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引言在用P~(32)的示踪研究中,由于其半衰期较短(14.3天),在农业实验设计中往往要求观察持续时间较长,放射性同位素用量又要低至基本上对作物不发生射线的生物效应,因此在进行物理测量时,样本中放射性物质的含量极少,从而需要进行低水平测量.在用C(14)的示踪研究中,由于要进行同化产物的分离,放射性同位素的用量也要低至基本上对作物不发生射线的生物效应,因此亦需进行低水平测量。此外,低水平测量还能节省放射性同位素的用量,从而减少实验过程中所产生的废物,井能降低操作过程中对安全防护的要求。
INTRODUCTION In tracer studies using P ~ (32), because of its short half-life (14.3 days), it is often desirable in agricultural experimentation to observe longer durations and lower levels of radioisotopes to essentially not affect the crop The biological effects of the radiation, therefore, the physical content of radioactive material in the sample is very small, which requires a low level of measurement.In the C (14) tracer studies, due to the separation of assimilation products, radioisotopes The dosage is also so low that it basically does not produce the biological effects of radiation on the crop and therefore low level measurements are also required. In addition, low-level measurements save the amount of radioactive isotopes used, reducing the amount of waste generated during the experiment and reducing the need for safeguards during operation.