Testing Monazite using high resolution scintillators
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Testing Monazite using high resolution scintillators
monazite-(Ce), (Ce, La, Nd, Th)PO4 (the most common member)
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who need LaBr?
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viewtopic.php?f=20&t=12537
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who need LaBr?
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viewtopic.php?f=20&t=12537
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Re: Testing Monazite using high resolution scintillators
Sean
deadtime!!!!
or are you using "FAST" ADC's
deadtime!!!!
or are you using "FAST" ADC's
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Re: Testing Monazite using high resolution scintillators
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sorry
what is your means?
I do not understand ^_^
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Re: Testing Monazite using high resolution scintillators
Sean
The slewing of the spectra for the NaTl seem to be either too much dead time ie MCA not ready for next pulse or a damaged NaTl scintillator
I check sometime next week on the one i use (ortec 2"x2" Natl with a similar spectra
The slewing of the spectra for the NaTl seem to be either too much dead time ie MCA not ready for next pulse or a damaged NaTl scintillator
I check sometime next week on the one i use (ortec 2"x2" Natl with a similar spectra
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Re: Testing Monazite using high resolution scintillators
JohnJohn Futter wrote: ↑Thu Dec 06, 2018 1:04 am Sean
The slewing of the spectra for the NaTl seem to be either too much dead time ie MCA not ready for next pulse or a damaged NaTl scintillator
I check sometime next week on the one i use (ortec 2"x2" Natl with a similar spectra
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NaI's decay time ~250ns
presume dead time~250x5=1250ns
it can get 80,000 pulses every second.
80000cps is very big. so dead time is not a big problem if your MCA is fast enough.
My LaBr decay time about 20~25ns. ^_^
I also can sell it.
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Re: Testing Monazite using high resolution scintillators
80,000 pulaes per sec could incurr 10% deadtime or more with NaTl which will slew spectra and seriously widen FHHW response hiding the rest of the spectra
as for FAST ADC's this is what I use
https://www.fastcomtec.com/?id=409
as for FAST ADC's this is what I use
https://www.fastcomtec.com/?id=409
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Re: Testing Monazite using high resolution scintillators
so you need LaBr.John Futter wrote: ↑Wed Dec 12, 2018 1:46 am 80,000 pulaes per sec could incurr 10% deadtime or more with NaTl which will slew spectra and seriously widen FHHW response hiding the rest of the spectra
as for FAST ADC's this is what I use
https://www.fastcomtec.com/?id=409
LaBr decay time about 20~25ns.
NaI's decay time ~250ns
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and 80000cps is very dangerous for man.
CZT will be better.
- vince_Darmancier
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Re: Testing Monazite using high resolution scintillators
I have used a 3" X 3" standart NaI scintillation probe for almost 10 years with decent resolution...I dont feel the need for a LaBr
calibration with Co60,
Monazite
Uranium ore
Ba133
calibration with Co60,
Monazite
Uranium ore
Ba133
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Re: Testing Monazite using high resolution scintillators
vince_Darmancier wrote: ↑Wed Jan 02, 2019 2:04 pm I have used a 3" X 3" standart NaI scintillation probe for almost 10 years with decent resolution...I dont feel the need for a LaBr
calibration with Co60,
Monazite
Uranium ore
Ba133
LaBr have Higher resolution and P/C than NEW Saint-Gobain NaI Crystals.
Whether this is needed is a comprehensive result. ^_^