Accuracy in quantitative analysis

This may not be possible for structures where access to concrete surfaces is limited like bridges in operation (accessible from below only and not from the pavement), retaining walls, foundations, piles etc. In those cases accuracy in quantitative analysis results will decrease unless sensors are combined to an array. 

Deng, R.-C., WilUams, P. (1989) Factors affecting precision and accuracy in quantitative analysis by secondary ion mass spectrometry. Ancd. Chem., 61,1946-1946. 

---