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)