The Geiger Counter / Mr. Denjiro's Happy Energy! скачать в хорошем качестве

The Geiger Counter / Mr. Denjiro's Happy Energy!

DENJIRO: I'm wearing an armor made of chain mail. I'm standing on an insulator stand and I'm grounded, so it is safe for my body to be in contact with the electrical discharge emitting from this machine. In fact, there is a way to detect radiation with an electrical discharge. Let's see how we can do this. I'm running high-voltage currents through a metal stick and a piece of thin wire that are just far enough away that there is no discharge. When we bring an ordinary rock up to it, nothing happens. However, when I do the same with a rock like uraninite that emits radiation... Did you see that discharge? It is hard for electrical currents to pass through air, so discharge doesn't occur too much. But when radiation hits the molecules in the air, it becomes easier for electricity to pass through. That's why we see discharge. A Geiger counter uses this principle to detect radiation. This right here is a detector called a G-M tube. It has a current running through it. When I bring a uraninite rock close to the G-M tube, it reacts like this. Let's see the voltage applied to the G-M tube using plant seeds. I put the seeds in oil and apply voltage. The seeds have lined up. This shows that there is a current running between the center of the tube and its perimeter. When radiation enters, this causes small discharges. The Geiger counter counts the number of discharges inside the G-M tube to measure radiation. Did you know that you can detect radiation from everyday items? One example is wood ash that is used as fertilizer. When you bring it close to the Geiger counter... the device measures the beta and gamma rays that are being emitted from something called potassium-40. The Geiger counter will react to items like wood ash and potash fertilizer, which have high levels of potassium. I hope energy will bring you all happiness. Our magic word is "Happy Energy!"