Gasfilled

Gas-filled refers to devices, components, or structures that rely on a gas as the working medium, typically at a defined pressure. It is used to describe equipment where electrical, optical, or mechanical functions are achieved through gas properties, in contrast to vacuum or solid-state devices.

In radiation detection, gas-filled detectors use the ionization of gas by incident radiation to generate an electrical signal. Common types include ionization chambers, proportional counters, and Geiger–Müller tubes. Gas type, pressure, and electrode geometry influence sensitivity, energy response, and operating voltage. Gases such as argon, neon, xenon, and methane mixtures are commonly employed as counting media.

Gas-filled discharge tubes form light or electrical switching devices. Neon lamps and other gas discharge tubes produce characteristic colors through glow discharge, while gas discharge tubes are used in surge protection and timing circuits. Some display devices, such as nixie tubes, rely on gas-filled envelopes to produce visible numerals.

Gas-filled mechanical components such as gas springs or gas-filled dampers use compressed gas to provide resistance or return force. They are common in automotive suspensions, office chairs, and industrial equipment, offering smooth motion and adjustable damping.

Key considerations for gas-filled devices include the potential for gas leakage, aging due to contamination or chemical reactions, and safety concerns at high pressure or high voltage. Proper gas choice and sealed construction are essential for reliable, long-term operation.