Over the years we’ve seen several reports of criminals inserting foreign objects in Halloween candy. For that reason we use x-rays to make sure the candy our kids collect is safe for consumption. This year we decided to offer this service to the whole community. If you’d like to have you kid’s candy inspected with x-rays, please come by our facility in San Marcos this Sunday, November 1, from 9AM to 11AM. We’re located at 253 Pawnee St., San Marcos, CA. If you like more information, feel free to contact us here. This is not only an opportunity to check candy for foreign objects, but also a chance to show your kids how x-rays work. We look forward to seeing you this Sunday!
To give you an idea of what we can see if x-rays, check these images of what an innocent Snickers or Reese’s Peanut Butter Cup can hide!
Halloween candy x-ray: Snickers bar with needle
Halloween candy x-ray: Reese’s Peanut Butter Cup with razor blade
Although both examples are simulated, I can’t imagine finding these objects in my kids’ bowl of candy like other parents have! Here’s an example of the x-ray of the whole bowl showing the needle and the razor blade.
Before we get into the details of what we can and cannot see inside our kids’ candy, let’s review how x-ray imaging works. A special source located underneath the candy produces x-ray photons (x-rays photons are similar to visible light photons, but they vibrate at different frequencies) that travel thru the candy and reach a special sensor located on top of the candy. Unlike visible light, these x-ray photons travel go thru matter. However, we can tune the energy of the x-rays so they stop at some heavy materials (like metals), thus creating a shadow on the sensor. Now imagine we collect a bunch of these x-rays and create a image based on the density of the material they are travelling thru. Like you can see in the above image, the heavy parts of the candy are darker than the light parts of the candy. The metal foreign objects can be seen because they stop almost all x-rays, thus creating a very dark profile of the object (see the needle and the razor blade). What’s really cool is that we can also see the peanuts inside the Snickers bar and little air bubbles inside the Reese’s Peanut Butter Cup! What we can’t see, however, include materials that don’t cast a shadow with the x-ray light. That includes poisons, paper, aluminum, plastic, and other light materials. Like everything in life, technology can’t replace good judgement. X-rays can help us some things, but not absolutely everything a criminal might decide to insert in a candy.