CAJ | 학술논문

在鸡饲料中添加一定量的铱化合物(NH4)2IrCl6)，喂养14d，用中子活化法分析所产蛋的铱含量。结果在蛋壳、蛋清、蛋黄中均发现了铱元素，其中蛋黄为最高。且它们的铱含量都随鸡饲养天数的增加呈上升趋势，到7、8d后稳定在一定范围；当停止喂养含铱饲料后，铱含量迅速下降。另外，铱从食物到蛋壳的比率大约为万分之七。这一结果为铱有可能从食物链进入恐龙体内，并通过代谢作用沉积到蛋壳中的推断提供了科学依据。
재계사료중첨가일정량적의화합물(NH4)2IrCl6)，위양14d，용중자활화법분석소산단적의함량。결과재단각、단청、단황중균발현료의원소，기중단황위최고。차타 문적의함량도수계사양천수적증가정상승추세，도7、8d후은정재일정범위；당정지위양함의사료후，의함량신속하강。령외，의종식물도단각적비솔대약위만분지칠。저 일결과위의유가능종식물련진입공룡체내，병통과대사작용침적도단각중적추단제공료과학의거。
Several hens were fed by adding ammonium chloroiridate into their foage. After two weeks, the Ir concentration in three fractions (eggshell , albumen, egg yolk) of their eggs were measured by INAA. Ir was found in all of the three parts. However, the highest concentration of Ir was found in the egg yolk fraction, which was about 10 times higher than that in the eggshell and albumen. Moreover, the longer the Ir-containing feedstuff w as used, the higher the Ir concentration in the egg fractions was. After 78 days feeding, it kept stable. On the other hand, as soon as adding the Ir-containing additives were stopped, the Ir concentration in the egg fractions fell down quickly. The experimental results indicated that the rati o from the feedstuff to the eggshell via gastrointestinal pathway to be about 0.07 percent. The new result might be beneficial to explain the iridiu m-enriched dinosaur eggshell fossils and to interpret the origin of the mass extinct event of dinosaur occurred at the end of Cretaceous.