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氩-氩年代测定
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氩-氩年代测定
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argon-argon dating
氩-氩年代测定
利用中子活化法使样品中的39K经过39K(n,p)39Ar反应转化为39Ar,然后用质谱计测定其40Ar/39Ar的比值,代替通常在钾-氩法中的40Ar/40K比值,计算岩石或矿物的地质年龄。
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method of multiple scales
method of multipliers
method of no-method
method of nonstandard analysis
method of nuclear recoil
method of oblique projections
method of observation
method of opposability
method of optimal coefficients
method of optimal elimination
method of optimization
method of orbits
method of orthogonal projection
method of paired comparison
method of parabolas
method of parallel translation
method of parameter introduction
method of partial fractions
method of partial waves
method of path coefficients
method of peak area measurement
method of peak height measurement
method of peak value measurement
method of penalty functions
method of persuasion education
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