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Topic: Gray (unit)


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In the News (Sat 11 Oct 08)

  
  gray - Search Results - MSN Encarta
Gray (radiation), international unit of measure of absorbed radiation dose.
The gray (symbol: Gy) is the SI unit of absorbed dose.
Definition One gray is the absorption of one joule of radiation energy by one kilogram of matter.
encarta.msn.com /encnet/refpages/search.aspx?q=gray   (263 words)

  
  Gray (unit) - Wikipedia, the free encyclopedia
The gray (symbol: Gy) is the SI unit of absorbed dose.
One gray is the absorption of one joule of radiation energy by one kilogram of matter.
The gray was defined in 1975 in honor of Louis Harold Gray (1905-1965), who used a similar concept, “that amount of neutron radiation which produces an increment of energy in unit volume of tissue equal to the increment of energy produced in unit volume of water by one röntgen of radiation,” in 1940.
en.wikipedia.org /wiki/Gray_(unit)   (400 words)

  
 [No title]
Gray was one of the Yankees who "pillaged" a house, pulling out furniture and breaking it up on the sidewalk.
Gray said some guys took note of how hard it was to break the chairs' frames and will keep that in mind the next time they're in the market for furniture.
Gray's unit is able to keep that to a minimum by reenacting a prewar militia unit.
www.bedfordbulletin.com /articles/2006/03/29/news/news01.txt   (849 words)

  
 Louis Harold Gray   (Site not responding. Last check: 2007-09-19)
In a 1940 paper, Gray and Read employed their energy unit, "that amount of neutron radiation which produces an increment of energy in unit volume of tissue equal to the increment of energy produced in unit volume of water by one röntgen of radiation".
The unit became known as a centre for radiation chemistry, and studies were carried on the irradiation of bacteria, and of tumours.
Gray was Vice Chairman of the International Commission on Radiation Units and Measurements (ICRU) from 1956 to 1962, and assisted in the formation of the IARR.
www.medphysics.ucla.edu /more_gray.htm   (378 words)

  
 Gray - Search Results - MSN Encarta
Gray, SI unit of absorbed dose of radiation.
Gray, Thomas (1716-1771), English poet, born in London and educated at Eton College and the University of Cambridge.
Gray, Robert (1755-1806), American explorer and sea captain, born in Tiverton, Rhode Island.
uk.encarta.msn.com /Gray.html   (169 words)

  
 [No title]   (Site not responding. Last check: 2007-09-19)
Unit forms ridge composed of Battle Ridge and Grassy Mountain and weathers to gravel-strewn slopes; contact with Hoppers Formation is abrupt and is placed at base of lowest cobble conglomerate; gradational upper contact with unit Tfu; unit thins to northeast; about 304 m thick in quadrangle; 228 m measured in sec.
Unit is chiefly volcaniclastic mudstone and siltstone that are gray and green in lower 213 m and grayish red above; calcareous, containing common carbonaceous material and common yellowish-brown- weathering calcareous concretions; locally rich in magnetite and zeolites.
Tuffs thicken to northwest (Skipp and Peterson, 1965; Skipp and Hepp, 1968).
pubs.usgs.gov /imap/i-2634/sedanmeta.txt   (6999 words)

  
 Diary of William Fairfax Gray, Virginia to Texas, 1835-1837 (wg_r014.htm)
Gray engaged in a variety of activities suitable to a man of his social and professional standing.
In 1819 Gray received a promotion to the rank of major, and the next year Governor Thomas M. Randolph commissioned him a lieutenant colonel, giving him the rank that served as a common prefix to his name for the rest of his life.
Gray was an officer in that organization for the next eight years and in December 1831 became district deputy grand master.
www.smu.edu /SWcenter/FairfaxGray/wg_r014.htm   (505 words)

  
 SA unit leads in Aids research - SouthAfrica.info
The trendy offices of the Perinatal HIV Research Unit at Chris Hani Baragwanath Hospital in Soweto are a far cry from the poky broom closet its directors James McIntyre and Glenda Gray started out in when they embarked on their mission 10 years ago to find ways of preventing mother-to-child infection of HIV.
Now the unit, which occupies several floors of the hospital's New Nurses Home, a large square building west of the hospital, employs 200 staff members, conducts myriad research programmes and is an international player in the field of HIV/Aids research.
The unit was pivotal in changing the mindset of the World Health Organisation, which prescribed that HIV-positive women in developed countries should formula feed while those in developing countries should breastfeed, in the belief that the health risks for formula feeding in Third World countries outweighed the risk of HIV transmission.
www.southafrica.info /ess_info/sa_glance/health/aids/mcintyre-gray.htm   (840 words)

  
 Vermont Guardsman is 3d in unit to die in Iraq - The Boston Globe
Vermont National Guard Sergeant Jamie Gray of East Montpelier was killed yesterday in Iraq when a roadside bomb exploded south of Baghdad, striking a unit that lost two soldiers two weeks ago.
Gray, 29, was the third Vermont National Guardsman and the 10th serviceman with ties to Vermont to die in Iraq since the war began.
Gray's unit lost two soldiers two weeks ago: Sergeant Kevin Sheehan, 36, of Milton, and Sergeant Alan Bean Jr., 22, of Bridport, were buried last week.
www.boston.com /news/local/vermont/articles/2004/06/08/vermont_guardsman_is_3d_in_unit_to_die_in_iraq   (321 words)

  
 Radiation Risk
It is one of the standard units for radiation dosimitry, but is not applicable to alpha, beta, or other particle emission and does not accurately predict the tissue effects of gamma rays of extremely high energies.
The rad is a unit of absorbed radiation dose in terms of the energy actually deposited in the tissue.
The more recent SI unit is the gray, which is defined as 1joule of deposited energy per kilogram of tissue.
hyperphysics.phy-astr.gsu.edu /hbase/nuclear/radrisk.html   (430 words)

  
 The Daily Press - Ashland, WI   (Site not responding. Last check: 2007-09-19)
Gray, who attended the school as a child, has been called into active duty along with the rest of her Black River Falls National Guard unit.
Gray has tried to be positive about the assignment, jokingly referring to it as "a year long vacation with a lot of sand." Nevertheless, it's hard to be cheerful when she thinks leaving her children Ryan, eight, and Savannah, six, with her parents in Eau Claire.
Gray was appointed to head the mess section about two months ago, so she faces a quick transition.
www.ashland-wi.com /placed/index.php?sect_rank=1&story_id=184629   (1048 words)

  
 LITHOSTRATIGRAPHY   (Site not responding. Last check: 2007-09-19)
The boundary between Unit I and Unit II is drawn where the light carbonate-rich nannofossil clay layers dominate, as shown clearly by an increase in the a* parameter of the spectrophotometer data (Fig.
Units I and II are also distinguished by the frequency of pyrite concretions that are abundant within Unit I and are almost absent from Unit II.
Unit VII is composed of an intensely bioturbated sequence of grayish olive-green nannofossil clay.
www.ga.gov.au /odp/publications/184_IR/chap_09/c9_4.htm   (2770 words)

  
 Essentials of the SI: Base & derived units
Examples of such SI derived units are given in Table 2, where it should be noted that the symbol 1 for quantities of dimension 1 such as mass fraction is generally omitted.
In photometry, the unit name steradian and the unit symbol sr are usually retained in expressions for derived units.
For a graphical illustration of how the 22 derived units with special names and symbols given in Table 3 are related to the seven SI base units, see relationships among SI units.
physics.nist.gov /cuu/Units/units.html   (468 words)

  
 Output circuit for gray scale control, testing apparatus thereof, and method for testing output circuit for gray scale ...
A gray scale control circuit for outputting gray scale signals is separated into the high side and the low side, thereby enabling the output-current characteristics to be controlled to be close to the γ characteristics of a light emitting device.
Herein, in the conventional gray scale control unit 1101a, electrical characteristics of the second MISFET 1102a and the third MISFET 1103a are homogenized mutually, and the gate electrodes thereof are both connected to the gate bias supply line 1115, thereby together constituting the current mirror circuit.
From the D/A converters, currents having magnitudes corresponding gray scale data are supplied to the TFTs and the pixels, thereby enabling a gray scale display with the organic EL panel.
www.freshpatents.com /Output-circuit-for-gray-scale-control-testing-apparatus-thereof-and-method-for-testing-output-circuit-for-gray-scale-control-dt20060810ptan20060176252.php   (1773 words)

  
 Case Studies - PTTC Rockies
At the base of the unit a thin reworked bed with rip up fragments from the underlying substrate marks the transition form shallower water or intertidal environments to deeper water deposition.
From the rubble, this unit is a brown skeletal dolomudstone to dolowackestone with well developed intercrystalline porosity.
As with the overlying unit, the shaley beds are thinly laminated.
www.mines.edu /research/PTTC/casestudies/lecrr/core7d.html   (479 words)

  
 LITHOSTRATIGRAPHY AND PETROLOGY
Unit III (9.3 m thick) comprises an upper Subunit IIIA of brown claystone and organic-rich fl concretions and a lower subunit (IIIB) of sandy silty claystone, yellow sandstone and dark reddish brown clayey conglomerate.
The transition from Units I to II is marked by a change from gray green siliciclastic turbidites to a sequence dominated by uniformly mottled brownish clay.
Unit II is divided into two subunits on the basis of a gradational change in sediments from poorly consolidated to lithified.
www-odp.tamu.edu /publications/149_IR/chap_06/c6_6.htm   (7143 words)

  
 Drug Crazy: Mike Gray
Gray grew up in the small farm town of Darlington, Indiana, and after graduating from Purdue University with an engineering degree in 1958, he worked in New York as an editor for Aviation Age.
Gray went to Harrisburg to cover the TMI story for Rolling Stone magazine and collaborated on The Warning, (W.W. Norton) a definitive account of the accident based on 200 hours of exclusive interviews and 50,000 pages of transcripts from 5 government inquiries.
Gray's second book, Angle of Attack, Harrison Storms and the Race to the Moon, (W.W. Norton) was purchased by Tom Hanks for the TV series, From the Earth to the Moon.
www.drugcrazy.com /mikegray.htm   (685 words)

  
 Colorado River Basin Stratigraphy
Upper slope unit is interbedded red and gray gypsum, sandstone, and siltstone, and yellowish-gray fossiliferous sandy limestone.
Middle cliff unit is gray, thin-bedded, fossiliferous cherty limestone and sandy limestone.
Lower slope unit is (1) yellowish-gray to pale-red gypsifereous siltstone and calcareous sandstone, (2) gray, thin-bedded sandy limestone, and (3) gray to white, thick-bedded gypsum.
3dparks.wr.usgs.gov /coloradoplateau/lexicon/kaibab.htm   (1025 words)

  
 The University of Michigan Health Physics Web Site: Basic Terms
The main advantage of this unit is that it is easy to measure directly, but it is limited because it is only for deposition in air, and only for gamma and x rays.
The gray is a unit used to measure a quantity called absorbed dose.
The unit gray can be used for any of radiation, but it does not describe the biological effects of the different radiations.
www.umich.edu /~radinfo/introduction/terms.htm   (1341 words)

  
 Blue and Gray to March Together
Confederate and Federal Civil War Reenactors representing units that fought each other in Charleston 133 years ago will march together in the December 8, Charleston, SC Christmas Parade behind a joint color guard bearing the separate flags for which they fought.
Plans call for the units to march together, changing their position in the order of march with a maneuver originally used to deliver fresh troops to the battle front during the war.
Also marching with the units will be members of the 1st.
www.awod.com /gallery/probono/cwchas/paradexm.html   (608 words)

  
 Lowrance -- Support -- Sonar FAQ   (Site not responding. Last check: 2007-09-19)
The flashing of 32 degrees is an indication that the unit does not recognize the presence of a temp sensor.
If possible, swap the head unit with a friend that has the same Lowrance unit or the same connectors, or take your head unit to your local dealer, to pinpoint the location of the problem.
Dual-frequency 50/200 kHz units are specifically designed for saltwater angling or tracking downriggers in the Great Lakes due to the capability of reading deeper and wider with the 50 kHz frequency.
www.lowrance.com /support/faq/sonar_faq.asp   (3167 words)

  
 RADIATION SOURCES AND EFFECTS
The gray is the SI unit used for
Units of absorbed dose often used are the rad and gray
The gray unit represents 1 joule of radiation energy put into a kilogram mass.
www.radiation-scott.org /radsource/2-0.htm   (1414 words)

  
 Ionising radiation and health - risk analysis
To allow for this, the dose in grays is multiplied by an effectiveness factor and the new units are called sieverts (abbreviation Sv) and the dose is called the equivalent dose.
Exposure to x-rays is measured in units of radiation absorbed dose (rad).
One gray is equal approximately to the absorbed dose delivered when the energy per unit mass imparted to matter by ionising radiation is 1 joule per kilogram.
www.abelard.org /briefings/ionising-radiation.asp   (3015 words)

  
 Radiation Related Definitions
The unit rad can be used for any type of radiation, but it does not describe the biological effects of the different radiations.
The curie is a unit used to measure a radioactivity.
The unit gray can be used for any type of radiation, but it does not describe the biological effects of the different radiations.
www.physics.isu.edu /radinf/terms.htm   (1227 words)

  
 [No title]
Unit was acquired from the Fraser Paper Company at Madawaska, ME in 12/72; Used as a shop switcher at Derby, ME during its brief stay on the BAR.
This unit is a Copper-Bessemer powered unit that was originally custom made for the New Haven RR and later sold to the BAR.
This unit was repainted into a variation of the as delivered blue and gray scheme and lettered the "American Railfan".
home.comcast.net /~railimages/SLIDE-LIST/BAR.htm   (2231 words)

  
 Gray Has Unfinished Business - Buffalo Bills
Mularkey recognized the success that Jerry Gray's unit had in 2003 so when it came to asking him to stay, the decision was easy.
Gray was hired to be the team's defensive coordinator in 2001 by newly appointed head coach, Gregg Williams.
Gray spoke about Mularkey with high regard and is looking forward to a successful campaign in 2004.
www.buffalobills.com /news/news.jsp?news_id=2607   (641 words)

  
 [No title]   (Site not responding. Last check: 2007-09-19)
The upsetting news came in the form of an order: Gray's unit was tasked with going out to recover a vehicle damaged in a roadside bomb attack.
"They didn't say anything," Gray recalls of the first time one of his battalion's Humvees was attacked - the first time, in the men's service together, that he feared that his brother may have been harmed.
Family members can share their stories, keep up communication with those back home when one is preoccupied, and lean on one another for a kind of comfort only blood can provide.
www.sltrib.com /portlet/article/html/fragments/print_article.jsp?article=3062479   (789 words)

  
 Absorbed dose: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-09-19)
A gray, (symbol: gy), is the si unit of energy for the absorbed dose of radiation....
The sievert (symbol sv) is an si derived unit of equivalent dose or effective dose of radiation, EHandler: no quick summary.
The strontium unit is a unit used to measure the amount of radioactivity from strontium-90, EHandler: no quick summary.
www.absoluteastronomy.com /encyclopedia/a/ab/absorbed_dose.htm   (473 words)

  
 Grey (disambiguation) - Wikipedia, the free encyclopedia
Grey or gray may refer to many different things:
Gray (unit), the SI unit of energy for absorbed dose of radiation
Gray code, an encoding method used to reduce bit change between adjacent values
en.wikipedia.org /wiki/Gray_(disambiguation)   (150 words)

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