
prathyeka pravartthanam

oru radionuclydinte oru yoonit pindatthinte pravarthanamaanu nirddishta pravartthanam, athu aaa radionuclydinte bhauthika savisheshathayaanu.
pravartthanam ennathu radio aaktivittiyumaayi bandhapetta oru alavaanu (sii yoonit beckerell aanu), oru prathyeka radio nucleidil sambhavikkunna secondil radio active parivartthanangalude ennamaayi nirvachikkappedunnu. secondil oru radio active kshayamaayi nirvachikkappedunna beckerell (bii. kyu) aanu pravartthanatthinte yoonit. secondil radio active shayamaaya curie (sii. aii) aanu pravartthanatthinte pazhaya, sii. aii. ithara yoonit. pravartthanatthinte mattoru yoonit ratherfordaanu, ithu secondil radio active kshayamaayi nirvachikkappedunnu.
oru nischitha samaya edavelaykkullil oru nischitha radionuclydinte radio active shayathinulla saadhyatha nischithamaayathinaal (chila cheria ozhivaakkalukalode, kshaya nirakk maarunnath kaanuka), oru nischitha samayat sambhavikkunna kshayangalude ennavum (athinaal oru nischitha ennam attangal) aaa radionuclydinte oru nischitha samkhyayaanu (sthithivivarakkanakku ettakkurachilukal avaganichu).
athinaal, oru prathyeka radionuclydinte oru yoonit pindatthinte pravarthanamaayaanu nirddishta pravartthanatthe nirvachikkunnath. ithu saadhaaranayaayi bii. kyu/kilogram yoonittukalilaan nalkunnathu, ennaal saadhaaranayaayi upayogikkunna mattoru yoonit curie (sii. aii) aanu, ithu nirddishta pravarthanatthinu yoonit sii. aii/jii nalkaan anuvadikkunnu. nirddishta pravartthanatthinte alavu ionizing vikiranavumaayi sanbarkkam pulartthunna nilavaravumaayi thettidharikkaruthu, angane exposure allengil agiranam cheytha alavu. manushyaril ionizing vikiranathinte phalangal vilayiruthunnathil pradhaanamaaya alavaanu agiranam cheytha alavu.
roopeekaranam.
λ" umm t1/2 umm thammilulla bandham.
kshaya sthiraankamaaya "λ" ulla oru prathyeka radionuclydinte kshaya nirakkum aattangalude ennavum "n" aayi radio aaktivitti prakadippikkunnu
integral parihaarathe exponential decay vivarikkunnu
ivide "t" = 0 enna samayathulla aattangalude prarambha alavaanu "n" 0.
oru nischitha alavilulla radio active aattangalude pakuthiyum radio active shayathinu vidheyamaakunnathinulla samayadairkhyamaanu ardhaayuss t1/2 ennu nirvachichirikkunnathu.
iruvashathumulla swaabhaavika logaritham edukkumbol, ardhaayuss nalkunnathu
neremarichu, kshayam sthiraamkam "λ" ardhaayuss "t" 1/2 ll ninnu uruthirinjekkaam
prathyeka pravartthanatthinte kanakkukoottal.
radionuclydinte pindam nalkunnathu
ivide "m" ennathu radionuclydinte mollar pindove "n" a ennathu avagadro sthiraankavumaanu. praayogikamaayi, radionuclydinte pindasankhya "a" g/mol ll prakadippikkunna mollar pindatthinte oru sathamaanathinte oru bhinnasamkhyaykkullil ullathinaal ithu oru ekadesha kanakkayi upayogikkaam.
radionuclydinte yoonit pindatthil radio aaktivitti ennaanu nirddishta radio aaktivitti "eiii" nirvachichirikkunnathu
athinaal, nirddishta radio activityum vivarikkaam
eee samavaakyam lalithamaakkunnath
ardhaayussinte yoonit secondukalkku pakaram varshangalilaayirikkumbol
udaaharanathina aarr. eiii.-226-nte prathyeka pravartthanam.
udaaharanathinu, 1600 varshathe ardhaayussulla radium-226-nte nirddishta radio aaktivitti ingane labikkum
radium-226 ll ninnu uruthirinja eee moolyathe curie (sii. aii) ennariyappedunna radio aaktivittiyude unitaayi nirvachichu.
nirddishta pravartthanatthil ninnulla ardhaayuss kanakkaakkuka.
oru radionuclydinte ardhaayuss kanakkakkaan pareekshanaathmakamaayi alakkunna nirddishta pravartthanam upayogikkaam.
ivide kshaya sthiraankamaaya "λ" nirddishta radio aaktivitti "a" maayi inipparayunna samavaakyathiloode bandhappettirikkunnu
athinaal, ardhaayuss vivarikkaanum kazhiyum
udaaharanathina arby-87nte ardhaayuss.
oru gram rubedium-87 umm radio aaktivitti kaundu nirakkum, soolid angle efakttukal kanakkiledutha sesham, secondil 3200 kshayangalude kshaya nirakkumayi poruthappedunnu. rubedium aattomik maas 87 gram/moll aanu, athinaal oru gram oru molinte 1/87 aanu. nambarukal plug inn cheyyuka
aaplikkeshanukal.
mattu niravadhi biomedical aaplikkeshanukalkkoppam, chikitsa farmaceuticals, athupole thanne rogaprathirodha parisodhanakal allengil mattu diagnostic nadapadikramangal, allengil chila parithasthithikalile radio aaktivitti vilayiruthal ennivaykkaayi avaa thiranjedukkumbol radionuclydeukalude prathyeka pravartthanam prathyekichum prasakthamaanu.

