A STUDY ON THE SAMPLE PREPARATION TECHNIQUES TO IMPROVE VARLATION ANALYSIS OF ENVIRONMENTAL RADIOACTIVITIES IN AOMORI PREFECTURE

我研究了samoie制备技术，开发了环境放射性的变化分析，^<14>C和氚。在<@D114@>D1C定年中，苯是由收集的样品经过几个化学反应合成的。由于样品的制备需要大量的努力，我们提出了另一种快速的工艺，即碳化的样品样品直接与熔化的金属锂反应，生产硫化锂。虽然气化样品生成乙炔气的产率明显较低，平均为52.5(]SY.+- .[)1.5%，但在连续的过程中，乙炔合成苯的产率达到90%以上。常规方法制备的样品的D1C年龄与转换方法制备的样品的D1C年龄在年龄变化范围内一致，对应的统计误差为10。由于该方法不包含燃烧和随后的碳化过程，因此样品制备相当缩短。这一结果已发表在《放射性同位素》杂志上。47岁的3号,1998年)。最近，环境水样样品中的氚浓度有时显示1 Bq/1或更低的值，这接近所使用的闪烁计数系统的检测极限。为了测量低氚浓度，我们研制了一种采用固体聚合物电解膜电解的氚富集装置。在水体积缩减系数为10的情况下，氚的回收率达到80%以上。本装置在对设备进行改进后，将用于降水、沿海海水等环境水样的富集。除上述研究外，我们还发表了一篇关于青森县六所町地区农产品和海产品的碳含量为^<14>的论文。我们还在一个会议上报告了从青森县东部地区收集的环境水样中的氚浓度。

I studied samoie preparation techniques to develop the variation analysis of the environmental radioactivities, ^<14>C and tritium.In <@D114@>D1C dating, benzene is synthesized from collected samoles via severai chemical reactions.Since a great deal of efforts is required to the sample preparation, we proposed an another rapid process where the carbonized samples remples reacted to melted lithium metal directly to produze lithium zarbide .Although the yield generating acetylene gas from cardonized samoles was apparenyly low, 52.5(]SY.+-。[)1.5% on average, the yield synthesizing benzene from acetylene was 90% or more in the successive process.<@D114@>D1C ages for the samoles prepared by the conventional method were agreed to those for the same sample prepared by the converitional method within the age variation corresponding to the statistical error of 1o.Since this method does not contain combustion and the following carbonating process, the sample preparation is fairly shortened.This result has been publishrd on RADIOISOTOPES(vol.47, NO.3,1998).Recently tritium concentrations in environmental water samples somples sometimes show a vaiue of 1 Bq/1 or lower which is near the detection limit of the scintillation counting system used.To measure low tritium concentration, we developed a tritium enrichment device which employs electrolysis using solid polymer electrolytic film.The obtained tritium recovery factor was 80% or more even at the water volume reduction factor of 10.This device will be used to enrich environmental water samples such as precipitation, coastal seawater and so on, after adding some improvements to the device.Excepting above mentioned study, we have published a paper concerning to ^<14>C specific of farm products and marine products collected from the Rokkasho Area in Aomori prefecture.We have also reported on a conference about tritium concentrations in environmental waters samples collected from the east area of Aomori prefecture.