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・ Lungotevere Prati
・ Lungotevere Raffaello Sanzio
・ Lungotevere Ripa
・ Lungotevere Salvo D'Acquisto
・ Lungotevere Testaccio
・ Lungotevere Tor di Nona
・ Lungotevere Vaticano
・ Lungotevere Vittorio Gassman
・ Lungoț River
・ Lung cancer surgery
・ Lung cancer susceptibility
・ Lung cancer vaccine
・ Lung Center of the Philippines
・ Lung Chen
・ Lung Cheung Road
Lung counter
・ Lung dragon
・ Lung float test
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・ Lung Fong
・ Lung Fu Shan Country Park
・ Lung Fung Restaurant
・ Lung fung soup
・ Lung Ha Wan
・ Lung India
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・ Lung Khung
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・ Lung Kong Tin Yee Association
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Lung counter : ウィキペディア英語版
Lung counter

A Lung counter is a system consisting of a radiation detector, or detectors, and associated electronics that is used to measure radiation emitted from radioactive material that has been inhaled by a person and is sufficiently insoluble as to remain in the lung for weeks, months or years.
Often, such a system is housed in a low background counting chamber whose thick walls will be made of low-background steel (~20 cm thick) and will be lined with ~1 cm of lead, then perhaps thin layers of cadmium, or tin, with a final layer of copper. The purpose of the lead, cadmium (or tin) and copper is to reduce the background in the low energy region of a gamma spectrum (typically less than 200 keV)
== Calibration ==

As a lung counter is primarily measuring radioactive materials that emit low energy gamma rays or x-rays, the phantom used to calibrate the system must be anthropometric. An example of such a phantom is the Lawrence Livermore National Laboratory Torso Phantom.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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