An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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radio window
  روزنه‌ی ِ رادیویی   
rowzane-ye râdioyi (#)

Fr.: fenêtre radio   

A range of electromagnetic radiation in the radio frequencies to which the Earth's atmosphere is transparent.

radio; → window.

radio-loud quasar
  کو‌آسار ِ رادیویی ِ خروشان   
kuâsâr-e râdioyi-ye xorušân

Fr.: quasar puissant en radio   

A quasar that has the same characteristics as a → radio-quiet quasar with the addition of having strong radio emissions.

radio; loud, from O.E. hlud "making noise;" cf. M.Du. luut, Du. luid, O.H.G. hlut, Ger. laut "loud;" → quasar.

Kuâsâr, → quasar; râdioyi, adj. of → radio; xorušân "shouting aloud, roaring," from xorušidan "to shout, cry aloud, roar;" Mid.Pers. xrôšitan "to shout."

radio-quiet quasar
  کو‌آسار ِ رادیویی ِ آرام   
kuâsâr-e râdioi-ye ârâm

Fr.: quasar faible en radio   

A type of quasar with weak radio emission. These types of quasars have strong emissions in both the optical and X-ray spectra. Within the optical spectrum, both broad and narrow emission lines are present. Their host is usually an elliptical galaxy, but less commonly, it might be a spiral. → radio-load quasar.

radio; quiet, M.E., from O.Fr. quiete, from L. quies (genitive quietis) "rest, quiet;" → quasar.

Kuâsârquasar; → radio; ârâm "quiet" (Mid.Pers. râm "peace," râmenidan "to give peace, pleasure," râmišn "peace, pleasure;" Av. ram- "to stay, rest;" cf. Skt. ram- "to stop, stand still, rest, become appeased;" Gk. erema "quietly, gently;" Goth. rimis "rest;" Lith. rãmas "rest").

radioactive
  پرتو-ژیرا   
partow-žirâ

Fr.: radioactive   

Possessing, or pertaining to, → radioactivity.

radio + → active.

radioactive dating
  سن‌یابی ِ پرتو-ژیرا   
sen yâbi-ye partow-žirâ

Fr.: datation radioactive   

Determining the age of an object from the → radioactive decay of its constituting material. The technique consists of comparing the → abundance ratio of a → radioactive isotope to its → decay product. This will yield the number of half-lives that have occurred since the sample was formed. More specifically, if an object is made up of 50 % decay product then it has gone through 1 → half-life. 75% decay product equals 2 half-lives, 87.5% decay product equals 3 half-lives, 93.76% decay product equals 4 half-lives, and so on. For example, the decay product of → uranium-238 (238U) is → lead-206 (206Pb). The half-life of 238U is 4.5 billion years. Hence, if the sample has gone through two half-lives, it is 9 billion years old. See also: → radiocarbon dating.

radioactive; → dating.

radioactive decay
  تباهی ِ پرتو-ژیرا   
tabâhi-ye partow-žirâ

Fr.: désintégration radioactive   

Spontaneous emission by a nucleus of photons or particles.

radioactive; → decay.

radioactive isotope
  ایزوتوپ ِ پرتو-ژیرا   
izotop-e partow-žirâ

Fr.: isotope radioactif   

A → nuclide that is radioactive.

radioactive; → isotope.

radioactive nuclide
  هسته‌وار ِ پرتو-ژیرا   
hastevâr-e partowžirâ

Fr.: nucléide radioactif   

A → nuclide that disintegrates by emitting radiation and transforms into another nuclide. Same as → radionuclide.

radioactive; → nuclide.

radioactive waste
  آخال ِ پرتو-ژیرا   
âxâl-e partow-žirâ

Fr.: déchets radioactifs   

The radioactive by-products from the operation of a nuclear reactor or from the reprocessing of depleted nuclear fuel. Also known as nuclear waste.

radioactive; → waste.

radioactivity
  پرتو-ژیرایی، پرتو-ژیرندگی   
partow-žirâyi, partow-žirandegi

Fr.: radioactivité   

The spontaneous disintegration of certain atomic nuclei, which is accompanied by the emission of either α- or β- particles and/or a γ rays.

radio; → activity.

radiocarbon
  پرتو-کربون   
partow-karbon

Fr.: radiocarbone   

A → radioactive → isotope of → carbon, especially → carbon-14.

radio; → carbon

radiocarbon dating
  سن‌یابی ِ پرتو-کربونی   
senn yâbi-ye partow-karboni

Fr.: datation au radiocarbone   

A radioactive dating technique, applied to organic materials, which measures the content of the radioactive isotope of carbon 14C. The radioactive carbon isotopes created by the impact of cosmic rays with the nitrogen atoms of the atmosphere find their way, via carbon dioxide and photosynthesis, into living material. When an organic material dies it ceases to acquire further 14C atoms, and its 14C fraction declines at a fixed exponential rate due to the radioactive decay of 14C. Comparing the remaining 14C fraction of a sample to that expected from atmospheric 14C allows the age of the sample to be estimated.

radiocarbon; → dating.

radioelement
  پرتو-بن‌پار   
partow bonpâr

Fr.: radioélément   

An element, such as uranium, whose isotopes are all radioactive.

radio; → element.

radiography
  پرتونگاری   
partow-negâri (#)

Fr.: radiographie   

The process of producing an image on a sensitive surface by radiation such as X-rays or gamma rays passing through an object.

radio + → -graphy.

radioisotope
  پرتو-ایزوتوپ   
partow-izotop

Fr.: radioisotope   

A synonym for radionuclide.

radio; → isotope.

radiology
  پرتوشناسی   
partowšenâsi (#)

Fr.: radiologie   

The study and use of radiation and radioactive substances for the treatment of diseases.

radio; + → -logy.

radiolysis
  پرتولس   
partowlas

Fr.: radiolyse   

The dissociation of molecules by radiation, for example in a reactor core, when the water used for cooling breaks down into hydrogen and oxygen.

From → radio + -lysis a combining form denoting "breaking down, loosening, decomposition," → analysis.

radiometer
  تابش‌سنج   
tâbeš-sanj (#)

Fr.: radiomètre   

An instrument that measures the intensity of radiant energy.

radio; → -meter.

radiometric dating
  سن‌یابی ِ تابش‌سنجیک، ~ تابش‌سنجی   
senn yâbi-ye tâbeš-sanjik, ~ tâbeš-sanji

Fr.: datation radiométrique   

A dating method that uses measurements of certain radioactive isotopes to calculate the ages in years (absolute age) of rocks and minerals.

radiometer; → dating.

radiometry
  تابش‌سنجی   
tâbeš- sanji (#)

Fr.: radiométrie   

The detection and measurement of radiant energy, either as separate wavelengths or integrated over a broad wavelength band, and the interaction of radiation with matter in such ways as absorption, reflection, and emission.

radio + → -metry.

Tâbeš-sanji, from tâbeš, →radiation, + -sanj-metry.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc coh col col col Com com com com com com com com Com con con con con con con con con con con con con coo Cor Cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg ura uti val var vec Vel ver Ver vie Vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>