Upload
others
View
10
Download
0
Embed Size (px)
Citation preview
Spectrometry
• Spectrometry
= Spectro-metry
=measurement of spectrum
=measurement of intensity vs energy
0 - Training materials:
http://nsspi.tamu.edu/nssep/courses/basic-radiation-detection/gamma-ray-spectroscopy/introduction/introduction
Pages 31-47
Especially: page 36http://nsspi.tamu.edu/nssep/courses/basic-radiation-detection/gamma-ray-spectroscopy/gamma-ray-spectra/gamma-ray-spectra-page-two
Especially: page 38http://nsspi.tamu.edu/nssep/courses/basic-radiation-detection/gamma-ray-spectroscopy/gamma-ray-spectra/gamma-ray-spectra-page-four
1 – Decay chainshttp://periodictable.com/Isotopes/086.222/
2 – table of isotopes (browser)http://nucleardata.nuclear.lu.se/toi/nucSearch.asp http://nucleardata.nuclear.lu.se/toi/radSearch.asp
2 – browser
2 – browser
2 – browserENERGY= X-axis
INTENSITY= Y-axis
(be careful: do we have
efficiency calibration?
3 – example Th-232
Real samples– mix of differentisotopes
γ-emittingdoughter isotopes of Th-232
Real samples– mix of differentisotopes
γ-emittingdoughter isotopes of Th-232
Real samples– mix of differentisotopes
4 – our isotopes
http://www.spectrumtechniques.com/products/sources/disk-sources-and-source-sets/
5 – our software
http://tukan.ncbj.gov.pl/files/UsersGuide_Tukan8k_2.3.pdf
5 – our software
http://tukan.ncbj.gov.pl/files/UsersGuide_Tukan8k_2.3.pdf
5 – our software
http://tukan.ncbj.gov.pl/files/UsersGuide_Tukan8k_2.3.pdf
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)