Fig. 1

Line scanning of a representative hair sample from hospital workers. A. SEM image of a hair by laser ablation. Pre-ablation was performed before the measurements. Run, measurements of platinum in this study; Run*, second measurement. B. a) Three indentical peaks in the hair (1, 2, 3) were obtained for both ¹⁹⁴Pt and ¹⁹⁵Pt in one hospital worker. b) No identical platinum peaks detected in a hair sample from another hospital worker