manualshive.com logo in svg

S.E. International URSA II, Руководство по эксплуатации, Страница: 20 / 41

Поделиться
Скачать
S.E. International URSA II Скачать руководство пользователя страница 20

20

found peaks and convert them to an ROI set.
The “Peak Search Sensitivity” control affects how “distinct” a peak needs to be before it is flagged as “found.” If 

it appears that to many peaks have been identified in a peak search, try lowering this value. And vice-versa…
The four radio buttons determine what which method is used in identifying the nuclide associated with a peak. 

The top item will associate a peak with a nuclide if the library energy is within the stated energy range of the 

centroid and is the
default identification method, using +/- 3 keV. The next item, if selected, will associate a peak with a nuclide 

if the library energy is within the stated percentage of the library energy. The third item, if selected, will 

associate a peak with a
nuclide if the library energy is anywhere within the area of the found peak. The fourth item, if selected, will 

associate a peak with a nuclide if the library energy is anywhere within the FWHM (full width at half maximum) 

calculated for the found peak.
There has been no computer program ever written that surpasses an experienced human eye at discriminating 

whether a given portion of a spectrum represents a peak or not. Therefore, URSA-II MCA allows the user wide 

latitude in editing (or ignoring) the results of the computerized peak search.
If the “Allow Edit” box is selected, the controls for editing the found peaks are enabled.
When “Double Click Adds Peak” is selected, double clicking on a portion of the spectrum will add a “found  

peak.” This new peak is treated as the others found by the computerized search, and this method of adding 

“found peaks” may beused instead of or as a supplement to the computerized search.
When “Show FWHM” is checked, the FWHM (full width at half maximum) calculated for each found peak will 

be displayed on the spectrum.
The arrow buttons below “Selected Peak” change the currently selected found peak, which is indicated by the 

displayed number and highlighted in fuchsia in the spectrum display. Data displayed and edits made will apply 

only to the currently selected found peak.
Values for the Centroid, Left Edge, and Right Edge can be altered by using the single and double arrow buttons. 

The single arrow buttons will move the relevant value up or down the spectrum by one channel, and the 

double arrow buttons will move the relevant value up or down the spectrum by 10 channels. The current value 

will be displayed (in keV) in the associated gray box.
Finally, the “Kill Peak” button will permanently delete the currently selected found peak (whether found by the 

computer search or manually assigned).

ROI-Based

This displays the ROI-based Quantitative Analysis Panel.
Clicking the “ROI Analysis” button performs an ROI by ROI analysis of the currently displayed spectrum, 

calculating activities for each ROI. A summary of this data is displayed for each ROI. Change the currently 

selected ROI (indicated by fuchsia on the spectrum display) by clicking the arrow buttons.
Clicking the “Report…” button displays the detailed results of the ROI-based quantitative analysis. From the 

“report” screen, this data can be viewed, printed, or saved. Note: The contents of this report and use of the 

report screen are discussed in detail in other portions of this manual.

Sample Info

This displays the Sample Data Panel for entering sample descriptions and quantities.

Содержание URSA II

Страница 1: ...1 S E International Inc P O Box 39 436 Farm Rd Summertown TN 38483 USA 1 800 293 5759 1 931 964 3561 Fax 1 931 964 3564 www seintl com radiationinfo seintl com INTERNATIONAL OPERATION MANUAL...

Страница 2: ...s 9 Misc 9 View Menu 9 Sound 10 Library 10 Transfer 10 Help 10 Button Bar 11 Hardware Status Bar 12 New User Hints Bar 12 Spectrum Display 12 Spectrum Status Bar 12 Acquisition Controls and Indicators...

Страница 3: ...erforming an Energy Calibration 26 Performing a Shape Calibration 28 Creating a Regions of Interest ROI Set 29 Manually Creating or Editing an ROI Set Manual Method 30 Performing an Efficiency Calibra...

Страница 4: ...URSA II accepts positive negative or pre shaped positive pulses Pulse heights should not exceed approximately 5 volts Uses 110V or 220VAC to 12V DC adapter 1 25A or runs on 6 internally recharged NiM...

Страница 5: ...ined batteries voltages The NiMH batteries should power the URSA II for about four hours Note however that this figure can change dramatically based on the current draw of the detector high voltage ot...

Страница 6: ...in and power on URSA II 4 Start the software URSA II MCA searches all COM ports for the URSA II automatically 5 A detector must be entered before URSA II can be opened Many of URSA II s calibration f...

Страница 7: ...ing a displayed spectrum to an URSA II spectrum file usf The next two Save Spectrum and Load as Background and Save Spectrum and Load to Static Display also save the spectrum but additionally either l...

Страница 8: ...order to save printer ink This is the recommended method of printing charts The final menu item Exit closes URSA II MCA Warnings will occur if the currently displayed spectrum has not been saved and...

Страница 9: ...n See instructions on page 32 The next seven QQQ menu items Full Screen through Sample Data Panel are identical in function to the seven buttons in the Button Panel on the lower right of the Spectrum...

Страница 10: ...h nn ss where yyyy is the four digit year mm is the two digit month dd is the two digit day of the month hh is the two digit hour in 24 hour format nn is the two digit minutes past the hour and ss is...

Страница 11: ...se common sense in applying different colors For example if the Background color is set to be the same as the Main Spectrum color the display will appear blank Undo Zoom gives a method for restoring t...

Страница 12: ...button caption becomes Hide and clicking on it or on the x in the upper right corner will close the window The order of the display can be based on energy or yield ascending or descending Change this...

Страница 13: ...area Once a spectrum is zoomed it can be panned by rightclicking the mouse on the spectrum display and dragging it Un zoom by dragging a box any size anywhere on the spectrum display from lower right...

Страница 14: ...isition has previously been stopped The Clear button erases all data from the spectrum and resets the elapsed time to zero If a spectrum is currently acquiring acquisition will stop No warning is give...

Страница 15: ...when the spectrum is displayed in 256 or so channels URSA II MCA s 4096 channels of data can be filtered to give a smoother representation of the energy continuum Try using different values of smoothi...

Страница 16: ...nudges to compensate for spectrum drift caused by temperature changes in the detector If an even smaller shift in gain is needed try adjusting the high voltage by tiny increments including decimal val...

Страница 17: ...set This name becomes the one displayed in the spectrum status bar and is also used to identify individual ROIs in analysis reports Approximately in the middle of the ROI panel are two radio button co...

Страница 18: ...will be unlocked for editing If this box is not checked the data for the last calibration can be viewed but not altered The arrow buttons will change the currently selected specific ROI within the gre...

Страница 19: ...ed printed or saved by clicking the Report button Note The contents of the report and use of the report window are discussed in detail in other portions of this manual Peak Based This displays the Pea...

Страница 20: ...h and this method of adding found peaks may beused instead of or as a supplement to the computerized search When Show FWHM is checked the FWHM full width at half maximum calculated for each found peak...

Страница 21: ...sults will be displayed in subsequently displayed reports The Save Spectrum button repeats the function under the File Menu It is also included here for convenience The Clear Fields button deletes the...

Страница 22: ...emoved to improve performance Both libraries contain many calculated multiplets as an aid These can of course be edited or disabled Either library can be edited and saved under a different name creati...

Страница 23: ...ently displayed isotope Click on any photon energy in the grid and use the Kill Energy button to completely delete that photon energy from the currently displayed isotope Use the Add Isotope button to...

Страница 24: ...g or recording changes in count rate over time An analog meter style display also shows the current count rate MCS mode allows you complete control over how the data is accumulated and displayed Menu...

Страница 25: ...rt trace to be displayed as a line as points as a line with points the default bars or as an area graph The next three menu items Chart Background Color Chart Trace Color and Chart Labels Color allow...

Страница 26: ...unt of time in the input box Typing in the Time box will immediately un check it pressing Enter on the keyboard after changing the Time value will re check it Directly underneath the Time sec input bo...

Страница 27: ...erform Energy Calibration 3 Perform a Shape Calibration Following this step URSA II is ready to provide qualitative analysis 4 Create a Regions of Interest ROI Set This is in preparation for efficienc...

Страница 28: ...e URSA II has two detector inputs Input 1 is the series C connector right next to the DB9 serial connector This input has the signal and the high voltage coupled just like on most hand held instrument...

Страница 29: ...it can be displayed usefully as a spectrum These two controls are used together to create an overall gain The overall gain is generally the value you should follow It is worth mentioning that the gai...

Страница 30: ...ed If different sets of hardware settings are desired for the same detector create a new detector based on that detector changing the description to reflect the different purpose Procedure 4 Click on...

Страница 31: ...that detector is attached to the URSA II the URSA II is switched on the URSA II MCA software has been successfully started a radioactive source of known isotopic composition is on the detector and URS...

Страница 32: ...simple spectrum such as 137Cs 2 From the Utility menu select Energy Calibrate The energy calibration window will appear If this is the first energy calibration for this detector the energies for the...

Страница 33: ...een performed Discussion For NaI Tl detectors the Full Width at Half Maximum FWHM is proportional to the square root of the centroid energy as is the overall peak area The Shape Calibration helps dete...

Страница 34: ...t method a spectrum is acquired and the Find Peaks buttons is pressed from the Peak Based panel edited as desired then saved as an ROI set The ROI set can be further edited from the ROI Panel includin...

Страница 35: ...while the single arrows adjust the settings in approximately 0 5 keV increments c To delete a peak first select the peak to be deleted using the Selected Peak arrow set Once the peak is highlighted cl...

Страница 36: ...io button c Position the cursor at the suitable location on the spectrum display and double click d The energy and associated channel will be displayed in the appropriate boxes on the ROI Panel e When...

Страница 37: ...sed Procedure 1 Acquire a spectrum of your efficiency calibration source A background spectrum should also be subtracted from the display if that is how your samples will be analyzed 2 Click on Effici...

Страница 38: ...small window will pop up and display an isotope selection drop down menu and an energy peak selection drop down menu The hardware settings panel will also open along the bottom of the spectrum display...

Страница 39: ...ts suppliers be liable for any consequential incidental direct indirect special punitive or other damages whatsoever including without limitation damages for loss of business profits business interrup...

Страница 40: ...or will repair the defect and return the instrument to you prepaid without charge for parts or labor Shipping cost to the factory for repair is the responsibility of the customer Customer is also resp...

Страница 41: ...S CITY STATE ZIP COUNTRY Please fill out this form and send it back to us if you would like to be notified of the NIST calibration renewal for your instrument to S E International Inc P O Box 39 436 F...

Отзывы:

Нет отзывов