strontium unit is equal to one picocurie from strontium-90 per gram of calcium ( 37 becquerels per kilogram ) in the subject's skeleton.

The strontium unit was formerly known briefly as the sunshine unit, a term promoted by the United States Department of Defense until public ridicule brought about its disuse.

Its melting temperature of 1000 K ( 727 ° C, 1341 ° F ) is intermediate between those of the lighter strontium ( 1050 K ) and heavier radium ( 973 K ); however, its boiling point of 2170 K ( 1897 ° C, 3447 ° F ) exceeds that of strontium ( 1655 K ).

The density ( 3. 62 g · cm < sup >− 3 </ sup >) is again intermediate between those of strontium ( 2. 36 g · cm < sup >− 3 </ sup >) and radium (~ 5 g · cm < sup >− 3 </ sup >).

Barium is chemically similar to magnesium, calcium, and strontium, being even more reactive.

There is also some evidence that strontium ranelate is effective in decreasing the risk of vertebral and non vertebral fractures in postmenopausal osteoporotic women.

An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically.

While natural strontium is stable, the synthetic < sup > 90 </ sup > Sr isotope is present in radioactive fallout and has a half-life of 28. 90 years.

Strontium is a grey, silvery metal that is softer than calcium and even more reactive in water, with which it reacts on contact to produce strontium hydroxide and hydrogen gas.

It is kept under a liquid hydrocarbon such as mineral oil or kerosene to prevent oxidation ; freshly exposed strontium metal rapidly turns a yellowish color with the formation of the oxide.

Finely powdered strontium metal is pyrophoric meaning it will ignite spontaneously in air at room temperature.

Natural strontium is a mixture of four stable isotopes.

Terbium is used to dope calcium fluoride, calcium tungstate and strontium molybdate, materials that are used in solid-state devices, and as a crystal stabilizer of fuel cells which operate at elevated temperatures.

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 (< sup > 87 </ sup > Rb ) and strontium (< sup > 87 </ sup > Sr, < sup > 86 </ sup > Sr.

Although unbinilium is expected to behave typically for an alkaline earth metal, showing a strong + 2 oxidation state, the energetic properties of its valence electrons would increase its ionization energies ; hence, unbinilium may have a lower metallic and ionic radius than expected, and may behave more similarly to calcium and strontium than barium or radium.

The remaining 93 % is kinetic energy ( or energy of motion ) of the charged fission fragments, flying away from each other mutually repelled by the positive charge of their protons ( 38 for strontium, 54 for xenon ).

Typically made of a mixture of barium, strontium and calcium oxides, the coating is Sputtering | sputtered away through normal use, often eventually resulting in lamp failure.

The chemistry is based upon the interaction of caesium and strontium with poly ethylene oxide ( poly ethylene glycol ) and a cobalt carborane anion ( known as chlorinated cobalt dicarbollide ).

For example, when platinum wire is dipped into a strontium nitrate solution and then inserted into a flame, the strontium atoms emit a red color.

The phosphor typically used for a near 368 to 371 nanometre emission peak is either europium-doped strontium fluoroborate (:) or europium-doped strontium borate (:) while the phosphor used to produce a peak around 350 to 353 nanometres is lead-doped barium silicate (:).

Volatile strontium salts impart a bright red color to flames, and these salts are used in pyrotechnics and in the production of flares.

Until recently, only certain compounds of copper and oxygen ( so-called " cuprates ") were believed to have HTS properties, and the term high-temperature superconductor was used interchangeably with cuprate superconductor for compounds such as bismuth strontium calcium copper oxide ( BSCCO ) and yttrium barium copper oxide ( YBCO ).

For example, sodium salts placed in the flame will glow yellow from sodium ions, while strontium ( used in road flares ) ions color it red.

Celestine, the major strontium mineral, was first dug in the late 1880s and was initially used for the refining of sugar beet.

Common pigments used in phosphorescent materials include zinc sulfide and strontium aluminate.

Prior to World War I the beet sugar industry used 100, 000 to 150, 000 tons of strontium hydroxide for this process per year.

Downstream of T2 is a 500 MeV facility used to produce strontium isotopes for medical-imaging generators as well as the Thermal Neutron Facility ( TNF ).

; Beamline 2C ( BL2C ): used for the Proton Therapy Program to treat choroidal melanomas ( eye tumours ) and proton irradiation to produce strontium isotopes, which are chemically processed and then used for medical imaging generators.

* Lanthanum strontium manganite, a crystal used as a cathode material

Commonly used / tested electrodes materials are nickel / zirconia cermet ( Ni / YSZ ) and lanthanum-substituted strontium titanate / ceria composite for SORFC cathode, and lanthanum strontium manganite ( LSM ) for SORFC anode.

Other metal nitrates have been used, including Barium and strontium nitrates.

They used X-ray fluorescence to look for trace elements such as lead and strontium in bones from a recently excavated naval cemetery

One currently investigated option for the process used yttria-stabilized zirconia ( YSZ ) electrolytes, nickel-cermet steam / hydrogen electrodes, and mixed oxide of lanthanum, strontium and cobalt oxygen electrodes.

Through analysis of various strontium isotopes, archaeologists have realized that much of the timber that composes Chacoan construction came from a number of distant mountain ranges, indicative also of the Chaco Road's economic significance.

Toxic ions, such as strontium (), cobalt ( II ) (), and lead ( II ) () are transported into the vacuole to isolate them from the rest of the cell.

These include some that do not superconduct at high temperatures, such as the strontium ruthenate oxide compounds, but that, like the high-temperature superconductors, are unconventional in other ways ( for example, the origin of the attractive force leading to the formation of Cooper pairs may be different from the one postulated in BCS theory ).

The International Atomic Energy Agency ( IAEA ) later stated that it contained approximately of strontium, equivalent to the amount of radiation released immediately after the Chernobyl accident ( though the total radiation release from Chernobyl was 2500 times greater at around ).

Red color can be obtained from strontium sulfide.

The excitation wavelengths for strontium aluminate range from 200 to 450 nm.

Colors with longer wavelengths can be obtained from the strontium aluminate as well, though for the price of some loss of brightness.

Lichens are also utilized for survey of long life nuclides ( a distinct kind of atom or nucleus characterized by a specific number of protons and neutrons ) like strontium ( 90 < sub > Sr </ sub >) and cesium ( 137 < sub > Cs </ sub >) released from nuclear explosions.

In the hills to the north of Strontian lead was mined in the 18th century and in these mines the mineral strontianite was discovered, from which the element strontium was first isolated.

The first large scale application of strontium was in the production of sugar from sugar beet.

The LPT type has an excess of elements from the crust such as potassium and strontium.

* In the massively multiplayer online game Eve Online, strontium clathrates, mined from ice asteroids, have various strategic applications.

Toxic constituents depend upon the specific coal bed makeup, but may include one or more of the following elements or substances in quantities from trace amounts to several percent: arsenic, beryllium, boron, cadmium, chromium, chromium VI, cobalt, lead, manganese, mercury, molybdenum, selenium, strontium, thallium, and vanadium, along with dioxins and PAH compounds.

Electrorefining may be able to separate heavy metals such as plutonium, caesium, and strontium from the less-toxic bulk of uranium.

However, modern strontium isotope analysis of the human remains recovered from the tomb attributed to him indicate that K ' inich Yax K ' uk ' Mo ' spent his formative years much closer to Copán, at Tikal, and had not himself lived at Teotihuacan.

A 2011 study using ratios of strontium isotopes in teeth suggested that Australopithecus africanus and P. robustus groups in southern Africa were patrilocal: females tended to settle farther from their region of birth than males did.

It is made from phosphors such as silver-activated zinc sulfide or, more recently, doped strontium aluminate, and typically glows a pale green to greenish blue color.