原有同位素测厚仪存在着设备落后，监测系统功能不完善，测量精度不高，以及标定方法繁琐等不足。
The old isotope gauge has a lot of shortcoming, such as the unadvanced equipment, the imperfect monitoring system, the fussy calibration method and so on.
尽管我国好多矿床已经测得了大量同位素年龄资料，但这决不等于这些年龄数据均能标定成矿过程中某一地质事件发生的时代。
A lot of isotopic age data of many significant ore deposits in China have been obtained, but a certain geologic event in the mineralization process can not be marked by them.
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