CN101434840B - 一种固体热释光剂量计材料的制备方法 - Google Patents

一种固体热释光剂量计材料的制备方法 Download PDF

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CN101434840B
CN101434840B CN2008100516700A CN200810051670A CN101434840B CN 101434840 B CN101434840 B CN 101434840B CN 2008100516700 A CN2008100516700 A CN 2008100516700A CN 200810051670 A CN200810051670 A CN 200810051670A CN 101434840 B CN101434840 B CN 101434840B
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thermoluminescence
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thermoluminescent dosemeter
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dosimeter
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CN101434840A (zh
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李成宇
姜丽宏
庞然
苏锵
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Changchun Institute of Applied Chemistry of CAS
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Abstract

一种固体热释光剂量计材料涉及的化学式为:Sr2P2O7:xEu2+,yPr3+。把磷酸氢锶、磷酸二氢铵、三氧化二铕和氧化镨;按化学剂量比计算称取原料,研细混匀后装入焙烧容器,将该焙烧容器放入高温炉内,烧结气氛为CO气体、H2气,或N2和H2混合气,在900~1400度烧结3~6个小时,得到目标材料。被γ射线辐照后,其热释发光曲线为单峰,峰温位于439.5K,热释光灵敏度是目前广泛使用的灵敏度最高的剂量计(LiF:Mg,Cu,P)的4.6倍, 并且在热释光的剂量响应在100-1000mGy成较好的线性,是一种好的热释光剂量计材料。

Description

一种固体热释光剂量计材料的制备方法
技术领域
本发明涉及一种固体热释光剂量计材料的制备方法
技术背景
固体热释光剂量计已广泛应用于辐射防护、辐射治疗、环境检测、地质年代测量、考古、航天等诸多领域。LiF在常温下的低衰退特点以及它的抗腐蚀性、抗磨损性和难溶于水等特性使它成为个人和环境监测方面最流行的热释光材料之一。Cameron及其同事研制出一种主要由镁和钛激活的材料LiF:Mg,Ti叫做TLD-100,被广泛的使用并在许多方面作为标准的热释光发光体(A.G.Kozakiewicz,A.T.Davidson,D.J.Wilkinson,The effect of pre-irradiation annealing on TLglow curves of LiF(Mg),Nucl.Instrum.Meth.Phys.Res.B,2000,166,577-580)。除了镁、钛掺杂的LiF外,研究人员还研究了其它离子掺杂的性能优越的LiF磷光体,例如:LiF:Mg,Cu,P;LiF:Mg,Cu,Na,Si等(K.Tang,Dependentce of thermoluminescence in LiF:Mg,Cu,Na,Si phosphor on Na dopant concentration and thermal treatment,Radiat.Meas.,2003,37,133-144.A.J.J.Bos,K.Meijvogel,J.Th.M.deHaas,P.Bilski,P.Olko,Thermoluninescence properties of LiF(Mg,Cu,P)with different copper concentrations,Radiat.Protec.Dosim.,1996,65,199-202.)。其中LiF:Mg,Cu,P以其较高的热释光灵敏度(可达到LiF:Mg,Ti的25倍)而被广泛应用于个人和环境监测领域。但是,LiF:Mg,Cu,P也存在一些缺点:1.它的热释发光峰峰形复杂,由多个发光峰组成,不利于剂量信号的测试;2.高温发光导致高的残留信号;3.当最大加热温度超过270℃时,它的热释光灵敏度会降低(A.J.J.Bos,High sensitivity thermoluminescence dosimetry,Nucl.Instrum.Meth.Phys.Res.B,2001,184,3-28)。因此,寻找一种性能更加优异的热释光剂量计材料还在进行中,研究人员对硼酸盐、硅酸盐、磷酸盐、硫酸盐等进行了大量的研究,致力于找到一种性能优越的热释光剂量计材料。
发明内容:
为了解决已有技术存在的问题,本发明目的是提供一种固体热释光剂量计材料及制备方法。
本发明的一种固体热释光剂量计材料的化学式为:
Sr2P2O7:xEu2+,yPr3+
式中,x=0.1%~10mol%,y=0.1%~10mol%,其中,x和y分别为掺杂离子Eu2+和Pr3+的摩尔数与Sr原子的摩尔数的百分比。
一种固体热释光剂量计材料的制法,其特征在于步骤和条件如下:
原料为分析纯的磷酸氢锶、分析纯的磷酸二氢铵、纯度为99.99%的三氧化二铕和纯度为99.99%的氧化镨;
按化学剂量比计算称取以上原料,研细混匀后装入焙烧容器,将该焙烧容器放入高温炉内,烧结气氛为CO气体、H2气,或N2和H2混合气,在900~1400度烧结3~6个小时,得到一种固体热释光剂量计材料。
有益效果:本发明以焦磷酸锶为基质,以铕和镨为激活剂制备了一种高灵敏度的固体热释光剂量计材料。此种热释光剂量计材料的灵敏度是目前广泛使用的灵敏度最高的剂量计(LiF:Mg,Cu,P)的4.6倍;并且热释光峰为单峰,便于测试信号;热释光强度与剂量响应成线性关系;同时,这种剂量计材料的制备方法简单,原料便宜易得,生产成本低廉,产品化学性质稳定,蓬松非常易研磨。
附图说明
图1是本发明的热释光剂量计材料被γ射线辐照后的热释光发光曲线图。此发光峰为单峰,峰温位于439.5K。对于一个理想的热释光剂量计材料来说,简单的发光峰是它的特征之一。
图2为本发明的热释光剂量计材料与LiF:Mg,Cu,P的剂量响应曲线对比图,由图2可以看出本发明的热释光剂量计材料和LiF:Mg,Cu,P的剂量响应均成线性,并且本发明的剂量计材料的灵敏度是LiF:Mg,Cu,P的4.6倍。说明本发明的材料可用作固体热释光剂量计材料。
具体实施方式
实施例1
原料为SrHPO4(分析纯)、NH4H2PO4(分析纯)、Eu2O3(99.99%),Pr6O11(99.99%)它们之间的摩尔比为1∶0.05∶0.02∶0.02,把原料在研钵中充分研磨均匀,烘干,放置入刚玉坩埚中,然后再放入大刚玉坩埚中,周围填充碳棒,放入高温炉中900℃焙烧3个小时,自然冷却到室温,取出研磨,即得样品。所得产品为白色的粉末,其热释光峰如图1所示,其发光曲线为单峰,峰温位于439.5K。
实施例2
原料为SrHPO4(分析纯)、NH4H2PO4(分析纯)、Eu2O3(99.99%),Pr6O11(99.99%)它们之间的摩尔比为1∶0.05∶0.001∶0.08,把原料在研钵中充分研磨均匀,烘干,放置入刚玉坩埚中,然后再放入大刚玉坩埚中,周围填充碳棒,放入高温炉中1000℃焙烧3个小时,自然冷却到室温,取出研磨,即得样品。所得产品为白色的粉末,其热释光峰如图1所示,其发光曲线为单峰,峰温位于439.5K。
实施例3
原料为SrHPO4(分析纯)、NH4H2PO4(分析纯)、Eu2O3(99.99%),Pr6O11(99.99%)它们之间的摩尔比为1∶0.05∶0.005∶0.001,把原料在研钵中充分研磨均匀,烘干,放置入刚玉坩埚中,然后再放入大刚玉坩埚中,周围填充碳棒,放入高温炉中1200℃焙烧5个小时,自然冷却到室温,取出研磨,即得样品。所得产品为白色的粉末,其热释光峰如图1所示,其发光曲线为单峰,峰温位于439.5K。
实施例4
原料为SrHPO4(分析纯)、NH4H2PO4(分析纯)、Eu2O3(99.99%),Pr6O11(99.99%)它们之间的摩尔比为1∶0.05∶0.1∶0.02,把原料在研钵中充分研磨均匀,烘干,放置入刚玉坩埚中,然后再放入大刚玉坩埚中,周围填充碳棒,放入高温炉中1300℃焙烧5个小时,自然冷却到室温,取出研磨,即得样品。所得产品为白色的粉末,其热释光峰如图1所示,其发光曲线为单峰,峰温位于439.5K。
实施例5
原料为SrHPO4(分析纯)、NH4H2PO4(分析纯)、Eu2O3(99.99%),Pr6O11(99.99%)它们之间的摩尔比为1∶0.05∶0.02∶0.1,把原料在研钵中充分研磨均匀,烘干,放置入刚玉坩埚中,然后再放入大刚玉坩埚中,周围填充碳棒,放入高温炉中1400℃焙烧6个小时,自然冷却到室温,取出研磨,即得样品。所得产品为白色的粉末,其热释光峰如图1所示,其发光曲线为单峰,峰温位于439.5K。

Claims (2)

1.一种固体热释光剂量计材料,其的化学式为:
Sr2P2O7:xEu2+,yPr3+
式中,x=0.1%~10mol%,y=0.1%~10mol%,其中,x和y分别为掺杂离子Eu2+和Pr3+的摩尔数与Sr原子的摩尔数的百分比。
2.如权利要求1所述的一种固体热释光剂量计材料的制法,其特征在于步骤和条件如下:
原料为分析纯的磷酸氢锶、分析纯的磷酸二氢铵、纯度为99.99%的三氧化二铕和纯度为99.99%的氧化镨;
按化学剂量比计算称取以上原料,研细混匀后装入焙烧容器,将该焙烧容器放入高温炉内,烧结气氛为CO气体、H2、或N2和H2混合气,在900~1400度烧结3~6个小时,得到一种固体热释光剂量计材料。
CN2008100516700A 2008-12-25 2008-12-25 一种固体热释光剂量计材料的制备方法 Expired - Fee Related CN101434840B (zh)

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US3882041A (en) * 1973-09-26 1975-05-06 Rca Corp Europium-activated alkaline-earth pyrophosphate phosphors
CN1888010A (zh) * 2006-07-14 2007-01-03 中山大学 一种掺有铜银磷的Li2B4O7热释光磷光体及其制备方法

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US3882041A (en) * 1973-09-26 1975-05-06 Rca Corp Europium-activated alkaline-earth pyrophosphate phosphors
CN1888010A (zh) * 2006-07-14 2007-01-03 中山大学 一种掺有铜银磷的Li2B4O7热释光磷光体及其制备方法

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RanPangetal.Anovelblue-emittinglong-lastingproyphosphatephosphorSr2P2O7:Eu2+ Y3+.《Journal of Physics and Chemistry of Solids》.2008

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