Introduction

• context: low-level counting

• need net count rate and its standard deviation

• “decision level” (DL) used to decide whether activity is present

• DL is the lowest useable action level

• ANSI/HPS N13.30-1996, MARSSIM, etc., use same DL formula from Currie (1968)

  • Currie, L.A. Anal. Chem. 40(3):586-593 (1968)
  • DL is same as Currie’s “critical level,” LC

Previous slide

Next slide

Back to first slide

View graphic version