Precision can be increased by

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Prepare for the NRCan XRF Analyzer Operator Certification Level 1 Exam. Utilize flashcards and multiple-choice questions with detailed hints and explanations. Ready yourself for a successful examination!

Multiple Choice

Precision can be increased by

Explanation:
More data leads to better precision. In XRF, each detected photon is counted, and the uncertainty of a count follows Poisson statistics, with a standard deviation equal to the square root of the number of counts. The relative uncertainty is 1 divided by the square root of the total counts. So increasing the measurement time raises the total counts, reducing the relative uncertainty and making results more precise. Shorter measurements produce fewer counts and larger fluctuations, lowering precision. Changing the instrument brand doesn’t inherently improve counting statistics, and reducing counts or time directly worsens precision.

More data leads to better precision. In XRF, each detected photon is counted, and the uncertainty of a count follows Poisson statistics, with a standard deviation equal to the square root of the number of counts. The relative uncertainty is 1 divided by the square root of the total counts. So increasing the measurement time raises the total counts, reducing the relative uncertainty and making results more precise. Shorter measurements produce fewer counts and larger fluctuations, lowering precision. Changing the instrument brand doesn’t inherently improve counting statistics, and reducing counts or time directly worsens precision.

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