Spectrometry = Spectro-metry =measurement of spectrum...
Transcript of Spectrometry = Spectro-metry =measurement of spectrum...
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Spectrometry
• Spectrometry
= Spectro-metry
=measurement of spectrum
=measurement of intensity vs energy
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0 - Training materials:
http://nsspi.tamu.edu/nssep/courses/basic-radiation-detection/gamma-ray-spectroscopy/introduction/introduction
Pages 31-47
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Especially: page 36http://nsspi.tamu.edu/nssep/courses/basic-radiation-detection/gamma-ray-spectroscopy/gamma-ray-spectra/gamma-ray-spectra-page-two
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Especially: page 38http://nsspi.tamu.edu/nssep/courses/basic-radiation-detection/gamma-ray-spectroscopy/gamma-ray-spectra/gamma-ray-spectra-page-four
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1 – Decay chainshttp://periodictable.com/Isotopes/086.222/
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2 – table of isotopes (browser)http://nucleardata.nuclear.lu.se/toi/nucSearch.asp http://nucleardata.nuclear.lu.se/toi/radSearch.asp
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2 – browser
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2 – browser
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2 – browserENERGY= X-axis
INTENSITY= Y-axis
(be careful: do we have
efficiency calibration?
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3 – example Th-232
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Real samples– mix of differentisotopes
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γ-emittingdoughter isotopes of Th-232
Real samples– mix of differentisotopes
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γ-emittingdoughter isotopes of Th-232
Real samples– mix of differentisotopes
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4 – our isotopes
http://www.spectrumtechniques.com/products/sources/disk-sources-and-source-sets/
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5 – our software
http://tukan.ncbj.gov.pl/files/UsersGuide_Tukan8k_2.3.pdf
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5 – our software
http://tukan.ncbj.gov.pl/files/UsersGuide_Tukan8k_2.3.pdf
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5 – our software
http://tukan.ncbj.gov.pl/files/UsersGuide_Tukan8k_2.3.pdf
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5 – our software
http://tukan.ncbj.gov.pl/files/UsersGuide_Tukan8k_2.3.pdf
Page 156:
16.3 MCA - Multichannel Analyzer mode
Principle of operation is as follows: input analog signal (pulse) is stretched, converted to digital value
proportional to its height and norm alized to a num berof channels and m axim um pulse height value, which is
10V; such a value defines the address of a unique channel in histogram m em ory, which is
increm ented by one.
Parameters:
ADC Successive approxim ation type (16 bits) with sliding scale averaging.
Max resolution 8k; 8192 channels, software selectable as 8192, 4096, 2048 and 1024 blocks.
Dead time per event < 5 μs (including m em ory transferi).
Integral non linearity <= ±0.05% over the top 99% dynam ic range.
Differential non linearity < ±1% over the top 99% dynam ic range.
Gain instability <= ±1% ppm/degC.
Histogram memory 8k channels (volatile): 2^24- 1 counts per each channel (almost 17 millions counts)