He worked in a X-ray department for the last 10 years.

英訳に間違いが有れば正してください。

彼は10年の間、X線検査部門で働いていた。
He worked in a X-ray department for the last 10 years.

答え a X-rayをan X-rayにする

He worked in an X-ray department for the last 10 years.