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Topic: Strontium unit

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	Strontium unit - Wikipedia, the free encyclopedia
		The strontium unit is a unit used to measure the amount of radioactivity from strontium-90, a chemical found in nuclear fallout, in a subject's body; as the human body mistakes the substance for calcium and incorporates 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 United States National Academy of Sciences holds that the maximum safe measure of strontium-90 in a person is one hundred strontium units (3700 Bq/kg).
	en.wikipedia.org /wiki/Strontium_unit (164 words)

	Strontium - Wikipedia, the free encyclopedia
		Strontium is a chemical element in the periodic table that has the symbol Sr and the atomic number 38.
		Strontium is a bright silvery metal that is softer than calcium and even more reactive in water, which strontium decomposes on contact to produce strontium hydroxide and hydrogen gas.
		Strontium itself was discovered in 1798 and metallic strontium was first isolated by Sir Humphry Davy in 1808 using electrolysis.
	en.wikipedia.org /wiki/Strontium (1169 words)

	Strontium Information Center - strontium 90
		Strontium is a chemical element strontium dihydrogen phosphate in the periodic table that has the symbol Sr and the atomic number 38.
		Strontium atomic emission spectrum of strontium is a bright silvery metal that is softer than calcium and barium strontium titanate + thermal even strontium symbol more reactive in water; strontium will decompose on contact to produce strontium hydroxide and hydrogen gas.
		The strontium unit is used in measuring radioactivity from absorbed strontium-90.
	www.scipeeps.com /Sci-Chemistry_Topics_S/Strontium.html (1246 words)

	Units: S
		These are units of flow rate for gases, and the term "standard" indicates that the flow rate assumes a standard temperature and a standard pressure of 1 atmosphere.
		This unit was originally called the bit [2], because when the message is a bit string and all strings are equally likely, then the information content turns out to equal the number of bits.
		One strontium unit is a concentration of 1 picocurie per gram of calcium (pCi/g Ca).
	www.unc.edu /~rowlett/units/dictS.html (10538 words)

	World Vegetarian Congress 1963 - radiation, food and health
		The strontium is similar in behaviour to calcium but as far as is known it is not an essential element.
		It is usual to express strontium content in terms of the "strontium unit" (S.U.) which is the amount of strontium-90 per gram of calcium.
		Strontium contamination from the soil may be reduced by liming, and by the use of green manure and dung; the surface use of compost appears to be of some value as the roots of plants tend to go deeper where the strontium only penetrates very slowly.
	www.ivu.org /congress/wvc63/radiation.html (3583 words)

	Geothermal Aquifer in the Alvord Basin, Harney County, Oregon
		Strontium isotopic ratios for thermal waters indicate that the thermal aquifer does not reside in the welded ash-flow tuffs of the Trout Creek Mountains, the rhyolites in the vicinity of Fields, or the Mickey ignimbrite.
		The oldest units are metamorphic rocks exposed in the lower slopes of the Pueblo Mountains west of Tumtum Lake in the southern Pueblo Valley.
		Strontium isotopic ratios and Rb/Sr ratios of thermal waters at Borax Lake and spring north of Borax Lake are consistent with an aquifer host of the upper rhyolite flows of the Pike Creek Formation or rhyolites of similar isotopic composition.
	nwdata.geol.pdx.edu /OR-Geothermal/BLM1F.htm (7505 words)

	ATSDR - Public Health Statement: Strontium
		Strontium is found naturally in soil in amounts that vary over a wide range, but the typical concentration is 0.2 milligrams per kilogram (kg) of soil (or 0.2 mg/kg).
		The concentration of strontium in leafy vegetables, such as cabbage, grown in the United States is less than 64 mg in a kg of the fresh vegetables (i.e., 64 ppm).
		These emissions, which differ for the various isotopes of strontium, are used to tell the amount of radioactive strontium (in curies or bequerels) and the radiation dose that it gives to your body (in sieverts or rem).
	www.atsdr.cdc.gov /toxprofiles/phs159.html (4077 words)

	Strontium - Search Results - MSN Encarta
		Strontium, symbol Sr, chemically reactive, malleable, ductile metallic element.
		In group 2 (or IIa) of the periodic table (Periodic Law), strontium...
		Radiostrontium is similar to calcium in its chemical behavior, including its deposition in human bone.
	ca.encarta.msn.com /Strontium.html (81 words)

	Institute for Social Ecology - Our Synthetic Environment CHAPTER SIX: RADIATION AND HUMAN HEALTH
		The MPC for strontium-go is measured in strontium units (S.U.), formerly called "sunshine units." A single S.U. is one micromicrocurie (,u,uc) of strontium-go per gram of calcium (a uuc is equal to one millionth of a millionth of a curie; a curie essentially represents the amount of radioactivity associated with one gram of radium).
		But if one couples Dr. Engstrom's estimate of IOO strontium units as the maximum permissible level for radiation workers with the International Commission's suggestion that the permissible level for a population should be one thirtieth the occupational level, it would appear that the population limit should be only three strontium units.
		A long-term average of only one strontium unit in the bones of every individual in the world may well cause 12,500 cases of bone cancer; as little as two strontium units may result in 25,000 cases.
	www.social-ecology.org /article.php?story=20031118094248566 (9255 words)

	Substitution of Strontium, Beryllium, and Magnesium into the Matrix of Hydroxyapatite: A Computer Modeling Study
		The unit cell of bone, hydroxyapatite, is composed of PO OH, and Ca (figure 1).
		Because strontium is much larger than calcium it might seem logical that its incorporation into the matrix could cause a bulge that would lead to a looser fit of the strontium-containing cell with surrounding hydroxyapatite cells.
		The results of this study suggest that, although strontium would most likely not cause damage to a fully strontium-saturated hydroxyapatite matrix, it has the potential to cause resonance-related damage to a hydroxyapatite matrix when both calcium and strontium are present.
	www.whitworth.edu /Academic/Department/Chemistry/Classes/ch494/tonyb/research.htm (4491 words)

	Crossflow Filtration and Rheology of a Strontium Carbonate/Manganese Oxide Slurry
		Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights.
		The unit was designed to process a small sample of radioactive material (inventory of less than 1 liter) at plant-typical pressures and crossflow velocity.
		The purpose of the precipitations are to reduce activity of strontium-90 and transuranics in the liquid phase of the slurry but further discussion of the chemistry is beyond the scope of this paper.
	sti.srs.gov /fulltext/ms2001134/ms2001134.html (3362 words)

	Volume 9, Issue 1, page 8 \| The Compleat Aberree
		Eighty percent of the strontium 90 in vegetables and grains is deposited
		are roughly in the 10 strontium unit range.
		unit value of 5, which is quite low.
	www.aberree.com /v09/n01p08.html (732 words)

	SOFIA - Open File Report - OFR 98-205
		The oldest unit encountered in the study cores is an unnamed formation that is late Miocene.
		The hydrologic confining units penetrated by these cores are different in different parts of the study area.
		Thick zones of poorly sorted muddy unconsolidated sands form a slight confining unit in other cores; these probably are not correlative to either the sandstone or the dolostones to the west.
	sofia.usgs.gov /publications/ofr/98-205 (625 words)

	Operable Unit III Record of Decision
		These three water-bearing units are designated as a "sole-source aquifer" by the U.S. Environmental Protection Agency (EPA) and serve as the primary source of drinking-water for Nassau and Suffolk Counties.
		The Operable Unit III Remedial Investigation Report (IT, 1999a) includes an evaluation of the nature and extent of contamination, and the human-health and ecological risks associated with the contamination from thirteen AOCs in OU III, and groundwater contamination from four AOCs in OU II/VII.
		Non-carcinogenic effect risks due to Operable Unit III contaminants were estimated by dividing the intake of a chemical by the acceptable intake over the period of exposure.
	www.bnl.gov /erd/Groundwater/ou3/ou3rod.html (18613 words)

	Fact Sheet: Operable Unit I Proposed Plan
		Operable Unit I was defined as a 950-acre area in the southeastern part of the site.
		The Feasibility Study for Operable Unit I describes the cleanup alternatives that were evaluated in detail for these areas.
		The principal soil contaminants in Operable Unit I are radioactive elements, primarily cesium-137 and strontium-90.
	www.bnl.gov /erd/Surface/ou1PP/ou1pp-facts.html (2317 words)

	Fallout and Reproduction of Ocean Fish Populations - E.J. Sternglass, Department of Radiology, School of Medicine, ...
		Since the waters near the continental shelves in which herring and related fish such as the sardine, the salmon and the trout deposit their eggs reflect closely the radioactivity in the surface air (l2), the measured concentrations of Sr-90 and Cs-137 in the northern hemisphere have also been listed in Table II.
		As a further check on the present hypothesis, the changes in the fishing catches by United States vessels in various parts of the Pacific Ocean were examined before and after the onset of nuclear tests in that area.
		Finally, it is important to note that the percent changes in fetal and infant mortality in man for the period of heavy Nevada testing (1951-1962) show closely the same effect per unit Strontium-90 in the milk of the Northern Hemisphere as the percent changes in fish populations as measured by the Norwegian catch.
	www.mindfully.org /Nucs/Fallout-Fish-Sternglass8oct71.htm (1802 words)

	Strontium DRI/RDA, negative health/side effects, toxicity/toxic overdose, nutritional requirements
		The action of strontium is closely related to that of calcium
		strontium has to be ingested daily (versus a few mg/day obtained through regular food intake), and
		Estimated median daily intake of strontium worldwide from food and water is 1mg - 5mg per day.
	www.acu-cell.com /sr.html (641 words)

	Interactive Periodic Table (Site not responding. Last check: 2007-10-31)
		Volatile strontium salts impart an excellent crimson colour to flames, and these salts are used in pyrotechnics.
		Strontium titanate is an interesting optical material as it has an extremely high refractive index and an optical dispersion greater than that of diamond.
		However, Klaproth and Hope discovered strontium itself in 1798 and metallic strontium was first isolated by Sir Humphry Davy in 1808 using electrolysis.
	mendeleev-table.com /sr.html (317 words)

	[S] TERMS & DEFINITIONS IN NUCLEAR CHEMISTRY
		STRONTIUM UNIT A measure of the concentration of 90Sr in food and in the body measured relative to calcium.
		One strontium unit is 1 millibecquerel 90Sr per gram calcium.
		SUB- and SUPEREQUIVALENCE ISOTOPE DILUTION A technique of substoichiometric radiochemical analysis in which two series of solutions containing sample and spike are compared; one is isotopically diluted with increasing amounts of carrier and the other has multiples of sample and spike but no carrier.
	www.radiochemistry.org /nomenclature/s.htm (2347 words)

	[No title] (Site not responding. Last check: 2007-10-31)
		] Two or more components combined into a unit for convenience in assembling or servicing equipment; an intermediate-frequency strip for a receiver is an example.
		] A structural unit, which, though manufactured separately, was designed for incorporation with other parts in the final assembly of a finished product.
		] An occurrence of strata beneath the subsurface of an inclusive stratigraphic unit that succeeds an unconformity on which there is marked overstep.
	www.accessscience.com /Dictionary/S/S60/DictS60.html (2252 words)

	USGS -- Isotope Tracers -- Resources
		Third, a difference in the relative "effective" surface areas of minerals in one portion of the rock unit will also cause differences in chemistry and isotopic composition; "poisoning" of reactive surfaces by organic coatings is an example of this kind of process.
		Therefore, 20% of Sr in biomass is derived from the bedrock and 80% from atmospherically-transported dust (Graustein, 1989).
		Further information can be found in the section: Strontium Isotopes in Geologic Processes in Clark and Fritz (1997), Environmental Isotopes in Hydrology (CRC Press).
	wwwrcamnl.wr.usgs.gov /isoig/period/sr_iig.html (1147 words)

	WONDERMAGNET.COM - NdFeB Magnets, Magnet Wire, Books, Weird Science, Needful Things
		It is odd to note that the large unit has an arrow indicating the proper flow direction, while the small one has no arrow, and it's instructions state that the direction of flow does not matter.
		MAGNETS--The reason our homemade unit provides such a strong magnetic field in the center of the pipe is because we used Neodymium-Iron-Boron magnets, the strongest known to man. The expensive commercial units used Strontium-Ferrite, which is not as strong magnetically.
		For fuel treatment, the commercial units advise using the same minimum distance, and also warn against getting the unit too close to your vehicle's engine sensors, which could malfunction from the intense magnetic field.
	www.wondermagnet.com /magwatertreat.html (1759 words)

	Martha J. McNeely, Case No. VFA-0265, February 25, 1997
		The Appellant cites a number of studies that she believes she may have been involved in as a child in Hanford, Washington, and thus her involvement in these studies would have created medical records.
		The Appellant also asserts that she may have participated in "Project Gabriel," a study she asserts involved the uptake and retention of strontium and cesium in humans.
		In addition, the official had knowledge of only one study using strontium at Hanford and that the study involved two male researchers as subjects.
	www.oha.doe.gov /cases/foia/vfa0265.htm (1292 words)

	Freeman-Lynde GEOL3350 Chapter 2 Questions
		The geologic period is the fundamental _______________ unit.
		Lithostratigraphic units are not the same age everywhere they occur.
		A formation (the fundamental lithostratigraphic unit) is always the same age everywhere it occurs.
	www.arches.uga.edu /~rfreeman/GEOL3350_Chap_2_quest.html (7570 words)

	Reagents - Strontium Chloride
		Strontium Chloride, Crystal, Reagent, 100g - Single Unit
		Strontium Chloride, Crystal, Reagent, 100g - 12 Pack
		Strontium Chloride, Crystal, Reagent, 500g - Single Unit
	www.chemassociates.com /shopsite/Chemassoc2/PAS-strontiumchloride.html (32 words)

	[No title]
		Why is the strontium nitrate found in roadside emergency flares represented as Sr(NO3)2 rather than SrN2O6?
		Explain what is wrong with each of the following chemical formulas: a.
		How many atoms of each element are contained in a single formula unit of iron (III) formate, Fe(CHO2)3.H2O, a compound used as a preservative in fodder?
	www.unit5.org /christjs/4Bonding.doc (279 words)

	Reagents - Strontium Nitrate
		Strontium Nitrate, Granular, Lab, 100g - Single Unit
		Strontium Nitrate, Granular, Reagent, 125g - Single Unit
		Strontium Nitrate, Granular, Reagent, 500g - Single Unit
	www.chemassociates.com /shopsite/Chemassoc2/PAS-strontiumnitrate.html (152 words)

	Chemistry : Periodic Table : strontium : compound data [strontium (II) chloride]
		For each compound, and where possible, a formal oxidation number for each element is given, but the usefulness of this number is limited, especially so for p-block elements in particular.
		unit with the most intense ion set to 100%.
		The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.
	www.webelements.com /webelements/compounds/text/Sr/Cl2Sr1-10476854.html (310 words)

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