Table 4.

Samples used for the study (type of sample, ablation zone) and the comparison of obtained results by LA-ICP-MS with those obtained by whole organ ICP-MS analysis after acid digestion

Sample	Type of sample	Ablation zone	Whole organ U average conc. (ICP-MS, ng g−1)	U conc. per zone (LA-ICP-MS, ng g−1)
1	Control (no U contamination)	Cortex	4a	12
2	U contaminated	Cortex/medulla	3256	4118b
3	U contaminated	Cortex	6729	11,700

^aThe average uranium concentration per 16-μm thickness histological cut is 13.5 ± 5.8 ng g⁻¹, calculated by ID-ICP-MS after acid digestion (n = 27). ^bCortical concentration, 5966 ng g⁻¹; medullary concentration, 2452 ng g⁻¹