共查询到20条相似文献,搜索用时 171 毫秒
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~(90)Sr-~(90)Y发生器的研制 总被引:1,自引:1,他引:0
本文比较系统地介绍为放射免疫治疗用~(90)Sr-~(90)Y发生器的研制,各种分离、分析的条件实验。国产732型阳离子交换树脂成功地被用于~(90)Sr,~(90)Y的分离。得到的~(90)Y可满足医学临床应用要求,~(90)Y的去污因子为10~6。本工艺简便、安全.每740MBq~(90)Y中,~(90)Sr杂质沾污仅为0.74kBq左右。~(90)Sr系剧毒性核素,人终身允许剂量为74kBq.若病人一次接受740MBq~(90)Y治疗。那么接受上百次治疗,方能达到其终身允许剂量。本发生器的淋洗效率可达98%,可推荐用于单克隆抗体的标记,临床放射免疫治疗。 相似文献
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土壤中^90Sr的测定 总被引:3,自引:0,他引:3
文章介绍了土壤中~(90)Sr的测定方法。主要包括盐酸浸取、草酸盐沉淀、HDEHT-Kel-F色层分离、草酸钇沉淀制源和β测量。着重研究了沉淀时pH和洗涤酸度对~(152,154)Eu去污因数的影响。本方法对~(137)Cs,~(99)Tc,~(125)I,~(60)Co,~(106)Ru-~(106)Rh的去污因数大于10~4,对~(144)Ce,~(147)Pm,~(152,154)Eu去污因数大于10~3。对50g土壤、钇的平均化学回收率为75.2±9.6%,方法最小可测限为3.2×10~(-4)Bq/g。测得环境土壤~(90)Sr含量为5.5×10~(-4)~2.6×10~(-2)Bq/g。还分析了IAEA标准土壤样品,结果的相对误差为5.6%。 相似文献
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食品的减钾总 β 放射性测定 总被引:1,自引:0,他引:1
一、前言钾是各类食品中无机盐的主要成份之一。各类食品中钾和~(40)K的含量列子表1,从表1可见,除糖类外大部分食品中的~(40)K 放射性均超过了我国国家标准局颁布的食品卫生标准~([1])(1978)中~(90)Sr的限制量,部分食品超过了~(137)Cs的限制量(各类食品中~(90)Sr等核素的限制量列于表2)。因此,总β放射性测定方法虽然非常简便易行,但在食品达限制量污染的检 相似文献
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辐射显色薄膜电子高剂量计的剂量学特性 总被引:1,自引:0,他引:1
文章报道了用PR-CN(PVB)辐射显色薄膜测量电子吸收剂量的某些重要的剂量学特性:在0.3-120kGy范围内,吸收剂量(D)与单位厚度光密度变化(ΔOD/mm)有良好的线性关系;电子能量的依赖性小,~(147)Pm和~(90)Sr ~(90)Y响应之比约为1:2.4;对中能以上的电子剂量响应在实验误差范围内、与电子平衡条件下~(60)Co γ辐射剂量响应相同;在实验用到的平均剂量率范围内(约0.1—5×10~4Gy/min),响应和剂量率无关。建立了用于电子束工业辐射加工的吸收剂量常规刻度方法。最后给出了测量静电加速器1.5MeV、电子迴旋加速器6.9MeV电子束在有机玻璃中深部剂量分布的实例。 相似文献
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研制了β参考辐射系统,它是由740MBq的~(147)Pm β源、74MBq和740MBq的~(90)Sr ~(90)Y β源、整平过滤器、源夹、源架、源测距杆、快门、控制器和β剂量仪校准架组成。带有整平过滤器的740MBq~(147)Pm β源和74MBq~(90)Sr ~(90)Y β参考辐射和不带整平过滤器的740MBq~(90)Sr ~(90)Y β参考辐射,分别在20cm、30cm和30cm距离处,剩余最大能量分别为0.14MeV、1.98MeV和2.18 MeV,组织吸收剂量率D(0.07)分别为1.547 mGy/h(1996 相似文献
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等效剂量的准确测定是进行地质样品热释光年龄测定的关键。采用不同辐照间隔增量测量泥石流物质标样,测得的等效剂量值是不同的,说明辐照剂量增量对泥石流物质样品等效剂量值存在影响。测试选用已知等效剂量为30 Gy的泥石流标样,按不同的辐照剂量增量进行等效剂量测定。2.5Gy/min的β源(90Sr-90Y)辐照剂量增量分别选用1、2、4、6 min时,测得的等效剂量分别为19.3、22.3、26.4、23.0 Gy;8 Gy/min的β源(90Sr-90Y)辐照剂量增量分别选用0.5、1、1.5、2 min时,测得的等效剂量分别为17.6、19.6、25.3、15.6 Gy。研究表明:对于30 Gy的泥石流标样,剂量率为2.5 Gy/s的β源(90Sr-90Y)测定泥石流物质时最适合的辐照剂量增量为4 min。剂量率为8 Gy/s的β源(90Sr-90Y)测定泥石流物质时最适合的辐照剂量增量为1.5 min。 相似文献
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In this paper, we used ESR dating method to measure the accumulative dose of the fossil teeth samples, which are contemporaneous with the Peking-Man. The internal annual dose rate of samples are got by neutron activation analysis and the environmental annual dose rate by highly sensitive TL dosimeters to be embedded in cave deposits in the site. The results of ESR dating are corresponded with the dating results obtained by U-series, FT, TL and paleomagnetic stratigraphical methods on the 3rd, 4th, 7th and 10th layers. Calculation of using different models, the close-equilibrium model, the linear uranium accumulation model and radon loss-linear uranium accumulation model, for travertine, deer teeth and rhinoceros tooth, we obtained the age of the First Peking- Man in the nth layer is 578 ka and gave ages of other layers, from the 1st to the 13th layer in Peking- Man site. 相似文献
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热释光断代中的年辐射剂量 总被引:1,自引:0,他引:1
李虎侯 《核电子学与探测技术》1988,(6)
本文讨论了热释光断代中的年辐射剂量,指出了环境辐射的正确概念,归纳了作者所采用的测定年辐射剂量方法及其效果。此外,对射气的散逸进行了讨论并叙述其测定方法,还考虑了宇宙辐射的影响。 相似文献
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对样品进行光晒退处理后测定热释光(TL)强度,得到TL断代结果。实验表明记年累积起点消楚,回零完全的标本是TL断代理想的测试对象。光晒退校正可获得可靠的TL断代结果,但河流沙土等地质标本在记年累积不太明确时将导致测年结果不准确。 相似文献
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Study on fine quartz pre-dose techniques 总被引:1,自引:0,他引:1
When using the pre-dose technique in ceramic dating,it is essential to add a calibration dose and to eliminate the background dose.For doing this measurement the sample requires multiple activation following multiple administration of a test dose to induce simulated “ancient” thermoluminescence(TL).However,the procedures introduce many factors that are difficultly corrected.This paper compares existing two kinds of measurement procedures and proposes a new procedure involving single activation following a single test dose administration.AN experiment using the single activation procedure is carried out with natural fine quartz where the results obtained exhibit only 0.07 relative error.It appears that this new procedure increases the precision of the ancient TL measurement by about 0.04 and 0.11 over those of existing two kinds of procedures.In addition this method can give realistic values in TL dating for relatively “young” samples aged tens to hundreds of yesrs where the standard high temperature TL method is relatively insensitive. 相似文献
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《核技术(英文版)》2016,(1):71-74
A general model for skeletal dosimetry in mice is presented. Geometrical constructs were made for four general regions in the mouse skeleton, and dose factors for90 Sr and90Y were calculated using the MCNP Monte Carlo transport code. Then, an overall skeletal dose factor for the whole skeleton was derived based on the individual values and the fraction of the total skeleton that they were assumed to represent. The whole skeleton average values were 1.56 9 10-11Gy/dis for90 Sr and 1.74 9 10-11Gy/dis for90 Y. 相似文献