People are constantly exposed to low levels of naturally occurring radiation called background radiation. Background radiation comes from cosmic radiation and from radioactive elements in the air, water, and ground. Cosmic radiation is concentrated at the poles by the earth’s magnetic field and is attenuated by the atmosphere. Thus, exposure is greater for people living at high latitudes, at high altitudes, or both and during airplane flights. Terrestrial sources of external radiation exposure are primarily due to the presence of radioactive elements with half-lives comparable to the age of the earth (~4.5 billion years). In particular, uranium (238U) and thorium (232Th) along with several dozen of their radioactive progeny and a radioactive isotope of potassium (40K) are present in many rocks and minerals. Small quantities of these radionuclides are in the food, water, and air and thus contribute to internal exposure as these radionuclides are invariably incorporated into the body. The majority of the dose from internally incorporated radionuclides is from radioisotopes of carbon (14C) and potassium (40K), and because these and other elements (stable and radioactive forms) are constantly replenished in the body by ingestion and inhalation, there are approximately 7,000 atoms undergoing radioactive decay each second.
Internal exposure from the inhalation of radioactive isotopes of the noble gas radon (222Rn and 220Rn), which are also formed from the Uranium (238U) decay series, accounts for the largest portion (73%) of the US population's average per capita naturally occurring radiation dose. Cosmic radiation accounts for 11%, radioactive elements in the body for 9%, and external terrestrial radiation for 7%. In the US, people receive an average effective dose of about 3 millisieverts (mSv)/yr from natural sources (range ~0.5 to 20 mSv/yr). However, in some parts of the world, people receive > 50 mSv/yr. The doses from natural background radiation are far too low
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Fabric Filters (also called baghouses and bagfilters) are air pollution control devices that remove particulate matter from a gas stream by passing the dirty air through a layer of cloth. The particulate matter deposits on the cloth surface and the clean air passes through. Of all the air pollution control technologies, fabric filters are the predominant particulate removal device used in industrial processes today. Fabric Filter bags
How to Make POWERFUL Rocket out of 200 L | 55 Gallon Barrel
Do not try to repeat any actions shown in this video! It is is very dangerous! Safety is #1 priority! Just watch this video and enjoy :)
In this video I show you how to make powerful rocket out of 200 L / 55 gallon barrel. We used сalcium carbide and water. The reaction of calcium carbide with water, producing acetylene and calcium hydroxide CaC2 + 2 H2O → C2H2 + Ca(OH)2. Acetylene is very
flammable gas. Even a small spark is enough to set it on fire.
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Miniature motors of cable materials, electronic components, paralon, gas lighters and splats
Miniature motor dari bahan kabel listrik,korek gas,paralon,komponen elektronik dan spull jahit
Miniature motors used cable,gas lighters,paralon,electronic component and spull
Texas Outdoor Patio Center has been proudly serving the DFW and Texas in helping clients find the best grilling equipment. We know every client has a budget in mind so let us find you the best equipment that fits your culinary needs!
Here is it again! A lady drives off her car with the gas pump nozzle still attached to the car. What to say, yet another blonde behind the wheels!