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Ionization smoke detectors use americium as a source of alpha particles. Alpha particles from the americium source ionize air molecules. This makes some particles positively charged and some negatively charged.Ionization smoke detectors use americium as a source of alpha particles. Alpha particles from the americium source ionize air molecules. This makes some particles positively charged and some negatively charged.09-Aug-2021
How is radiation used in smoke detectors?
An isotope of americium which emits alpha particles is used in smoke alarms. Alpha radiation ionises the air and this allows a small current to flow between two electrodes. Alpha is weakly penetrating so smoke stops it, the current drops and the alarm goes off.
Why is beta and gamma radiation not used in smoke detectors?
(c) The smoke alarm would not work with a radiation source that emits beta or gamma radiation. Explain why. Most of the beta and gamma radiation would penetrate smoke and no change in the count rate would be detected.
Are gamma rays radioactive?
The penetrating power of gamma rays has many applications. However, while gamma rays penetrate many materials, this does not make them radioactive. The three radionuclides that are by far the most useful are cobalt-60, caesium-137, technetium-99m and americium-241.
What type of radiation is used in radiotherapy?
Radiation therapy uses high-energy particles or waves, such as x-rays, gamma rays, electron beams, or protons, to destroy or damage cancer cells. Your cells normally grow and divide to form new cells. But cancer cells grow and divide faster than most normal cells.
How do smoke detectors use gamma rays?
0:004:21How Radiation Works using Americium 241, Alpha ParticlesYouTube
What is beta radiation used for?
Beta radiation is used for tracers and monitoring the thickness of materials. Doctors may use radioactive chemicals called tracers for medical imaging. Certain chemicals concentrate in different damaged or diseased parts of the body, and the radiation concentrates with it.
What are the 7 types of radiation?
The electromagnetic spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency. The common designations are radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV) light, X-rays and gamma-rays.
What types of radiation are there?
There are four major types of radiation: alpha, beta, neutrons, and electromagnetic waves such as gamma rays. They differ in mass, energy and how deeply they penetrate people and objects. The first is an alpha particle.
What are the 4 types of radiation?
There are four major types of radiation: alpha, beta, neutrons, and electromagnetic waves such as gamma rays. They differ in mass, energy and how deeply they penetrate people and objects. The first is an alpha particle.
