求助og11一个解释

A technique originally developed for detecting air pollutants, called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it, is finding uses in medicine, archaeology, and criminology.

og:解释说called protin-induced X-ray emission should be placed next to a technique and should not be set off by commas; relative clause introduced by which incorrectly and illogically modifies emission.
定语从句which为什么要去掉逗号，我没看懂，求助~~

人家是说

called protin-induced X-ray emission 应该放在a technique 旁边，同时不能和a technique 用逗号隔开。

和那个which没啥关系。。。。。