These days, however, the main source of ionising radiation for most people is neither fallout from bombs nor radiotherapy; it is dental X-rays.

然而，现今影响大多数人的离射的主要源头既不是的射不是放射疗法，而是牙科X光。

Ironically, because past research studying the after-effects of exposure to things like atom bombs and radiation treatments for cancer suggests the most important environmental risk factor for meningiomas is ionising radiation.

讽刺的是，对人体暴露于类似射和癌症放射疗法后续影响的研究显示，产生脑膜瘤的最主要的环境风险因素是离射。