EFFECT OF MEASUREMENT TIME Longer analysis times give better precision and lower LODs
{"Image DocumentName": "EFFECT OF MEASUREMENT TIME Longer analysis times give better precision and lower LODs", "Image ImageDescription": "Results from analysis of 100 ppm Pb. Long measurement times. give \u2191S/N and \u2193LODs but provide. diminishing returns in precision. (%RSD can be misleading as. precision unrelated to accuracy) Short measurement times - poor statistics/precision. S/N = mean signal / standard deviation of instrument response (noise) As per theory, S/N is proportional to square root of measurement time. 1-2 min measurement gives a good compromise between speed and precision. Longer measurement times give better S/N and lower LODs.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}