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The use of XRF in the investigation of land contamination

The use of XRF in the investigation of land contamination. Jonquil Maudlin Bristol City Council. Content. Case study on allotments site Why we used XRF How XRF works Safety matters Correlation with traditional analysis Limitations and advantages Conclusions. Allotment characteristics.

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The use of XRF in the investigation of land contamination

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  1. The use of XRF in the investigation of land contamination Jonquil Maudlin Bristol City Council

  2. Content • Case study on allotments site • Why we used XRF • How XRF works • Safety matters • Correlation with traditional analysis • Limitations and advantages • Conclusions

  3. Allotment characteristics • 1.6 hectares • Plot size approx 250m2 (10 square rods) • 100 plots – multiple tenants • 1922 or earlier • No historic contamination • Sewage pipes • Chocolate factory

  4. Preliminary results

  5. Internal discussion Allotment reps Letters to all tenants Q and A for tenants Press release Meetings Communications

  6. Combustion residues Copper chrome arsenic wood treatment Mining waste Pesticides (codling moth in orchards) Chicken acaricide or growth promoter Rat bait Potential sources of As

  7. Potential costs • Lab analysis - £30,000 • Landfill as inert waste at £20 per m3 with 0.5 metre site strip • 0.5 x 250 x 20 = £2,500 per large plot • Total for site = £125,000 • Landfill as special waste at £200 per m3 • £25,000 per large plot • Total for site = £1,250,000

  8. X-ray tube Rh target 50 kV Fluorescence spectra Element concentration Elements heavier than Ti Sample thickness Calibration Lead in paint Alloys, precious metals Non-destructive Safety features How it works

  9. Spectrum

  10. Advice from RPA PIN and warning Interlock No target cut-out Collimated beam Low energy back scatter Use in controlled area Use test stand Shield and back-plate Dosimetry Annual critical safety check Safety matters

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