Absolute activity measurements with the windowless 4-Pi-CsI(Tl)-sandwich spectrometer
The windowless 4pi-CsI(Tl)-sandwich spectrometer consists of two scintillation crystals sandwiching radioactive sources deposited on thin plastic foils. This configuration has a solid angle very close to 4pi sr. The detectors are sensitive to charged particles with energies greater than 15 keV and measure photons of 15 to 100 keV with a probability greater than 98 %. Disintegration rates of samples of radionuclides with complex decay modes can be determined directly from the measured count rates with uncertainties below 0.3 %. Radionuclide solutions of 57Co, 109Cd, 125I, 152Eu and 192Ir were standardised, partly in the framework of international comparisons. A detailed description of the spectrometer and the measurement procedure is given.
Bibliographic Reference: Paper presented: ICRM '93, Teddington (GB), June 7-11, 1993
Availability: Available from (1) as Paper EN 37531 ORA
Record Number: 199310859 / Last updated on: 1994-11-29
Original language: en
Available languages: en