A device for the attenuation of the light flux, in particular for the attenuation of the scintillations microsecond for the measurement of the activity of the radioactive isotopes

摘要

P device for the attenuation of the light flux comprising a measurement chamber containing one vial of measurement of the light source, that is optically coupled with the photoelectron multipliers of the light detectors. / p & & p & the device is equipped with a cylindrical spring 6 placed between the photomultipliers 3 and the bottle for measuring 2, which spring operates in the form of the adjustable diaphragm. Measurement of the activity of the radioactive isotopes. / p