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Unprotected experiments in the U.S. in 1896 with an early X-ray tube ( Crookes tube ), when the dangers of radiation were largely unknown. [1] The history of radiation protection begins at the turn of the 19th and 20th centuries with the realization that ionizing radiation from natural and artificial sources can have harmful effects on living ...
The sound of a geiger counter. A Geiger counter (/ ˈɡaɪɡər /, GY-gər; [ 1 ] also known as a Geiger–Müller counter or G-M counter) is an electronic instrument used for detecting and measuring ionizing radiation. It is widely used in applications such as radiation dosimetry, radiological protection, experimental physics and the nuclear ...
Cathode-ray tube. The only visible differences are the single electron gun, the uniform white phosphor coating, and the lack of a shadow mask. A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. [2]
The Therac-25 was designed as a machine controlled by a computer, with some safety mechanisms switched from hardware to software as a result. AECL decided not to duplicate some safety mechanisms, and reused modules and code routines from the Therac-20 for the Therac-25. The first prototype of the Therac-25 was built in 1976 and was put on the ...
A PA-302 General Precision Laboratories (GPL) kinescope (c.1950–1955). Its movie film camera, bolted to the top of the cabinet, used Kodak optics.. Kinescope / ˈ k ɪ n ɪ s k oʊ p /, shortened to kine / ˈ k ɪ n iː /, also known as telerecording in Britain, is a recording of a television program on motion picture film, directly through a lens focused on the screen of a video monitor.
In 2005, the Chinese government created a mass surveillance system called Skynet. The government revealed Skynet's existence in 2013, by which time the network included over 20 million cameras. In addition to monitoring the general public, cameras were installed outside mosques in the Xinjiang region, temples in Tibet, and the homes of ...
An X-ray generator generally contains an X-ray tube to produce the X-rays. Possibly, radioisotopes can also be used to generate X-rays. [1]An X-ray tube is a simple vacuum tube that contains a cathode, which directs a stream of electrons into a vacuum, and an anode, which collects the electrons and is made of tungsten to evacuate the heat generated by the collision.
One of the earliest electronic displays is the cathode-ray tube (CRT), which was first demonstrated in 1897 and made commercial in 1922. [1] The CRT consists of an electron gun that forms images by firing electrons onto a phosphor -coated screen. The earliest CRTs were monochrome and were used primarily in oscilloscopes and black and white ...