Multi Channel Analyzer MCA Nrog Gamma Spectroscopy NaI (Tl) Ntes: 5 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:29

Nyob zoo, Zoo siab txais tos txhua tus uas xav paub txog yam nyiam ua Gamma Spectroscopy. Hauv kab lus luv luv no kuv tsuas yog xav qhia kuv cov txheej txheem ua haujlwm ntawm kev tsim tsev DIY Gamma Spectroscopy ntes nrog MCA. Nws tsis yog phau ntawv qhia, Kuv tsuas yog qhia cov duab ntawm tus txheej txheem.

Thaum kuv pib qhov haujlwm, Kuv txiav txim siab ua kom lub roj teeb nqa tau lub cuab yeej siv tau zoo nrog txoj kab ncaj thiab FWHM% daws teeb meem tsawg dua 8%. Cov hluav taws xob hloov pauv qhov hluav taws xob siab rau lub raj xa hluav taws xob ntau, nws muaj cov khoom siv hluav taws xob zoo sib xws los ua cov txheej txheem mem tes thiab nws muaj cov tshuab hluav taws xob digital suav suav cov noob thiab tshuaj xyuas lub spectra.

Kauj Ruam 1: Ua NaI (Tl) Ntes

Lub ntsuas ntsuas tsim nrog R9420 Hamamtsu photomultiplier tube thiab 30x40mm NaI (Tl) scintillation siv lead ua. Cov siv lead ua tau pom zoo ua ke rau lub raj yees duab-cathode qhov rai. Lub raj tau npog nrog ob peb txheej ntawm kab xev hluav taws xob txhawm rau tiv thaiv ib qho teeb ci sab nrauv los ntawm kev nkag mus rau hauv daim duab-cathode. Thaum lub teeb gamma tsoo lub siv lead ua nws tsim lub teeb pom kev zoo me me uas xav kom pom los ntawm PMT raj. Qhov kev siv ntawm lub teeb nyem suav nrog cov ntaub ntawv hais txog lub zog ntawm cov duab gamma.

Txhawm rau tsav PMT raj peb xav tau hluav taws xob siab. Kuv tsim qhov me me thiab ruaj khov nce qib 5V txog 1000V hloov pauv. Thaum koj cuam tshuam nrog gamma spectroscopy koj xav tau nruj nruj tswj hwm qhov hluav taws xob zoo nrog kev ntsuas kub zoo thiab lub sijhawm ntev ruaj khov. Cov khoom siv hluav taws xob niaj hnub tso cai los tsim cov qauv no.

Tus neeg tsav tsheb kuj suav nrog kev faib hluav taws xob rau dynodes thiab kev ua haujlwm mem tes ua kom lub suab nrov nrov tau teeb tsa ncaj qha rau ntawm xaim hluav taws xob. Qhov kev cog lus me me no muaj lub suab nrov qis thiab pab kom tsis txhob muaj av hauv av.

Lub thawv ntawv ua nrog txhuas raj ntawm lub tshuab dhos tsev. Kuv tsis yog tus kws tshaj lij CNC, txhua yam ua tiav nrog kev ua haujlwm.

Hauv qab daim npog (tsis pom ntawm daim duab) Kuv tau teeb tsa lub rooj tsav xwm me me ntxiv nrog LiPO roj teeb, them nyiaj thiab taw qhia LED. Lub ntsuas hluav taws xob tuaj yeem ua haujlwm thaum txuas nrog cable. Kev them lub roj teeb tuaj yeem ua tiav nrog tib lub xov tooj thiab ib qho 5V adapter.

Koj tuaj yeem pom qhov ntsuas lub ntsej muag zoo li lub vijtsam los ntawm lub ntsuas. Raws li yog, nws tuaj yeem siv nrog txhua lub khoos phis tawj raws MCA software, piv txwv li PRA, Theremino lossis BecqMonitor2011. Cov software no siv lub laub suab los tshuaj xyuas lub teeb liab.

Tom qab 2 lossis 3 yav tsaus ntuj Kuv tau siv lub ntsuas ntsuas hloov kho kom pom qhov pom siab thiab teeb tsa lub suab nrov nws xaus nrog qhov zoo nkauj zoo nkauj thiab ~ 7.30% FWHM% ntawm 662keV

Rau qhov ntsuas ntsuas kuv tau siv freeware BecqMonitor2011 nrog 24 ntsis suab hloov pauv.

Kauj Ruam 2: Ua Portable MCA

Vim tias kuv tau npaj yuav siv kuv lub ntsuas ntsuas ua lub cuab yeej nqa tau, Kuv tau ua Multi Channel Analyzer uas tuaj yeem ntes lub teeb liab thiab txuag spectra rau uSD lub laub hauv CSV hom.

Kuv siv lub thawv ntawv MHH-95A thiab tsim PCB tsim ntawm kuv li MCA uas haum rau lub thawv ntawv no. MCA muaj 8-ntsis PIC18 microprocessor nrog 10-ntsis ADC 1024 raws.

128x64 zaub qhia tsuas yog ib feem ntawm cov ntaub ntawv ntawm spectra. Tag nrho 1024 lub thoob cov ntaub ntawv tau khaws tseg rau hauv lub laub SD thiab tuaj yeem qhib tom qab los ntawm BecqMonitor2011.

MCA cov khoom siv hluav taws xob siv roj teeb 2xAA. Nws muaj 2 khawm los tswj cov software thiab ib lub pob rau On/Off.

Kauj Ruam 3: Cov txiaj ntsig

Kev teeb tsa tag nrho tuaj yeem tshawb pom lub zog gamma hauv thaj tsam ntawm 20keV-3000keV, muaj qhov zoo sib xws thiab ~ 7.30% FWHM% ntawm 662keV.

Thawj spectra yog 1 teev ntawm Cs-137 log.scale. Koj kuj tuaj yeem pom Ka-40 ntawm 1460keV

Qhov thib ob spectra yog antique radium saib Ra-226 linear scale 30 feeb

Qhov thib peb spectra yog antique radium saib Ra-226 cav. teev 30 feeb

Thib plaub spectra yog thoriated lantern mantle Th-232 cav. teev 30 feeb

Vam tias tsab xov xwm no tuaj yeem coj kev tshoov siab rau koj kev tsim tom ntej!

Kauj Ruam 4: Cov lus xaus thiab tus nqi

Qhov project tsis yog pheej yig. Kuv tsis muaj cov ntsiab lus qhia meej tus nqi rau txhua feem uas kuv siv hauv txoj haujlwm no, tab sis kim tshaj plaws yog:

1. NaI (Tl) siv lead ua. Kuv yuav cov qauv no tshiab txog $ 200. Nws kim feem ntau vim tias nws tau lees paub qhov kev daws teeb meem thiab nws tsim tawm niaj hnub no. Cov khoom qub qub muaj teeb meem hauv kuv qhov kev paub.

2. R9420 Photomultiplier Tube. $ 60 Lub raj PMT uas kuv siv tsis yog qhov tshiab, tab sis nyob hauv qhov xwm txheej zoo los ntawm cov chaw muab kev ntseeg siab.

3. Kev tsim cov ntaub thaiv. Txawm tias kuv ua los ntawm kuv tus kheej nws tau raug nqi thiab xav tau sijhawm ntau. Cov ntaub ntawv hauv qhov me me kuv yuav yog kim, piv txwv li raj, txhuas pas nrig thiab yas tuaj yeem raug nqi koj li $ 100 suav nrog kev xa khoom, koj kuj yuav tsum tau ntxiv cov nqi ua haujlwm ntawm cov cuab yeej, ntxig thiab lwm yam.

4. Electronics prototyping thiab PCB manufacturing. Tus nqi yog siab heev - $$$$, Kuv tsis tuaj yeem suav tag nrho cov teev, hnub thiab hli uas kuv tau siv rau cov ncauj lus no. Kuv ntxiv kuv sim kom zam tus nqi qis ebay-ali cov khoom siv hluav taws xob. MCA microprocessor software tau sau los ntawm kuv thiab. Nws coj rau kuv ntau qhov peev txheej thiab sijhawm, ua tus tsim khoom lag luam tus kheej thiab cov tub ntxhais kawm Kuv xaiv tsis qhia kuv cov ntaub ntawv vim tias nws yuav tsis npog kuv cov nqi tiag, thov txim. Tab sis yog tias koj muaj tswv yim thiab qhib rau kev koom tes, koj tuaj yeem sau kuv tsab ntawv thov rau kev koom tes ua lag luam.

5. Txhua lwm qhov ib puag ncig zoo li cov xov hlau, lub tsho, roj teeb, cov khoom siv, kua nplaum, kab xev thiab lwm yam yog txog $ 100, yam me me ua rau sib txawv ntawm no …

Cov lus xaus: Hauv kuv lub tswv yim txoj haujlwm tau ua tiav zoo. Kuv tuaj yeem tshuaj xyuas zaub mov, nceb, txiv hmab txiv ntoo, nrhiav cov ntxhais radon hauv dej nag, kuaj cov khoom siv pob zeb lossis cov pob zeb hauv av rau cov isotopes uas muaj suab thaj ntau hauv gamma zog 20keV-3000keV. Txawm tias muaj txhua tus nqi siab raws li DIY qhov project, nws tseem pheej yig heev yog tias koj piv nws nrog cov kws tshaj lij kuaj qib gamma spectrometers. Feem ntau thiab txaus ntshai gamma isotopes tuaj yeem tshawb pom tau yooj yim los ntawm lub cuab yeej.