I may go to hell in a bucket, but at least I'm enjoying the ride. You only need them when you have a quick-action valve (such as a dishwasher or washing machine). You can use Lowes or Depot liquid fillers. Simple air chambers made of an additional piece of pipe with a lid will eventually fill up and be useless.
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Ionization chambers are preferred for high radiation dose rates because they have no “downtime”, a phenomenon that affects the accuracy of the Geiger-Mueller tube at high dose rates. Small ventilated air ionization chambers with a volume of 0.01 to 0.3 cm3 are considered suitable for measuring field parameters up to 2 cm × 2 cm.
The ionization chamber is the simplest type of gas-filled radiation detector and is widely used for the detection and measurement of certain types of ionizing radiation, including x-rays, gamma rays, and beta particles. The ionization chamber, also known as an ion chamber, is an electrical device that detects various types of ionizing radiation.
A well type ionization chamber is composed of a cylinder containing the gas (nitrogen, argon or gas mixture) under a given pressure and electrodes that will be used to collect electrical charges. Some 16,000 Micro Strip gas chambers like this one will be used in the CMS tracking detector.