CN2149626Y - 便携式高纯锗测金仪用源准直器 - Google Patents

便携式高纯锗测金仪用源准直器 Download PDF

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CN2149626Y
CN2149626Y CN 92220525 CN92220525U CN2149626Y CN 2149626 Y CN2149626 Y CN 2149626Y CN 92220525 CN92220525 CN 92220525 CN 92220525 U CN92220525 U CN 92220525U CN 2149626 Y CN2149626 Y CN 2149626Y
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gold
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shield
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谭盒宁
邵志新
车介川
张圆月
张显辉
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CHINESE INST OF TEST TECHNOLOGY
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Abstract

本实用新型提供一种便携式高纯锗测金仪用源 准直器,包括有屏蔽体的外壳和壳盖,设置在外壳内 的支架,安装在支架上且可上下滑动的源盒和源准直 环,以及设置在源准直环上方的射线吸收片。该源准 直器可使放射源发出的射线经过滤后再激发金矿石 中的金原子,减少对需要测量的金Kα峰的本底干 扰,大大提高高纯锗测金仪的测量灵敏度和精度。

Description

本实用新型涉及一种放射线测量仪元件,特别是涉及一种便携式高纯锗测金仪用源准直器。
目前在国内测定金矿石的品位主要采用化学分析法,虽然灵敏度高。但需刻槽取样,碾磨成细粉进行分析,周期较长,不能在开采时立即获得分析结果。此外,由于金分布很不均匀,有时矿体不明显,每次钻孔开采前都要地质人员到现场凭经验确定开采方位,必然带来差错,增大贫化率。若能利用测金仪现场快速定量测量矿石品位,即时指导开采,可大大降低贫化率,提高出矿品位,增加黄金产量。美国ORTEC公司研制出一种专利号为4,045,676的测金仪。该仪器利用γ放射源发出的射线激发待测矿石中的金原子,使金原子放出金的特征X射线,并由探头中的高纯锗吸收后产生脉冲信号,输入主机,经多道分析器分析并由微机处理后即显示出被测矿石品位(金含量g/t)。该仪器使用十分方便,但由于放射源是直接装在源盒内使用,源发出的射线未经过滤就直接照射在矿石上,因此增大了金Kα峰位置的本底,降低了测金灵敏度和精度。
本实用新型的目的在于对美国ORTEC公司测金仪进行改进,提供一种对放射源发出的射线可进行过滤的便携式高纯锗测金仪用源准直器。
本实用新型便携式高纯锗测金仪用源准直器包括有屏蔽体的外壳和壳盖,设置在外壳内的支架,安装在支架上可上下滑动的源盒和源准直环,以及设置在源准直环上方的射线吸收片。
其中屏蔽体是至少两种金属屏蔽体,一般外壳的屏蔽体外层为锡屏蔽体,内层为铅屏蔽体,壳盖的屏蔽体外层为不锈钢屏蔽体,内层为铅屏蔽体,外壳和壳盖可用不锈钢材料制作。外壳铅屏蔽体作用是吸收源射向其它方向上无用且对人体和探头有害的射线,锡屏蔽体还起到吸收铅特征X射线的作用,使其不能通过准直孔。外壳内的支架一般为带螺纹的三根支柱,以便源盒和源准直环上下滑动后用螺母固定。安装在支架上的源盒一般采用有盖的尼龙盒,用于存放如57Co放射源,源盒可由固定片安装在支架上。安装在支架上的源准直环位于源盒上方,是由至少两种金属材料构成的中部为锥形准直孔的园环,一般外层为锡准直环,内层为铅准直环。铅准直环用以准直射出的γ射线,只让射向准直孔的射线射出,其它方向的射线主要被铅准直环吸收,锡准直环除了起准直作用外,还吸收不利于测量的铅特征X射线。源盒和源准直环均能在支架上上下滑动,其目的是当源较强时,可将源盒和源准直环移向支架下端,反之移向上端,使射出准直孔的射线强度正好适应于探头允许的计数率范围。位于源准直环上方的射线吸收片是至少两层金属片,一般下层为镱吸收片,中层为锡吸收片,上层为不锈钢吸收片,可用压环将其固定在外壳屏蔽体上,使其完全过滤由准直孔射出的射线。
本实用新型便携式高纯锗测金仪用源准直器一般安装在测金仪探头支架上,位于探头侧面,经它准直后的γ射线用于激发金矿石中的金原子,使金原子产生特征X射线。
本实用新型便携式高纯锗测金仪用源准直器的优点是,当由源盒内射出准直孔的γ射线通过下层镱吸收片时,被强烈地吸收掉稍低于61.30kev的γ射线,大大减少对需要测量的金Kα1(68.79kev)和Kα2(66.98kev)射线的本底干挠。镱产生的特征X射线,主要由中层锡吸收片吸收,锡产生的特征X射线,主要由上层不锈钢吸收片吸收。通过三个层次的吸收过滤后,可使大于金激发能量80.71kev的γ射线比例增大,大大降低金Kα峰位置的本底,因此可对绝大多数金矿石进行金Kα峰测量。而金Kα射线的发射强度比金Kβ强6.5倍,从而提高测金仪测量灵敏度。而美国ORTEC公司测金仪由于放射源发出的射线未经过滤,这样对激发金原子后产生的金Kα射线本底干挠大,无法测量金Kα峰,而是主要测定金Kβ峰。由于金Kβ射线发射强度低,故测量灵敏度低。采用本实用新型后,可使高纯锗测金仪的测金灵敏度比美国ORTEC公司测金仪提高1.7倍。
下面结合附图详细说明本实用新型实施例。
图1:本实用新型结构示意图
本实用新型便携式高纯锗测金仪用源准直器包括有铅屏蔽体3和锡屏蔽体4的不锈钢外壳1,有不锈钢屏蔽体5和铅屏蔽体3的不锈钢壳盖2,设置在外壳1内带螺纹的支架6,通过固定片7安装在支架6上的尼龙源盒8和由锡准直环9、铅准直环10构成的中部有锥形准直孔11的源准直环,源盒8和源准直环由螺母12固定,以及设置在源准直环上方由镱吸收片13、锡吸收片14和不锈钢吸收片15组成的射线吸收片,并由压环16固定在外壳屏蔽体3、4上。

Claims (4)

1、一种便携式高纯锗测金仪用源准直器,其特征在于包括有屏蔽体的外壳和壳盖,设置在外壳内的支架,安装在支架上且可上下滑动的源盒和源准直环,以及设置在源准直环上方的射线吸收片。
2、如权利要求1所述的便携式高纯锗测金仪用源准直器,其特征在于源准直环是由至少两种金属构成的中部为锥形准直孔的园环。
3、如权利要求1所述的便携式高纯锗测金仪用源准直器,其特征在于屏蔽体是至少两种金属屏蔽体。
4、如权利要求1所述的便携式高纯锗测金仪用源准直器,其特征在于射线吸收片是至少两种金属片。
CN 92220525 1992-10-17 1992-10-17 便携式高纯锗测金仪用源准直器 Expired - Fee Related CN2149626Y (zh)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103649734A (zh) * 2010-09-30 2014-03-19 上海英迈吉东影图像设备有限公司 一种用于x射线成像的逐点扫描装置和方法
US8704183B2 (en) 2011-09-22 2014-04-22 Ut-Battelle, Llc Adaptors for radiation detectors
CN110573083A (zh) * 2017-04-28 2019-12-13 通用医疗梅拉泰股份公司 准直器和放射设备

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103649734A (zh) * 2010-09-30 2014-03-19 上海英迈吉东影图像设备有限公司 一种用于x射线成像的逐点扫描装置和方法
US8704183B2 (en) 2011-09-22 2014-04-22 Ut-Battelle, Llc Adaptors for radiation detectors
US9093186B2 (en) 2011-09-22 2015-07-28 Ut-Battelle, Llc Adaptors for radiation detectors
CN110573083A (zh) * 2017-04-28 2019-12-13 通用医疗梅拉泰股份公司 准直器和放射设备
CN110573083B (zh) * 2017-04-28 2024-01-12 通用医疗梅拉泰股份公司 准直器和放射设备

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