The andrzej soltan institute for nuclear studies

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Program Tukan8k
2.3
Hardware control
Acquisition path
Acquisition path
2.3.1
Acquisition path is a set of devices together with their settings used in a
measurement process, which form experimental spectrum as a result of their
activity. It consists of the following elements: detector, high voltage supply,
spectroscopy amplifier and pulse height analyzer.
In the program concept, acquisition path for certain measurement is uniquely
defined by the parameters like: measurement geometry, detector type, high
voltage supply type and its voltage, amplifier type and selected gain, analyzer
card and its settings.
Inspection of current status of acquisition path and changing of its parameters is
possible in 
HARDWARE module
 only.
Sections 
Hardware setup
 and 
Parameters of analyzer
 describe how to
select analyzer type and its parameters settings
Program concept
2.4
Data
Working with the spectra
Data files
Data files
2.4.1
The measured spectra and various information about spectra can be saved in the
specialized files, like:
Spectra
spectrum data files – binary format – "*.wdm",   (native format of the program)
spectrum data files – ASCII format – "*.lst",    (one column contains counts in
channel values only) 
spectrum data files – ASCII format – "*.dat",   (number of channel and counts in
channel value are placed in two columns)
spectrum data files – ASCII format – "*.tab",   (table with counts)
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TUKAN 8k
Data
calibration files – binary format – "*.clb"
ROI definition files – binary format – "*.roi"
Reports
reports files – HTML format –  "*.htm"
reports files –  text format – "*.txt"
Libraries
nuclide library files (ASCII) – text format – "*.tnc"
standards library files (ASCII) – text format – "*.eff"
Configurations
hardware setup configuration files – text format – "*.cfh"
report configuration files – text format – "*.cfr"
Tukan installer creates a disk directories Library and Spectra. Library contains
libraries (for calibration, recognition, etc.). Spectrum and report files are stored in 
Spectra directory. The other files are in program default directory.
Spectra files formats
Program concept
Spectra files formats
2.4.2
File format:  .wdm
    - 
(binary format of MCA-type spectrum)
Nr of byte Length in
bytes
Data format
Description
0..3
4
integer
version code
4..5
2
word
number of channels
6..8005
(32768)
4 * 8k
integer
counts (up to 8192 channels * 4
bytes/chn)
(length depends on number of channels)
8006
4
longint
check code
8
double
sample mass
1
byte
sample mass unit
n  
ASCII (n*byte) analyzer type name
n  
ASCII (n*byte) serial number
n  
ASCII (n*byte) geometry
n  
ASCII (n*byte) name of spectrum
n  
ASCII (n*byte) spectrum description
8
double
date and time of start of acquisition
(format: TDateTime:Year:Month:Day:Hour:Mi
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Program Tukan8k
n:Sec)
4
integer
acquisition time (in s) – real
4
integer
acquisition time (in s) - live 
4
integer
indicator if calibration performed and
check code
...
energy, peak shape and efficiency
calibration data
...
list of ROIs
File format:  .wds
    - (
binary format of MCS-type spectrum
)
Nr of byte Length in
bytes
Data Format Description
0..3
4
integer
version code
4..5
2
word
number of channels
6..8005
(32768)
4 * 8k
integer
counts (up to 8192 channels * 4
bytes/chn)
(length depends on number of channels)
8006
4
longint
check code
8
double
sample mass
1
byte
sample mass unit
n  
ASCII (n*byte) analyzer type name
n  
ASCII (n*byte) serial number
n  
ASCII (n*byte) geometry
n  
ASCII (n*byte) name of spectrum
n  
ASCII (n*byte) spectrum description
8
double
date and time of start of acquisition
 
(format: TDateTime:Year:Month:Day:Hour:Mi
n:Sek)
4
integer
acquisition time
4
integer
number of sweeps
4
integer
number of channels of MCS 
4
integer
DwellTime
1
byte
units of DwellTime
Data files
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TUKAN 8k
2.5
Calibration – algorithms
The program offers three types of calibration: energy, peak shape and efficiency.
Peak shape calibration is used during automatic peak search process. All
operations of calibration are grouped in 
CALIBRATION module
.
Working panel of a calibration module is divided into three parts:
tabbed calibration data panel containing three tabs, each for one calibration type:
energy, peak shape and efficiency, and spectrum plot panel and ROI parameters
paneI.
Calibration process:
The set of commands for calibration execution is always the same for all three
types of calibration. They can be invoked from the main menu, context menu or
from the icons placed on dedicated toolbar.
The calibration data table is common for all calibration's types. Data set in that
table are completed progressively after turning particular calibrations on – what
does not mean that all of them must be executed together.
Energy calibration can be performed already during acquisition. After execution
of energy calibration you can continue measurement of pattern and after finish of
that measurement you can perform efficiency calibration.
Results of calibration are displayed as equation coefficients values and
calibration curve diagram.
Results of calibration can be saved to a specjal calibration file or can be saved
directly in a spectrum file. In both cases the contents of calibration data table can
also be saved.
Energy calibration
Peak shape calibration
Efficiency calibration
Energy calibration
2.5.1
Energy calibration is calculated using data pairs: peak position - energy. If these
data points are placed in the table automatically, the program calculates their
errors and takes them into account while calculating the calibration curve.
Fitting of energy values to the peaks position is done using polynomial function:
where: y – energy value in [keV], x – channel number, Ai – i-th coefficient of
equation, N – equation degree, (N = 1,2,3)
Calibration – general principles
Peak shape calibration
Efficiency calibration
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