ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

What is Radiation

Updated on March 21, 2011

In physics, the term radiation is generally used to indicate a set of phenomena characterized by the transport of energy in space. Typical examples of radiation are light and heat.

A feature common to almost all types of radiation (light, heat, etc..) Is the transfer of energy to matter. This "transfer" of energy can be explained simplistically, whereas the kinetic energy of the "particles" that make up its radiation (photons), the particle, once coming into contact with the material he can transfer the kinetic energy to subject, usually in the form of heat and light. A particular type of radiation consists of electromagnetic waves, characterized by a constant speed in a vacuum, finite, equal to about 299792 km / s (rounded value is often in the 3.0 x 108 m / s), denoted by c, by a particular frequency and its wavelength, indicated by the symbol λ (lambda). The frequency f is defined as the number of wavelengths that pass in a second for a given point in space, and it is possible to obtain numerically considering the following relationship:


This relationship is always valid because c is a constant. So the higher the value of the wave frequency the lower the wavelength of the same, then the speed of light is constant for any electromagnetic radiation that propagates in a vacuum. Light is electromagnetic radiation with wavelengths ranging from about 380 nm to about 760 nm violet red.

The absorption of energy by matter can cause a local increase in temperature, which is exploited in the case of solar heating by the light of the sun If the energy of the incident radiation on matter is sufficient to ionize the , is called ionizing radiation.

If the ionizing radiation involves a biological tissue can cause biological damage, acting on the DNA and prevents them from reproducing correctly. The supply of humans by ionizing radiation occurs through the external or internal. There is talk of external radiation exposure or when the source of radiation remains outside the human body, such as what happened to the liquidators of Chernobyl '. There is talk of internal exposure when the source of radiation is introduced into the human body, such as what happened to Alexander Litvinenko died that although chemical poisoning by Polonium has undergone a remarkable radiation of the same.

A source of atomic radiation resulting from the instability and / or nuclear elements. Elements in nature that this instability can be traced easily on the periodic table of elements, and in particular, are all elements that have atomic number (Z) equal to or more than 84 (Z> = 84), ie from polonium. There are also other isotopes of elements with atomic number less than that are radioactive and are produced by man, the most common case is produced by the 60Co 59Co nuclear reactor by the addition of a neutron. The 60Co, with a beta decay becomes 60Ni and emits two photons of energy 1.17 and 1.33 MeV, which are used in various fields such as medicine (cobalt bomb) or industrial (food processing, materials , sterilizations ...).

In general, the transformation of these elements into other elements is more stable by emitting α or β rays also accompanied by the emission of γ rays. The elements that have the characteristics that are called radioactive elements and the process of radiation is called radioactive decay.



    0 of 8192 characters used
    Post Comment

    No comments yet.


    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at:

    Show Details
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the or domains, for performance and efficiency reasons. (Privacy Policy)
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)
    ClickscoThis is a data management platform studying reader behavior (Privacy Policy)