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https://asposverige.se/tag/peak-soil/ Peak soil – ASPO Sverige peak soilasposverige https://pure.sruc.ac.uk/en/publications/the-effect-of-energy-peak-drift-on-the-calibration-of-a-high-reso/ The effect of energy peak drift on the calibration of a high-resolution gamma-ray soil density... the effecthigh resolutiongamma raysoil densityenergy