BIPM - proportional counters

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Proportional counters

Summary

Setting up an ionization chamber to be calibrated against the BIPM primary standard

Setting up a low-energy x-ray transfer chamber to compare with the BIPM standard

Primary standard for medium-energy x-radiation

Setting up a transfer chamber for radiation protection level quantities

NMI transfer chamber in a waterproof envelope inside the BIPM water phantom

Ionization chambers of the International Reference System (SIR)

The SIR experimental facilities in their new location

Efficiency curve of the SIR

Ge spectrometers

Proportional counters

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Two beta detectors are available for primary measurements by the coincidence method. Above is shown the proportional counter (pill-box type) working at atmospheric pressure, and on the right, the proportional counter working at pressures up to 2 MPa. Both are gas-flow counters. The beta , gamma and beta - gamma coincidence counts are either transferred from scalers to a computer through an RS-232 connection or directly obtained using scalers on a PC-card driven under LabVIEW.

Proportional counters can also be used to make measurements of alpha emitters such as ²³⁸Pu.

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