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The STORM project was designed in order to study aerosol deposition and resuspension phenomena in nuclear reactor components during severe accidents. The representative aerosols selected for the experiments are the non-radioactive isotopes of the chemical species of greatest interest: the insoluble SnO(2) and a mixture of SnO(2) with the soluble CsOH. In order to gain information on the actual mass and chemical composition of the deposits it is necessary to perform post-test analysis of samples withdrawn at different times during the experiment. Aerosol collection devices, such a filters and impactors, are used to allow post-test analysis of the deposited and/or resuspended particles. An energy dispersive X-ray fluorescence (EDXRF) spectrometer with a 300 mCi (241)Am source and a Si(Li) solid state detector currently used for the quantitative analysis of all collected material. The EDXRF results of impactors containing only SnO(2) aerosols were found to be in excellent agreement with the microbalance analysis. However, first attempts to calibrate the Sn-Cs system showed that there is a strong absorption effect and that it is impossible to make calibration standards using CsOH solution and SnO(2) powder. In the future, calibration standards will be produced using CsNO(3) and SnO(2) powders in order to achieve homogeneity of the samples.

Additional information

Authors: DILARA P, JRC Ispra (IT);BOPP A, JRC Ispra (IT);HUMMEL R, JRC Ispra (IT);DE SANTI G, JRC Ispra (IT)
Bibliographic Reference: Paper presented: EDXRS-98, Bologna (IT), June 7-12, 1998
Availability: Available from (1) as Paper EN 14666 ORA
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