FIELD EXPERIENCE WITH A PORTABLE K-EDGE DENSITOMETER
The portable K-edge densitometer developed by the Los Alamos National Laboratory was used by Euratom in a number of in-field applications. The objective of these field trials was to check the instrument's performance, its ease of use and its compatibility with plant operational procedures. The instrument was used by inspectors to measure Pu product solutions of reprocessing plants with Pu concentrations ranging from about 10g/ltr to about 370g/ltr. On average the differences between measured and declared values was of the order of 2% for concentrations larger than 100 g/ltr. In separate experiments the stability and reproducibility of the instrument was checked. The possible existence of a concentration dependent calibration constant was examined and has resulted in some proposals for improvements to the instrument and the operational procedures to be used. They will be described in detail in the paper. Another aspect looked at was the effect of changing hardware components and sources (different PMCA, different Ge detector, use of new as opposed to old sources) on the value of the calibration constant and on the performance of the instrument. One of the recommendations is to use 2 solid reference samples to derive the calibration constant K and the precise value of Io(Co)/Io(Se) (theoretical intensity ratio of the two sources without sample) at headquarters. Some other practical recommendations and feedback obtained from operators will be given too.
Bibliographic Reference: INTERNATIONAL SYMPOSIUM ON NUCLEAR MATERIAL SAFEGUARDS, WIEN (AUSTRIA), NOV. 10-14, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32971 ORA
Availability: Can be ordered online
Record Number: 1989125057500 / Last updated on: 1987-11-01
Available languages: en