A Craigieburn nurse caught with child abuse material is behind bars, but he'll only do two months of an 18-month sentence before he walks out.

Muhammad Bin Suradi, 35, was a perioperative nurse at Northern Health and had been promoted to a management role when federal police raided his Craigieburn home in December last year. It's understood federal police found thousands of images and videos across his laptops, hard drives and phones, and the court heard he sourced the material on the dark web.