proportional counter การใช้

• The monitor consisted of 2 collimated argon proportional counters.
• A Helium-3 ( He-3 ) filled proportional counter is the most common epithermal and thermal neutron detector.
• The HPGSPC was also a gas scintillation proportional counter, operating at a high ( 5 atmospheres ) pressure.
• Proportional counters use a geometry with a thin positively charged anode wire in the center of a cylindrical chamber.
• It consisted of two slot collimators and a proportional counter, which were used to study the spectra of incident x-rays.
• At each point the transmitted X-rays are recorded with a detector such as a proportional counter or an avalanche photodiode.
• "' Sealed gas detectors "'are similar to the gas flow proportional counter, except that the gas does not flow through it.
• However, for discrimination between alpha and beta particles or provision of particle energy information, scintillation counters or proportional counters should be used.
• In the case of proportional counters, multiple creation of ion pairs occurs in the " ion drift " region near the cathode.
• The MECS contained three identical gas scintillation proportional counters operating in the 1.3 to 10 keV ( 208 to 1602 aJ ) range.
• Among them was a proportional counter, known as the Rossi counter, which measures the energy deposited by radiation in microscopic sites like cells.
• The US portion of the Apollo-Soyuz mission ( July 1975 ) carried a proportional counter system sensitive to 0.18-0.28 and 0.6-10.0 keV X-rays.
• Important innovations in this earlier work were the adaptation and development of the X-ray proportional counter with pulse-height discrimination for use with X-ray diffraction.
• Multiwire proportional counters or solid-state counters are often used as detection medium, because they provide signals with pulse heights proportional to the ionization strength.
• The gas can be sealed in the chamber, or can be changed continuously, in which case they are known as " gas-flow proportional counters ".
• For both the gas proportional counter and liquid scintillation counter, what is measured is the number of beta particles detected in a given time period.
• This is in distinction to the Geiger-M黮ler tube or the proportional counter whereby secondary electrons, and ultimately multiple avalanches, greatly amplify the original ion-current charge.
• Libby's method was soon superseded by gas proportional counters, which were less affected by bomb carbon ( the additional created by nuclear weapons testing ).
• In 1920, he generalized this idea to a cascaded voltage multiplier, and developed detection methods for charged particles ( proportional counter, British researchers discovered artificial radioactivity.
• From the use of the Gas Scintillation Proportional Counter ( GSPC ) on board EXOSAT, a catalog of iron lines from some 431 sources was made available.