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The ionization chamber is a gas-filled radiation detector, and is widely used for the detection and measurement of nuclear particles and certain types of ionizing radiation; X-rays, γ rays, and β particles.

It's a way of expressing how much a detector's material affects a beam as if that material were replaced with an equivalent thickness of water, the reference medium used in radiotherapy dosimetry. A thinner water-equivalent thickness means the chamber perturbs the beam less, which matters for accurate in-beam dose measurement.

Gap spacing (the distance between the chamber's electrodes) affects sensitivity, collection efficiency, and response time. Smaller gaps generally improve time resolution and reduce recombination effects at high dose rates; the right choice depends on your beam intensity and the measurement you need. Contact us with your application details and we can help you pick.

It refers to a chamber's ability to maintain accurate, stable performance after being exposed to significant accumulated radiation dose over its operating lifetime, without degrading materials or drifting response.