
Nowadays, security checkpoints are very common, and such devices are available at security checkpoints in railway stations, bus stations, airports, subways and other places. The theory is that through X-ray fluoroscopy, the items in the suitcase will be displayed on the screen in the form of images, to identify suspicious items and timely eliminate possible dangers. And the curtain on the security device, you’ll notice that it’s not just a regular rubber curtain. It’s used to block x-rays, which is…