Zeta: The Ultimate Solution to Fission-Track Analysis Calibration or Just an Interim Measure?
Zeta: The Ultimate Solution to Fission-Track Analysis Calibration or Just an Interim Measure?
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Zeta：裂变径迹分析校准的终极解决方案还是只是临时措施？
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发表时间：
1998
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影响因子：
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通讯作者：
A. Hurford
中科院分区：
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作者：
A. Hurford
由于缺乏独特的系统校准加上径迹退火的低阈值，裂变径迹（FT）方法在20世纪70年代被认为是一种不充分和不精确的定年方法。系统校准有多种λf 238U自发裂变衰变常数值和中子剂量测定方案，实验室间标准化很少。方法上的差异也给校准带来了微妙的变化，而这些变化往往无法被识别。一种比较校准方法的复兴，即仔细选择的年龄标准的多重测年得出校准因子zeta，似乎绕过了以前的问题。在1988年贝桑松FT研讨会上达成共识后，zeta已被大多数FT工作者采用，并且仍然是大多数出版和商业应用中的常用校准方法。随着中子注量剂量学的进步和确定λf的精确实验的证据，提出应该重新检查zeta，并将那些能够量化的因素与不太容易确定的程序因素分开。强调了这种科学进步的尝试被视为打破校准共识的危险。有人认为，FT方法的应用程序应继续使用现有的校准计划，与战略，旨在解决zeta到其组成部分运行的并行项目，没有交叉。如果在校准方面取得了重大进展，则应将案例提交给金融时报界，以按照1988年贝桑松协议的模式进行系统修订。
Because of the lack of unique system calibration coupled with a low threshold for track annealing, the fission-track (FT) method was perceived in the 1970s as an inadequate and imprecise dating method. System calibration had a multiplicity of λf 238U spontaneous fission-decay constant values and neutron dosimetry schemes with little inter-laboratory standardisation. Differences in methodology also introduced subtle variations into calibrations which often went unrecognised. Resurrection of a comparative calibration approach whereby the multiple dating of carefully selected age standards derived a calibration factor zeta, seemingly circumvented previous problems. Following consensus agreement at the 1988 Besancon FT Workshop, zeta has been adopted by a majority of FT workers and remains the common calibration approach in most published and commercial applications. With advances in neutron fluence dosimetry and evidence of precise experiments to determine λf, the case is advanced that zeta should be re-examined and those factors capable of quantification be separated from less readily determinable procedural factors. The danger of such attempts at scientific advance being perceived as a break-up of the calibration consensus is highlighted. Argument is made that applications of the FT method should continue to use existing calibration schemes, with strategies aimed at resolving zeta into its component parts run as parallel projects with no crossover. If and when significant advance in calibration is achieved, the case should be presented to the FT community for a systematic revision following the model of the 1988 Besancon agreement.