Sun Nuclear 1136 Wireless Dosimetry User Manual
Sun Nuclear Corporation Wireless Dosimetry
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![78 Section 5. Reference informationData collectionAt the beginning of the measurement, when the Pod is told to start measuring, the 16 millisecond counter is zeroed. During Measurement, calculate the Dose and Rate from the FIFO array as follows:Dose:where DA, DB, DC, DD are the dose values for channels A, B, C, D and CFbtn,A, CFbtn,B, CFbtn,C, CFbtn,D, are the Calibration Factors for channels A, B, C, D on energy button ‘btn.’ (Tempcf)btn,cnr is defined below, cnr being A, B, C, D. This assumes that the timer counter was zeroed, i.e., A1,1 is the true elapsed time since pressing the energy key.Rate:where the RA, RB, RC, RD are the dose rate values for channels A, B, C, D during the past time interval of A1,1 to A2,1.Temperature correction factor This section describes how the IVD Control Module allows users to set up temperature compen-sation for their diodes.The routines are accessed from the “Temperature Coef” item from the main menu. A PIN code is required to proceed, followed by 1 to 4 serial numbers. After the serial numbers are selected and enter is pressed, the display then scans the active Pod’s calibration files, flagging as selectable those which contain any of the chosen serial numbers. You can then choose which calibration(s) are to be adjusted.Two coefficients are associated with each diode pertaining to temperature: Tc and V’. Tc is the diode’s change in sensitivity with respect to temperature. Its label is percent per degree Celsius. A typical value for this is 0.5%/deg, which is stored internally as 50. V’ is a factor which allows the IVD display to determine relative diode temperature from the diode’s junction voltage. Its units are millivolts per degree Celsius (typical value, -2.0mV/deg, which is stored as 200). Formulae for Tc and V’ are provided below. After you select your calibrations, you are presented with the option of either entering Tc and V’ manually for each detector, or finding the coefficients through an experiment. If they are entered manually, the values are simply stored in the selected calibrations for the selected detectors, and the setup is complete. For diodes with unknown coefficients, or to verify a coefficient, the IVD allows for an experiment instead of manual entry. Materials required for the experiment:• An IVD system with diodes connected• A 3 cm thick acrylic or solid water phantom • A laboratory thermometer with 0.1 degree C resolutionDA A12,A11,–BKGA⋅[]CFbtn A,Tempcf()btn A,⋅⋅=DB A13,A11,–BKGB⋅[]CFbtn B,Tempcf()btn B,⋅⋅=DC A14,A11,–BKGC⋅[]CFbtn C,Tempcf()btn C,⋅⋅=DD A15,A11,–BKGD⋅[]CFbtn D,Tempcf()btn D,⋅⋅=RA A12,A22,–()A11,A21,–()–BKGA⋅[]CFbtn A,Tempcf()btn A,⋅⋅=RB A13,A23,–()A11,A21,–()–BKGB⋅[]CFbtn B,Tempcf()btn B,⋅⋅=RC A14,A24,–()A11,A21,–()–BKGC⋅[]CFbtn C,Tempcf()btn C,⋅⋅=RD A15,A25,–()A11,A21,–()–BKGD⋅[]CFbtn D,Tempcf()btn D,⋅⋅=](https://usermanual.wiki/Sun-Nuclear/1136/User-Guide-565603-Page-82.png)
![80 Section 5. Reference informationDA, DB, DC, DDare all equal since they are all the same dose, you enter after the calibration beam turns off.There is no temperature correction because the calibration is at the temperature during calibra-tion. That is, in the expression for Tempcf, the difference TMPcnr –TCALbtn,cnr during calibration is zero and TCALbtn,cnr gets saved with the calibration.Error codesError codes allow Sun Nuclear technicians to quickly identify internal errors that could occur in the IVD system. When requesting customer service, you may be asked to display any error codes and report them. This information will allow the Sun Nuclear technician to evaluate the problem and find a solution. The intent of the error display is to aid the technician in troubleshooting.Displaying error codes on the PCWhen an error occurs, the letter “E” appears in the E column in Dose view. To view the meaning of the errors, right-click the “E” for the unit that is displaying it. An explanation of the error appears in a pop-up box (Figure 5-1).Figure 5-1. PC error code displayDisplaying error codes on display module1 Be sure the system is properly connected and powered up.2 On the Control Module, select the Software Version menu. See “To view the software ver-sion” on page 58.3 Key in the number “412” on the keypad. The error codes appear. It is possible that more than one error is displayed.CFbtn A,DAA12,A11,BKGA⋅–[]---------------------------------------------------=CFbtn B,DBA13,A11,BKGB⋅–[]---------------------------------------------------=CFbtn C,DCA14,A11,BKGC⋅–[]----------------------------------------------------=CFbtn D,DDA15,A11,BKGD⋅–[]----------------------------------------------------=Error 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0](https://usermanual.wiki/Sun-Nuclear/1136/User-Guide-565603-Page-84.png)
![Error codes 814 View and record the 16 digits that appear on the bottom row of the LCD screen. 5 To clear the error display, press ENTER. To leave, press STOP.Reading error codes on the display moduleEach Pod’s internal memory contains an ERROR CODE ARRAY (g_errs[8]) consisting of 8 bytes. Each byte represents an error “module,” and each module represents a group of functionally related errors. Each bit of the 8 bits in a module represents an error, for a total of 64 possible errors.The errors are displayed, in hexadecimal format, in a row of 16 characters. The characters, from left to right, are in groups of two digits, designated A & B, and are associated to an error module group, designated Module_0 to Module_7 (Table 5-1).To decode the displayed errors:1 Read the hexadecimal value of a non-zero character. From its position, determine the module and whether it is “A” or “B.”2 Using Table 5-2, read across for the hexadecimal character and determine which Error Bits are set, as indicated by the “X” in the column. 3 Using the Error Bits that were set from Table 5-2, find the corresponding errors in Table 5-3 for the Module group associated with the A-B combination.Table 5-1. Arrangement of modules and A and B characters in the displayModule_0 Module_1 Module_2 Module_3 Module_4 Module_5 Module_6 Module_7A B A B A B A B A B A B A B A BTable 5-2. Bit errors sethexAError Bits Set hexBError Bits SetBIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0001X1X2X2X3XX3XX4X 4X5XX5XX6XX 6XX7XXX7XXX8X 8X9X X 9X XAX X AX XBX XX BX XXCXX CXXDXX X DXX XE XXX E XXXF XXXX F XXXXTable 5-3. Error Codes Error Mask Bit CommentMODULE_0: SYSTEM INITIALIZATION (BYTE 0x0B2C)ERR 1 BIT 0 BEEP - Battery Data Group is Corrupt (will attempt to use last group)ERR 2 X BIT 1 BEEP - Both Battery Data Segment checksums are bad, using DefaultsERR 3 X BIT 2 BEEP – Store Battery Data FailedERR 4 X BIT 3 BEEP - System Data Checksum/Data is bad, using Defaults](https://usermanual.wiki/Sun-Nuclear/1136/User-Guide-565603-Page-85.png)
