The Radiation around Us / Mr. Denjiro’s Happy Energy! скачать в хорошем качестве

The Radiation around Us / Mr. Denjiro’s Happy Energy!

DENJIRO: First, take a look at this. I have a vacuum cleaner with some tissues attached to the tip as a filter. I’ve sucked in the air inside a room for an hour using this. I’ve taken off the filter, and now I’m going to put a radiation detector up to it. BOY: The reading is going up! DENJIRO: So what happened there? The reading went up because the vacuum cleaner gathered tiny particles in the air that emit radiation. Even if I move the device away from the filter… it’s still detecting a bit of radiation. This is because it’s picking up the tiny amount of radiation that comes from outer space, the air, and the ground. NARRATOR: A tiny amount of radiation can also be detected from wood ash, which is used as fertilizer. DENJIRO: Various forms of radiation exist around us, and they’re called “natural background radiation.” There are many kinds of radiation detectors as well. I have a few right here. The one I was using earlier is called a Geiger counter. This is a radiation detector that works just like a Geiger counter. I’m going to bring a radiation source up to it. This sound is caused by the radiation. This is the detector. In the center of it is a thin metal wire with a positive charge. On the outside is a transparent film that conducts electricity. This has a negative charge to it. There’s a high voltage in between, and when radiation enters, small discharges occur and create the sound that we heard. The Geiger counter was invented by Geiger and Müller in 1928. Isn’t it incredible that it can detect radiation with such a simple mechanism? I hope energy will bring you all happiness. Our magic word is "Happy Energy!”