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physics class 10 icse
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1) The cathode ray tube (CRT) is a vacuum tube containing one or more electron guns (a source of directed electrons) and a fluorescent screenused to view images. It has a means to accelerate and deflect the electron beam onto the fluorescent screen to create the images.
2) Gamma rays have a range of uses,
Gamma rays are used for killing things, for example in teletherapy they are used to kill cancer tissue by delivering a radiation dose to it. In another form of radiotherapy (brachotherapy)both gamma and beta particles tend to damage the cancer tissue to make it die thus treating the patient.
Gamma rays are used in some imaging systems such as gamma camera, radiography using a point source of a gamma emitter and in PET imaging.
Gamma rays are sometimes used to induce chemical change in a object in radiation processing.
Gamma rays are sometimes used in nuclear gauges for things like level sensing in industrial processes.
Beta is used in some medical treatments, also some beta sources are used in radiothermal generators. The Soviets used to make Sr-90 based RTGs for use in lighthouses and other remote devices.
Some low energy beta sources are used to build detectors for gas chromatgraphy machines (ECD) which are known as “electron capture detectors”. These have been of great use for the measurement of traces of halogen compounds, for example the measurement of freon in air has been done with this type of detector.
Alpha sources are used to ionize air, in a range of gadgets which include antistatic products and also in smoke detectors. The antistatic gadgets include polonium-210 containing brushes, paint sprayers and other things. The Soviet block tended to use plutonium in smoke detectors while the western block uses americium-241 as the alpha emitter.
Some alpha sources such as plutonium-238 are used in RTGs for space applications and in the old days in heart pacemakers.
2) Gamma rays have a range of uses,
Gamma rays are used for killing things, for example in teletherapy they are used to kill cancer tissue by delivering a radiation dose to it. In another form of radiotherapy (brachotherapy)both gamma and beta particles tend to damage the cancer tissue to make it die thus treating the patient.
Gamma rays are used in some imaging systems such as gamma camera, radiography using a point source of a gamma emitter and in PET imaging.
Gamma rays are sometimes used to induce chemical change in a object in radiation processing.
Gamma rays are sometimes used in nuclear gauges for things like level sensing in industrial processes.
Beta is used in some medical treatments, also some beta sources are used in radiothermal generators. The Soviets used to make Sr-90 based RTGs for use in lighthouses and other remote devices.
Some low energy beta sources are used to build detectors for gas chromatgraphy machines (ECD) which are known as “electron capture detectors”. These have been of great use for the measurement of traces of halogen compounds, for example the measurement of freon in air has been done with this type of detector.
Alpha sources are used to ionize air, in a range of gadgets which include antistatic products and also in smoke detectors. The antistatic gadgets include polonium-210 containing brushes, paint sprayers and other things. The Soviet block tended to use plutonium in smoke detectors while the western block uses americium-241 as the alpha emitter.
Some alpha sources such as plutonium-238 are used in RTGs for space applications and in the old days in heart pacemakers.
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