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{"isotope":"202Hg","element":"mercury","mass":201.97064,"uncertainty":3.804e-06}
{"isotope":"204Hg","element":"mercury","mass":203.97349,"uncertainty":2.184e-06}
{"isotope":"203Tl","element":"thallium","mass":202.97234,"uncertainty":8.19e-06}
{"isotope":"205Tl","element":"thallium","mass":204.97443,"uncertainty":8.532e-06}
{"isotope":"204Pb","element":"lead","mass":203.97304,"uncertainty":8.01e-06}
{"isotope":"206Pb","element":"lead","mass":205.97447,"uncertainty":7.986e-06}
{"isotope":"207Pb","element":"lead","mass":206.9759,"uncertainty":8.004e-06}
{"isotope":"208Pb","element":"lead","mass":207.97665,"uncertainty":8.01e-06}
{"isotope":"230Th","element":"thorium","mass":230.03313,"uncertainty":0.00001}
{"isotope":"232Th","element":"thorium","mass":232.03806,"uncertainty":0.00001}
{"isotope":"234U","element":"uranium","mass":234.04095,"uncertainty":0.00001}
{"isotope":"235U","element":"uranium","mass":235.04393,"uncertainty":0.00001}
{"isotope":"238U","element":"uranium","mass":238.05079,"uncertainty":0.00001}