Aer'ODE Possibilities

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• Single Dose Measurement
• Calibration
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• Strip Dose Measurement
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• Annexe

Calibration

• BGD measurement
  
• Calibration

I. BGD Measurement

II. Calibration

When main menu is displayed and Calibration selected, choose Calibration on the screen for to access this sheet.



On item Source : Four calibration modes are available :

• Select one mode in the source box selection.
  
• Select the existing type of dosimeter (Ex : Amber Perspex, FWT,...) or enter a new type with the keyboard. You can delete an old type of dosimeter with the F3 key as written in the message box on the bottom of the window.
  
• Select an existing batch of dosimeter (Ex 7F6_280 fof FWT dosimeter) or enter a new type with the keyboard. You can delete an old type of dosimeter with the F3 key as written in the message box on the bottom of the window.
  
• Complete the other sections (low limit, high limit, wavelength)
  
• When Réf. BGD box is selected a message appear in the source box.
  
  
  
  

If the mean value of the dosimeter background is used, measure this value by F1 key. A new sheet will appear :



Measure the absorbance of 40 non irradiated dosimeters. When the measurement is finished, the mean value will be automatically copied in the Réf. BGD box.

If you don't use the mean value (Ex : For Harwell dosimeters) complete this box with 0.000 value.

The reference background value is the value of the dosimeter background when the calibration is done.
The current background value is the value of the dosimeter background when the measurement is done. It should be updated every month.

• Complete the Réf UCTY box with the value of the incertainty of the reference dose given by the reference laboratory (Ex : NIST, NPL, Aérial ...).
  
• When Measure thickness box is selected :
  
  * If the thickness of each dosimeter is measured, select yes in this box
  
  * If the mean value of the dosimeter thickness is used, select no in this box. A new box will appear (Mean T).
  
  * If the mean value is known, enter it with the keyboard.
  
  * If you want to measure this value, type F1 key as written in the message box. A new sheet will appear :
  
  

Measure the thickness of 40 non irradiated dosimeters.

When the measurement is finished, the mean value will be automatically copy in the Mean thickness box.

Enter a note in the note box if necessary.

The heading is now completed. The measure can now be started

1. Manual data (Input all the data by the keyboard)

• Enter the sample N°, the absorbance and the thickness value by the keyboard. The specific absorbance is automatically calculated.
  
• Enter the absorbed reference dose of the current dosimeter.
  
• Repeat this procedure for each calibration data point

2. Single dosimeter (Absorbance and thickness are measured)

When the heading is complete, the software checks the communication between the PC, the spectrophotometer, and the thickness gauge (if applicable).

Make sure that for both, absorbance or thickness measurement, the equipment are correctly zeroed

• without dosimeter but with dosimeter holder for the spectrometer
  
• without dosimeter under the thickness gauge

The progress of the measurement depends on your choice in the control mode box (Beep, Tab Ctl or Robot). For more explanations of these two mode have a look in the general use section.

If, while the measurements the communication should be interrupted (RS232, Power supply ...) the Aer'ODE Software will detect the problem, save the data and advise the user.

The current wavelength and absorbance appear on the spectrophotometer’s screen.

• Go to the first cell (sample N°). Input your dosimeter Sample N° (00001 is the default N°).
  

If the individual dosimeter background has been measured, input the same sample N° in the cell that in the background file. The corresponding background will be automatically displayed in the cell called BGD.

• The spectrophotometer is automatically set to zero. As written on the screen, put the dosimeter in the spectrophotometer. The absorbance value is displayed on the screen.
  
• Take out the dosimeter of the spectrophotometer and put it under the thickness gauge (as written on the screen). The thickness value is displayed on the screen.
  
• The specific absorbance is automatically calculated.
  
• Enter the corresponding reference absorbed dose in the next column of this table.
  

If error occurs during measurement, use the mouse to modify the current line of the data inputs. Double click on the sample N° cell and measure again. Use the right click to erase a complete line (See modification and deleting part for more informations in general use section).

Repeat this procedure for each calibration data point.

3. Strip measurement (Absorbance is measured in continuous mode)

• Select "strip measurement" in the source selection.
  
• Complete the heading.

• Go to the first cell called Sample N°. Input your dosimeter sample N° (00001 is the default N°).
  
• The spectrophotometer is automatically set to zero. As written on the screen, put the dosimeter in the strip film moving equipment.
  
• Click the measure button. The measurement begins.
  During the measurement, the absorbance values are displayed on the PC’s screen. After the measurement close this window, the mean value of the absorbance is displayed in the absorbance cell.
  
• Enter the corresponding reference absorbed dose of the readout dosimeter in the next column of the table.
  
  If an error occurs during the measurement, use the mouse to modify the current line of the data inputs. Double click on the sample N° cell and measure again. Use right click to erase a complete line.
  (See modification and deleting part for more informations in general use section).

4. Import parameters (Coefficients of the curve (C0, C1, C2, C3, C4, C5, RMS, …) are input manually without any data point)

This mode is suited for the user who knows the calibration parameters (dosimeter background, dose range, coefficients of the calibration curve and uncertainty) for a type of dosimeter.

• Select "Import parameters" in the source selection.
  
• Complete all the cells of the heading and click the save button.

The measure part is now completed. The sheet of measure should be similar to the one below



Click the fitting button to display the curve. The software chooses the adequate order of the fitting polynome (1 to 5).

The F-ratio and RMS values are estimations of the quality of the fit. The latter is used for the dose uncertainty calculation (k=2). (See annexe about RMS, F-ratio and uncertainty calculation).

• Print the graphic by using the print button.
  
• Validate the calibration procedure by a click on the close button. The parameters are displayed on the screen. Calculated doses using the fitted curve are displayed and the residues deviation with the reference dose are mentioned (in %). Aberrant data's can be erased by the use of right click.
  
• On operator's instructions, data can be stored in the database (by a click on the save button) and automatically used for future dose measurements.
  
• To make another calibration click the clear button and begin this procedure again.

5. Access the database / Validation of the calibration parameters

A click on the list button displays the list of all the calibration data



A mask can be selected to display specific data. Four masks choices are available :

• Batch : Displays the data using the selected dosimeter batch only(Ex : 220 for CTA).
  
• Type : Displays the data of the selected type of dosimeter only(Ex : FWT).
  
• Operator : Displays the data created by a given operator only.
  
• Date : Displays the data created at a selected date only.

Validate your filter by a click on the Filter case.

Choose one of the files to see the corresponding data.

• Click the button in the upper part of the screen to modify data. Some cells in the sheet become yellow (Dose range, notes,…) as shown in the next picture. These cells can be updated (for example, if the dosimeter background value has changed, input the new value in the current background cell).
  
• Add a new data by a click on the button and proceed as written in the corresponding section of the selected choice (manual data, single measurement, …).
  
• Modify a dose data by a click on the corresponding dose cell.
  
• Erase a data line by a click on button when the pointer is in the desired data line

An authorized person must validate the calibration curve parameters in order to make it available for the routine measurement.

To do so, display the calibration data which are to be validated and click the right button of the mouse in the source item to display "V" in this box. Close the file.