CN113325458B - 一种地外样品氩-氩年龄和宇宙暴露年龄的联测方法 - Google Patents
一种地外样品氩-氩年龄和宇宙暴露年龄的联测方法 Download PDFInfo
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- 239000000523 sample Substances 0.000 description 39
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Abstract
本发明公开了一种地外样品氩‑氩年龄和宇宙暴露年龄的联测方法,包括包括以下步骤:A、对样品进行包装;B、将包装好的样品放入中子反应堆进行照射;C、对中子辐照后的样品进行Ar同位素测量,计算得到氩‑氩年龄和宇宙暴露年龄。本发明能够改进现有技术的不足,实现了一份样品的氩‑氩年龄和宇宙暴露年龄的高精度联测。
Description
技术领域
本发明涉及地外样品检测技术领域,尤其涉及一种地外样品氩-氩年龄和宇宙暴露年龄的联测方法。
背景技术
在研究地外样本性质时,对其氩-氩年龄和宇宙暴露年龄的测定是常见的检测项目。现有技术中,对于上述检测项目通常是分开独立进行检测的,不仅操作步骤繁多,而且最终的检测精度也有待提高。而且分开独立检测就需要准备两份样品,由于样品的不均匀性,两份样品分别测得的氩氩年龄和宇宙暴露年龄很有可能不能同时用来解释某种地质过程。由于地外样品的珍贵稀少性,如果能用尽量少的样品得到尽可能多的信息则显得尤为重要。
发明内容
本发明要解决的技术问题是提供一种地外样品氩-氩年龄和宇宙暴露年龄的联测方法,能够解决现有技术的不足,实现了一份样品的氩-氩年龄和宇宙暴露年龄的高精度联测。
为解决上述技术问题,本发明所采取的技术方案如下。
一种地外样品氩-氩年龄和宇宙暴露年龄的联测方法,其特征在于包括以下步骤:
A、对样品进行包装;
B、将包装好的样品放入中子反应堆进行照射;
C、对中子辐照后的样品进行Ar同位素测量,计算得到氩-氩年龄和宇宙暴露年龄。
作为优选,步骤A中,将待测样品用铝箔包装成直径5mm的圆饼状,每个样品包装与年代学标样在竖向上间隔放置,共同放入玻璃管中。
作为优选,步骤B中,将钾盐和钙盐分别包装成直径5mm的圆饼状,与盛放有待测样品的玻璃管一起进行中子照射,每次照射包含1-2个钾盐样品和1-2个钙盐样品。
作为优选,步骤C中,采取激光加热熔融或者高温炉加热熔融的方式释放照射后样品的气体组分,对气体组分进行活性气体去除后,将气体送入稀有气体质谱仪进行Ar同位素的测量;
其中,t为氩-氩年龄,λ为衰变常数,和分别为40K衰变为40Ar的两个分支的衰
变常数,40Ar*为放射性成因子体,39ArK是由39K经中子照射产生的39Ar,39K和40K分别为钾两
种同位素,Δ为照射时间,为能量为E的中子通量,为能量为E的中子反应截面,为宇宙暴露年龄,38Arcos为宇宙射线成因的38Ar,37ArCa为样品中的Ca在核反
应堆中子照射过程中产生的37Ar,P38/[Ca]为38Arcos相对于Ca浓度的产率,γ为37ArCa与Ca含
量相关的辐照参数。
作为优选,在样品测量前,按照与样品同样的测试流程测量系统本底,用来做本底校正,
带有下角标m表示是实际样品测量值,带有下角标b则表示是本底值。
作为优选,基于多次标准空气的测量,对质量歧视校正因子MDF进行校正,
(40Ar/36Ar)空气理论为空气中40Ar/36Ar比值的理论值,(40Ar/36Ar)空气实测为实际测量空气时得到的40Ar/36Ar比值。
作为优选,以40Ar为基准,分别根据质量数之差去做其余Ar同位素的质量歧视校正,
作为优选,对37Ar和39Ar进行衰变校正,
其中,mArcorr为质量数为m的Ar同位素经质量歧视校正后的值,m为质量数,即m=37
或39,是质量数为m的Ar同位素的衰变常数,是核反应堆的能量水平,n是照射的循环
数,d是每个照射循环的持续时间,单位小时,t是照射与测量间的时间间隔,单位小时。
作为优选,对中子辐照过程的干扰因素进行校正,
对照射后的K盐和Ca盐进行Ar同位素测量计算,得到K、Ca的校正参数,包括(36Ar/37Ar)Ca、(38Ar/39Ar)K、(39Ar/37Ar)Ca,(40Ar/39Ar)K,全部37Ar是中子辐照过程中Ca产生的,37Arcorr=37ArCa,
36Arcorr=36Ar-36ArCa=36Ar-(36Ar/37Ar)Ca*37ArCa
39ArK=39Arcorr-39ArCa=39Arcorr-(39Ar/37Ar)Ca*37ArCa
38Arcorr=38Ar-38ArK=38Ar-(38Ar/39Ar)K*39ArK
40Arcorr=40Ar-40ArK=40Ar-(40Ar/39Ar)K*39ArK。
作为优选,对宇宙射线成因的38Ar进行校正,
38Artrapped是捕获组分的38Ar的量,(36Ar/38Ar)cos是宇宙射线成因的36Ar/38Ar比值,(40Ar/36Ar)trapped是捕获组分的40Ar/36Ar比值。
采用上述技术方案所带来的有益效果在于:本发明是针对中子活化后的地外样品,通过改进样品处理方法和计算过程,以及校正区分不同来源的Ar同位素,实现了对同一样品的氩-氩年龄和宇宙暴露年龄的联测。
附图说明
图1是本发明一个具体实施方式的流程图。
具体实施方式
一种地外样品氩-氩年龄和宇宙暴露年龄的联测方法,包括以下步骤:
A、对样品进行包装;
B、将包装好的样品放入中子反应堆进行照射;
C、对中子辐照后的样品进行Ar同位素测量,计算得到氩-氩年龄和宇宙暴露年龄。
步骤A中,将待测样品用铝箔包装成直径5mm的圆饼状,每个样品包装与年代学标样在竖向上间隔放置,共同放入玻璃管中。
步骤B中,将钾盐和钙盐分别包装成直径5mm的圆饼状,与盛放有待测样品的玻璃管一起进行中子照射,每次照射包含1个钾盐样品和1个钙盐样品。
步骤C中,采取激光加热熔融或者高温炉加热熔融的方式释放照射后样品的气体组分,对气体组分进行活性气体去除后,将气体送入稀有气体质谱仪进行Ar同位素的测量;
其中,t为氩-氩年龄,λ为衰变常数,和分别为40K衰变为40Ar的两个分支的衰
变常数,40Ar*为放射性成因子体,39ArK是由39K经中子照射产生的39Ar,39K和40K分别为钾两
种同位素,Δ为照射时间,为能量为E的中子通量,为能量为E的中子反应截面,为宇宙暴露年龄,38Arcos为宇宙射线成因的38Ar,37ArCa为样品中的Ca在核反
应堆中子照射过程中产生的37Ar,P38/[Ca]为38Arcos相对于Ca浓度的产率,γ为37ArCa与Ca含
量相关的辐照参数。
为了进一步提高检测准确度,对检测过程中的参数进行如下校正。
在样品测量前,按照与样品同样的测试流程测量系统本底,用来做本底校正,
带有下角标m表示是实际样品测量值,带有下角标b则表示是本底值。
基于多次标准空气的测量,对质量歧视校正因子MDF进行校正,
(40Ar/36Ar)空气理论为空气中40Ar/36Ar比值的理论值,(40Ar/36Ar)空气实测为实际测量空气时得到的40Ar/36Ar比值。
以40Ar为基准,分别根据质量数之差去做其余Ar同位素的质量歧视校正,
对37Ar和39Ar进行衰变校正,
其中,mArcorr为质量数为m的Ar同位素经质量歧视校正后的值,m为质量数,即m=37
或39,是质量数为m的Ar同位素的衰变常数,是核反应堆的能量水平,n是照射的循环
数,d是每个照射循环的持续时间,单位小时,t是照射与测量间的时间间隔,单位小时。
对中子辐照过程的干扰因素进行校正,
对照射后的K盐和Ca盐进行Ar同位素测量计算,得到K、Ca的校正参数,包括(36Ar/37Ar)Ca、(38Ar/39Ar)K、(39Ar/37Ar)Ca,(40Ar/39Ar)K,全部37Ar是中子辐照过程中Ca产生的,37Arcorr=37ArCa,
36Arcorr=36Ar-36ArCa=36Ar-(36Ar/37Ar)Ca*37ArCa
39ArK=39Arcorr-39ArCa=39Arcorr-(39Ar/37Ar)Ca*37ArCa
38Arcorr=38Ar-38ArK=38Ar-(38Ar/39Ar)K*39ArK
40Arcorr=40Ar-40ArK=40Ar-(40Ar/39Ar)K*39ArK。
对宇宙射线成因的38Ar进行校正,
38Artrapped是捕获组分的38Ar的量,(36Ar/38Ar)cos是宇宙射线成因的36Ar/38Ar比值,(40Ar/36Ar)trapped是捕获组分的40Ar/36Ar比值。
在本发明的描述中,需要理解的是,术语“纵向”、“横向”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本发明,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本发明的限制。
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。
Claims (7)
1.一种地外样品氩-氩年龄和宇宙暴露年龄的联测方法,其特征在于包括以下步骤:
A、对样品进行包装:将待测样品用铝箔包装成直径5mm的圆饼状,每个样品包装与年代学标样在竖向上间隔放置,共同放入玻璃管中;
B、将包装好的样品放入中子反应堆进行照射:将钾盐和钙盐分别包装成直径5mm的圆饼状,与盛放有待测样品的玻璃管一起进行中子照射,每次照射包含1-2个钾盐样品和1-2个钙盐样品
C、对中子辐照后的样品进行Ar同位素测量,计算得到氩-氩年龄和宇宙暴露年龄:采取激光加热熔融或者高温炉加热熔融的方式释放照射后样品的气体组分,对气体组分进行活性气体去除后,将气体送入稀有气体质谱仪进行Ar同位素的测量;
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