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1. WordNet® 3.0 (2006) |
radioactivity
n 1: the spontaneous emission of a stream of particles or
electromagnetic rays in nuclear decay [syn: radiation,
radioactivity]
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2. The Collaborative International Dictionary of English v.0.48 |
radioactivity \ra`di*o*ac*tiv"i*ty\
(r[=a]`d[i^]*[-o]*[a^]k*t[i^]v"[i^]*t[y^]), n. (Physics)
a form of instability which is a property of the atomic
nuclei of certain isotopes, which causes a spontaneous change
in the structure of the nucleus, accompanied by emission of
energetic radiation. The radiation emitted is usually
sufficient to cause ionization in matter through which it
passes, and is therefore called ionizing radiation. The
radiation emitted by most radioactive substances is one of
three types: alpha rays, beta rays, or gamma rays. Some
chemical elements have no stable isotopes, and these are
referred to as radioactive elements, and the element itself
is said to possess radioactivity.
Note: The changes in radioactive nuclei which cause radiation
in most cases cause the chemical identity of the
nucleus itself to change, as when tritium (an isotope
of hydrogen) emits a beta ray and converts to helium.
The radioactive decay process is a first-order
reaction, and the rate of decay of a particular isotope
can therefore be expressed as the half life of the
isotope, which is the time it takes for one half of the
remaining undecayed isotope to decay, and is a constant
independent of the proportion of original material
which has already decayed. The half life of tritium,
for example, is 12.3 years.
[PJC]
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Thesaurus Results for radioactivity:
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1. Moby Thesaurus II by Grady Ward, 1.0 |
activity, artificial radioactivity, contamination, curiage, decontamination, fallout, half-life, natural radioactivity, nuclear radiation, radiant energy, radiation, radioactive radiation, radiocarbon dating, radiolucency, radiopacity, radiosensibility, radiosensitivity, saturation point, specific activity |
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Common Misspellings > |
radioactivity aradioactivity ardioactivity rardioactivity adioactivity rradioactivity rdaioactivity radaioactivity rdioactivity raadioactivity raidoactivity radidoactivity raioactivity raddioactivity radoiactivity radioiactivity radoactivity radiioactivity radiaoctivity radioaoctivity radiactivity radiooactivity radiocativity radioacativity radioctivity radioaactivity radioatcivity radioactcivity radioativity radioacctivity radioacitvity radioactitvity radioacivity radioacttivity radioactviity radioactiviity radioactvity radioactiivity radioactiivty radioactivivty radioactiity radioactivvity radioactivtiy radioactivitiy radioactivty radioactiviity radioactiviyt radioactivityt radioactiviy radioactivitty radioactiviyty radioactivit radioactivityy 4adioactivity r4adioactivity 4radioactivity $adioactivity r$adioactivity $radioactivity 5adioactivity r5adioactivity 5radioactivity eadioactivity readioactivity eradioactivity tadioactivity rtadioactivity tradioactivity dadioactivity rdadioactivity dradioactivity fadioactivity rfadioactivity fradioactivity gadioactivity rgadioactivity gradioactivity rqdioactivity raqdioactivity rqadioactivity rwdioactivity rawdioactivity rwadioactivity rsdioactivity rasdioactivity rsadioactivity rxdioactivity raxdioactivity rxadioactivity rzdioactivity razdioactivity rzadioactivity r dioactivity ra dioactivity r adioactivity redioactivity ridioactivity rodioactivity rudioactivity rawioactivity radwioactivity rawdioactivity raeioactivity radeioactivity raedioactivity rarioactivity radrioactivity rardioactivity rasioactivity radsioactivity rasdioactivity rafioactivity radfioactivity rafdioactivity raxioactivity radxioactivity raxdioactivity racioactivity radcioactivity racdioactivity ravioactivity radvioactivity ravdioactivity ra ioactivity rad ioactivity ra dioactivity rad8oactivity radi8oactivity rad8ioactivity rad*oactivity radi*oactivity rad*ioactivity rad9oactivity radi9oactivity rad9ioactivity raduoactivity radiuoactivity raduioactivity radooactivity radiooactivity radoioactivity radjoactivity radijoactivity radjioactivity radkoactivity radikoactivity radkioactivity radloactivity radiloactivity radlioactivity radaoactivity radeoactivity radi9activity radio9activity radi9oactivity radi(activity radio(activity radi(oactivity radi0activity radio0activity radi0oactivity radiiactivity radioiactivity radiioactivity radipactivity radiopactivity radipoactivity radikactivity radiokactivity radikoactivity radilactivity radiolactivity radiloactivity radiaactivity radieactivity radiuactivity radioqctivity radioaqctivity radioqactivity radiowctivity radioawctivity radiowactivity radiosctivity radioasctivity radiosactivity radioxctivity radioaxctivity radioxactivity radiozctivity radioazctivity radiozactivity radio ctivity radioa ctivity radio activity radioectivity radioictivity radiooctivity radiouctivity radioastivity radioacstivity radioasctivity radioadtivity radioacdtivity radioadctivity radioaftivity radioacftivity radioafctivity radioaxtivity radioacxtivity radioaxctivity radioavtivity radioacvtivity radioavctivity radioa tivity radioac tivity radioa ctivity radioac5ivity radioact5ivity radioac5tivity radioac%ivity radioact%ivity radioac%tivity radioac6ivity radioact6ivity radioac6tivity radioacrivity radioactrivity radioacrtivity radioacyivity radioactyivity radioacytivity radioacfivity radioactfivity radioacftivity radioacgivity radioactgivity radioacgtivity radioachivity radioacthivity radioachtivity radioact8vity radioacti8vity radioact8ivity radioact*vity radioacti*vity radioact*ivity radioact9vity radioacti9vity radioact9ivity radioactuvity radioactiuvity radioactuivity radioactovity radioactiovity radioactoivity radioactjvity radioactijvity radioactjivity radioactkvity radioactikvity radioactkivity radioactlvity radioactilvity radioactlivity radioactavity radioactevity radioactidity radioactivdity radioactidvity radioactifity radioactivfity radioactifvity radioactigity radioactivgity radioactigvity radioacticity radioactivcity radioacticvity radioactibity radioactivbity radioactibvity radioacti ity radioactiv ity radioacti vity radioactiv8ty radioactivi8ty radioactiv8ity radioactiv*ty radioactivi*ty radioactiv*ity radioactiv9ty radioactivi9ty radioactiv9ity radioactivuty radioactiviuty radioactivuity radioactivoty radioactivioty radioactivoity radioactivjty radioactivijty radioactivjity radioactivkty radioactivikty radioactivkity radioactivlty radioactivilty radioactivlity radioactivaty radioactivety radioactivi5y radioactivit5y radioactivi5ty radioactivi%y radioactivit%y radioactivi%ty radioactivi6y radioactivit6y radioactivi6ty radioactiviry radioactivitry radioactivirty radioactiviyy radioactivityy radioactiviyty radioactivify radioactivitfy radioactivifty radioactivigy radioactivitgy radioactivigty radioactivihy radioactivithy radioactivihty radioactivit6 radioactivity6 radioactivit6y radioactivit^ radioactivity^ radioactivit^y radioactivit7 radioactivity7 radioactivit7y radioactivitt radioactivityt radioactivitty radioactivitu radioactivityu radioactivituy radioactivitg radioactivityg radioactivitgy radioactivith radioactivityh radioactivithy radioactivitj radioactivityj radioactivitjy Definition commonly spelled as: Defanition or Defenition, Synonym as: Synonim, Sinonym or Sinonim, Thesaurus as: Thesorus or Thesauris, Dictionary as: Dictionery or Dictionry and Define is usually not misspelled. What does mispell meen? It Meens...
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