Let's look at the construction of the tube. The Geiger-Müller (GM) tube is essentially a cylinder with a "wire" down the middle for an anode, and the inside of the cylindrical housing as the cathode. It's got some gas in it, and the type of gas will vary a bit from tube to tube and what is desired in the design. The "end" has a "window" in it made of thin glass or possibly mica. This window "lets in" the radiation while sealing the tube and providing a minimum amount of shielding that might "block" radiation, particularly alpha and beta radiation. Recall that alpha particles are helium-4 nuclei, and they can't penetrate a sheet of paper. Beta particles are high energy electrons, or possibly positrons, which can be stopped by a sheet of aluminum foil. You can't detect them if you block them. The way it works is as the radiation passes through the GM tube, it leaves an ionized "trail" in the gas behind it. This is primary ionization. The high voltage across the gas causes the ions to be accelerated toward the appropriately charged element. Positive charges move toward the cathode, and negative charges (electrons) move toward the anode. The movement of these charges ionizes other gas atoms, called secondary ionization, and the total effect is to create a current avalanche. With the movement of these charges and the accompanying current "spike" or "jolt" set off by the high voltage, we'll observe a "pulse" that the supporting circuitry in the detector can "see" and a "hit" or "count" is recorded by the Geiger counter. Gamma rays are penetrating types of (electromagnetic) radiation. They blast through the window and they ionize the heck out of the gas inside. It is basically the cumulative effect of all this ionization that creates sufficient ions to initiate the current avalanche that cause the counter to "pulse" electrically. The gamma rays have a field day zapping their way through the cylinder and creating lots ions to create a "click" or a count. In contrast, alpha and beta particles will not penetrate very far into the tube because of their limited ability to do so. This means that the current avalanche is more confined to the "front" of the tube. The superior penetrating power of the gamma rays means that their current avalanche includes a lot of volume deeper in the tube, or more "in the middle" than at the end of the tube, like the particulate radiation. Links can be found below for more information.
Sentence: A Seismograph is a machine used to measure the severity of earthquakes.
Compression waves happen when particles within a wave are close together rather than spread out. Anything that has a sound is a compression wave that can be heard.
Because inside of the glass bulb lies a vacuum that prevents the bulb from burning out within a few seconds rather than several thousand hours.
A general guide is that the turbine should be a minimum of 30 feet above any trees or buildings within 300 to 500 feet.
SI is used worldwide. As scientists, many of their ideas are going to be shared with colleagues within the US and overseas. Therefore, it's easier to use SI in order to keep the conversions to a minimum.
Yes, alcohol can be detected in urinalysis. If you have the presence of ETG in your urine it shows that you have consumed alcohol sometime within the past four days.
nope, that amount of cocaine should leave your system within a week if you drink alot of water :D
No. 14 days after sex at the earliest pregnancy can be detected.
A tornado warning means that either a tornado or funnel cloud has been spotted to detected or that strong rotation that could lead to a tornado has been detected within a thunderstorm.
Before you begin fueling your boat, you should make sure your fire extinguisher is within reach. This is a basic safety precaution. It is also best to fuel your boat on a ramp rather than in the water.
You should look for consistancy in compression readings rather than individual numbers-- all cylinders should be within 10% of each other i.e. 150 ok with 135-165
No. I don't believe any planets have been detected outside of our Galaxy. Within our Galaxy, planets are detected by inference not visual techniques. See link for lists of known extrasolar planets
It should be eaten within 24 hours.
It can. just go to a doctor and ask for a Pregnancy test, and you'll have immediate results.
Curry should be stored refrigerated and used within a few days.
The compression in each cylinder should be within 10% of the others. 125 to 140 is rather poor, below that it probably won't start.
Radio labeling is incorporation of a radioactive isotope within a molecule , so the compound can be detected using radioactivity detection techniques.