constants.json

{ 
    "lambda": {
	"fission": [8.5e-11,0.1e-11],
	"U238":  [0.000155125,0.000000083],
	"U235":  [0.00098485,0.00000067],
	"U234":  [0.00282206,0.00000080],
	"Th232": [0.0000495,0.0000025],
	"Th230": [0.0091705,0.0000016],
	"Pa231": [0.021158,0.00071],
	"Ra226": [0.4332,0.0019],
	"Rb87":  [0.000013972,0.000000450],
	"Re187": [0.000016689,3.8e-8],
	"Sm147": [0.000006540,0.000000049],
	"K40":   [0.00055305,0.00000132],
	"Lu176": [0.00001867,0.00000008]
    },
    "iratio": {
	"Ar40Ar36": [298.56,0.31],
	"Ar38Ar36": [0.1885,0.0003],
	"Ca40Ca44": [46.480,0.044],
	"Rb85Rb87": [2.59265,0.00085],
	"Sr84Sr86": [0.056549,0.0000715],
	"Sr87Sr86": [0.69938,0.00006],
	"Sr88Sr86": [8.37861,0.001624],
	"Re185Re187": [0.59738,0.000195],
	"Os184Os192": [0.000485,0.00011],
	"Os186Os192": [0.03889,0.00011],
	"Os187Os192": [0.04817,0.00003],
	"Os188Os192": [0.32474,0.00005],
	"Os189Os192": [0.39593,0.00004],
	"Os190Os192": [0.64388,0.00045],
	"Th230Th232": [0,0],
	"U234U238": [0,0],
	"U238U235": [137.818,0.0225],
	"Pb206Pb204": [9.307,0],
	"Pb207Pb204": [10.294,0],
	"Pb207Pb206": [1.106,0],
	"Pb208Pb204": [29.476,0],
	"Sm144Sm152": [0.115117,0.000189],
	"Sm147Sm152": [0.561134,0.000622],
	"Sm148Sm152": [0.420634,0.000392],
	"Sm149Sm152": [0.516973,0.000393],
	"Sm150Sm152": [0.275438,0.000459],
	"Sm154Sm152": [0.850468,0.000484],
	"Nd142Nd144": [1.14101,0.00070],
	"Nd143Nd144": [0.51154,0.00040],
	"Nd145Nd144": [0.34848,0.00015],
	"Nd146Nd144": [0.72228,0.00051],
	"Nd148Nd144": [0.24186,0.00030],
	"Nd150Nd144": [0.23691,0.00042],
	"Lu176Lu175": [0.026680,0.000013],
	"Hf174Hf177": [0.00871,0.00005],
	"Hf176Hf177": [0.2829,0.0030],
	"Hf178Hf177": [1.46710,0.00010],
	"Hf179Hf177": [0.7325,0],
	"Hf180Hf177": [1.88651,0.00012]	
    },
    "imass": {
	"U":    [238.02891,0.00003],
	"Rb":   [85.46776,0.00026],
	"Rb85": [84.9117924,0.0000027],
	"Rb87": [86.9091828,0.0000028],
	"Sr":   [87.62,0.01],
	"Sr84": [83.913426,0.000004],
	"Sr86": [85.9092647,0.0000025],
	"Sr87": [86.9088816,0.0000025],
	"Sr88": [87.9056167,0.0000025],
	"Re":   [186.20679,0.00031],
	"Re185": [184.952955,0.000003],
	"Re187": [186.9557505,0.0000030],
	"Os":    [190.23,0.003],
	"Os184": [183.952491,0.000003],
	"Os186": [185.953838,0.000003],
	"Os187": [186.9557476,0.0000030],
	"Os188": [187.9558357,0.0000030],
	"Os189": [188.958145,0.000003],
	"Os190": [189.958445,0.000003],
	"Os192": [191.961479,0.000004],
	"Sm": [150.36,0.03],
	"Nd": [144.2415,0.0013],
	"Lu": [174.9668,0.0001],
	"Hf": [178.49,0.02]
    },
    "etchfact": {
	"apatite": 0.93,
	"zircon": 1
    },
    "tracklength": {
	"apatite": 16.2,
	"zircon": 10.6
    },
    "mindens": {
	"apatite": 3.22,
	"zircon": 4.7
    }
}