An Air shower is an extensive (many kilometres wide) cascade of ionized particles and electromagnetic radiation produced in the atmosphere when a primarycosmic ray (i.e. one of extraterrestrial origin) enters our atmosphere. The term cascade means that the incident particle, which could be a proton, a nucleus, an electron, or (rarely) a positron strikes an atom in the air so as to produce many high energy ions (secondaries), which in turn create more, and so on. The original particle having arrived with high energy and hence velocity near the speed of light, the products of the collisions tend also to move generally downward, while to some extent spreading sidewise. The overall effect, when the energy of the primary is high enough, is to produce a widespread flash of light due to the Cerenkov effect, and to excitation of air molecules. This can be detected with arrays of mirrors and photocells. The actual arrival of the cascade of particles can also be detected in many cases, also generally with detectors based on the Cerenkov effect. Electromagnetic radiation or EM radiation is a combination (cross product) of oscillating electric and magnetic fields perpendicular to each other, moving through space as a wave, effectively transporting energy and momentum. ... Atmosphere may refer to: a celestial body atmosphere, e. ... Cosmic rays can loosely be defined as energetic particles originating outside of the Earth. ... Atmosphere may refer to: a celestial body atmosphere, e. ... For alternative meanings see proton (disambiguation). ... Plural: nuclei In chemistry and physics, the nucleus (atomic nucleus) is the collection of protons and neutrons in the center of an atom that carries the bulk of the atoms mass and positive charge. ... Properties The electron (also called negatron, commonly represented as e−) is a subatomic particle. ... A positron is the antiparticle of the electron. ... Energy is a fundamental quantity that every physical system possesses; it allows us to predict how much work the system could be made to do, or how much heat it can exchange. ... Energy is a fundamental quantity that every physical system possesses; it allows us to predict how much work the system could be made to do, or how much heat it can exchange. ... This article is about velocity in physics. ... Cherenkov effect in a swimming pool nuclear reactor. ... Energy is a fundamental quantity that every physical system possesses; it allows us to predict how much work the system could be made to do, or how much heat it can exchange. ... Cherenkov effect at the [http://www. ... In science, a molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. ... A photoresistor is an electronic component whose resistance decreases with increasing incident light intensity. ... Cherenkov effect at the [http://www. ...
The term cascade means that the incident particle, which could be a proton, a nucleus, an electron, or (rarely) a positron strikes an atom in the air so as to produce many high energy ions (secondaries), which in turn create more, and so on.
The overall effect, when the energy of the primary is high enough, is to produce a widespread flash of light due to the Cerenkov effect, and to excitation of airmolecules.
The airshowerÂ’s function is to remove unwanted allergenic and microbial particles from personnel prior to their entry into the clean area from a change room, washroom, or ante-room.
The airvelocity impinging upon the worker in the airshower must be at least 40 mph (3,520 to 4,000 feet per minute) for an extended period or 60-65 mph (5,280 feet per minute) for a shorter period.
The air supplied to the airshower nozzles must be finely filtered to prevent personnel from being impinged with contaminants during the cleaning cycle.
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