Fig. 1From: Low-level 226Ra determination in groundwater by SF-ICP-MS: optimization of separation and pre-concentration methodsCounting rates in the Ra peak in solutions. The fixed concentration of Ba was 500 ng g−1. The Sr concentrations varied (X-axis): 1 – blank; 2 – 0; 3 – 10; 4 – 20; 5 – 30; 6 – 40; 7 – 50 ng g−1 Back to article page