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农业生物学中一般使用的示踪原子是半衰期在10天以上的~(14)C、~(32)P、~(45)Ca、~3H等中长寿命的放射性同位素(RI)、或~(15)N、~(13)C等稳定性同位素(SI)。然而,在植物的必需元素中,多数是半衰期在数日以内的短寿命RI。用原子反应堆制造的短寿命RI有相当多种类(~(99)Mo、~(64)Cu、~(42)K、~(24)Na等)已在市场上出售。但用回旋加速器制造的RI尚无市售,且利用也颇少。表1列出了可在农业生物学领域中推广应用的回旋加速器制造的短寿命RI,其中~(11)C在医学领域已获得很好的利用。本文主要介绍~(18)F和~(43)K的利用实例。
Tracer atoms commonly used in agricultural biology are long-lived radioactive isotopes (RI) of ~ (14) C, ~ (32) P, ~45 Ca, ~ 3H, etc. with a half- (15) N, ~ (13) C and other stable isotopes (SI). However, among the essential elements of plants, the majority are short-lived RIs with half-lives of less than a few days. There are quite a few types of short-lived RIs made using atomic reactors (~ (99) Mo, ~ (64) Cu, ~ (42) K, ~ (24) Na, etc.) which are already on the market. However, cyclotron RI has not been made on the market, and the utilization is also quite small. Table 1 lists the short-lived RIs manufactured by cyclotrons, which can be widely used in agricultural biology. Among them, ~ (11) C has been well used in the medical field. This article mainly introduces the use cases of ~ (18) F and ~ (43) K.