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No, intracavitary radiation does not make people radioactive. The radioactive source used for treatment is placed inside the body temporarily, and once the treatment is completed, the source is removed. The patient does not become radioactive from this procedure.
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Radium, being radioactive, will irradiate and activate some things placed near a sample. The element radium in its "natural" form is an alpha particle emitter, and things that get hit by an alpha particle have a chance of undergoing nuclear transformation. An alpha particle, which is emitted by a 226Ra atom when it decays, is a helium-4 nucleus. It's composed of two protons and two neutrons. This is a "heavy hitter" as regards particulate radiation. It won't travel far, even in air, because it is too massive and it "runs into stuff" in scattering reactions because of its size. But when it reacts with a nucleus, things happen. That's how some materials near a radium source become radioactive.
The particles emitted by a radioactive substance can change other atoms, and in some cases, they will turn into radioactive isotopes.
When food is placed inside the microwave oven, the microwave released will 'agitate' the water molecules in the food, which causes heat to be produced, which then cooks the food.
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5 minutes in glass pan
This phenomenon is rare, non obligatory. For example beryllium irradiated with alpha particles from radium emit neutrons.
Radioactive materials emit dangerous radiation; most of this will be blocked by a box of lead.
When certain plates are placed in the microwave, they can get hot because they are made of materials that absorb microwave radiation and convert it into heat. This can happen with plates that contain metals or certain types of ceramics that are not microwave-safe.
Yes, it is safe to microwave a banana as long as it is peeled and placed on a microwave-safe dish. Microwaving a banana can soften it and make it easier to use in recipes or eat as a snack.
Answers.com says it is a microwave amplifier in which a Gunn oscillator functions as a negative-resistance amplifier when placed across the terminals of a microwave source.