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Study Notes: LSC Maintenance and Calibration

The LSC is a sophisticated piece of analytical equipment with moving parts and delicate detection equipment. There are a number of maintenance operations that can be carried out and these are listed below.

Routine Maintenance: To be carried out in conjunction with the Becksley 5060 Maintenance Manual.

Maintenance Item
How to perform Maintenance Item
Comments
Clean Exterior of Cabinet Use a mild non-abrasive detergent. Use a ‘squeezed chamois’ - avoid excessive use of moisture.
Clean Interior of Cabinet Use a mild non-abrasive detergent. Use a ‘squeezed chamois’ - avoid excessive use of moisture.
Run Computer Diagnostics Wizard On the Main Menu access Diagnostics Drop down and click on “Computer Diagnostics Wizard’. Will check and automatically adjust all computer settings. If the ‘Attention File 12987’ comes up call Trevor.
Replace paper in Printer Follow instructions printed on the inside lid of printer. Paper is located in the office consumables store – ‘Becksley Form 23A”. A purple strip will run along the last 5m of paper and a red strip along the last 2m. Replace paper when red strip first appears.
Lubricate Conveyor Mechanism Use ‘Becksley Snow White Petroleum Jelly SWPJ 11’ and follow instructions in Maintenance Manual. Turn off LSC at wall before starting. Use petroleum jelly sparingly.
Replace Fusible Link Located under Control panel. Replace with ‘Becksley Fusible Link X67’. Turn off LSC at wall before starting. If link blows within 7 days of replacement, call the Becksley technician.
Clean Counting Chamber Use vacuum cleaner to remove dust and fluff. Turn off LSC at wall before starting.
Clean Counting Racks Clean in Radioactive Room sink using a mild non-abrasive detergent. A toothbrush may be used to remove dirt and smears.
Adjust Spindle Fold Mechanism Follow instructions in the Maintenance Manual. Turn off LSC at wall before starting. Do not put fingers near the pinion wheel (coloured red) as the teeth are extremely sharp.

Calibration of the LSC is done as follows:

  1. Turn on LSC and allow it to warm up for 5 minutes.

  2. Access Calibration in Start Up menu on the computer and select 3H and 35S isotopes only.

  3. Place counting rack in the LSC.

  4. Place 3H and 35S Calibration Standards and Quench Standard in positions 3 to 5 respectively of the counting rack. Position 1 and 2 are Blank and Cocktail blank.

  5. Close LSC cover.

  6. Set up the Red and Green Channels on the Control Panel on the LSC according to MTH 113 SOP: Becksley 5060 LSC.

  7. Set time to 15 minutes. The complete sequence will take three hours.

  8. Initiate calibration sequence by clicking on ‘Initiate Calibration’ on the computer.

  9. Depress button 'Run’ on the control panel.

  10. After calibration a Diagnostic Report will print out.

 

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