中子放射化分析法應用於作物體中微量無機成分之定量

Studies on the Neutron Activation Analysis of Inorganic Minor Elements in Plants

以國立清華大學原子爐為中子照射源，應用非破壞放射化分析法，從事作物體中微量無機成分之定量，目的在發展此一方法，提供國內農業研究分析工作之運用。1.Mn之定量，以照射5分鍾，冷卻1小時為適當。2.定量Na及K時，以照射30分鍾，冷卻24小時為宜。3.同一試樣可行重覆照射，供各元素定量之用。4.分析柑桔葉片所得結果，顯示Mn及Na積聚於葉尖部分，而K則以葉柄及前葉部分含量較多，此一現象何因，有待進一步探討。

For the purpose of developing the non-destructive analysis for agriculture research in Taiwan, the reactor (Swimming-pool type, 1MW, 2~4×1012 thermal neutrons/cm^2/sec.) owned by National Tsing Hwa University was employed as the neutron source, The results suggest that; 1. For Mn determination, it is better to choice 5 min. irradiation time and 1 hour cooling. 2, For Na and K determination, it is better to choice 30 min. irradiation time and 24 hours cooling. 3. The used sample can be reused to determine other contents else. 4. In citrus leaves: according to the analysed results, Mn and Na were accumulated in the tip of leaf blade, while K was accumulated in the front part of leaf especilly in the leaf stalk.