Investigation of impurity deposition in a code trap of a sodium loop

The distribution of impurities enriched in a cold trap is found to be inhomogeneous. The latter's main function is the purification of the loop sodium in respect to oxygen, but several other compounds or elements are also deposited there. A cold trap is found to have no purification effect in respect to lead and tin. The particle size gives an explanation of the purification effect of the filter in the sampling device of the sodium trap. Manganese is not deposited on the walls of the cold trap