Pocket sensitivity calibration of multicollector mass spectrometers

A method is described for the calibration of multicollector mass spectrometers. The instruments are used for nuclear application and equipped with 9 fixed collector pockets. To obtain all required information two solutions have been prepared one for uranium containing U-233, U-235, U-236 and U-238 with an approximate composition of 2:1:1:1 and the other for plutonium containing Pu-239, Pu-240, Pu-242 and Pu-244 with an approximate composition of 3:1:3:2. The spectrum was shifted by one and two mass units on both sides of the normal position and the ion intensities collected. These data have been used for the calculation of the relative sensitivity of the pockets involved. (orig.)