Abstract
The Finnish Nuclear Verification organization (FINUVE) performed a field trial in Kazakhstan in order to test sampling and analytical methods developed in Finland. The effect of pre-filtration was studied using two samplers, one with and one without pre-filtration
located next to each other. The sampling period was one year from April 2000 to April 2001. Dust, 7Be, 137Cs, U and Pu-isotopes were measured from the filters. Radiochemical separation techniques were developed for the separation of U, and Pu from the air filters
and from each other. γ-spectrometry was used for the measurement of 7Be and 137Cs, α-spectrometry and liquid scintillation spectrometry for 238Pu, 239,240Pu, 241Pu and ICP-MS for total uranium and the 235U/238U-ratio. Tracer studies were performed to study the effectiveness of the chemical separation.
Certified reference materials were analyzed to validate the accuracy of the measurement techniques. U and Pu concentrations of soil samples from same area in Kazakhstan were also analyzed.
The variation in the content of solid material and the 7Be concentrations are rather high. 137Cs can only be detected in a part of the samples. The total uranium varies considerably between the samples, while the 235U/238U-ratio can be determined with a precision of ±2–10%. The ratio 238Pu/ 239,240Pu is a more sensitive indicator for plutonium than the 239,240Pu concentration.
located next to each other. The sampling period was one year from April 2000 to April 2001. Dust, 7Be, 137Cs, U and Pu-isotopes were measured from the filters. Radiochemical separation techniques were developed for the separation of U, and Pu from the air filters
and from each other. γ-spectrometry was used for the measurement of 7Be and 137Cs, α-spectrometry and liquid scintillation spectrometry for 238Pu, 239,240Pu, 241Pu and ICP-MS for total uranium and the 235U/238U-ratio. Tracer studies were performed to study the effectiveness of the chemical separation.
Certified reference materials were analyzed to validate the accuracy of the measurement techniques. U and Pu concentrations of soil samples from same area in Kazakhstan were also analyzed.
The variation in the content of solid material and the 7Be concentrations are rather high. 137Cs can only be detected in a part of the samples. The total uranium varies considerably between the samples, while the 235U/238U-ratio can be determined with a precision of ±2–10%. The ratio 238Pu/ 239,240Pu is a more sensitive indicator for plutonium than the 239,240Pu concentration.
| Original language | English |
|---|---|
| Place of Publication | Helsinki |
| Publisher | Säteilyturvakeskus |
| Number of pages | 15 |
| ISBN (Print) | 951-712-562-3, 951-712-563-1 |
| Publication status | Published - 2002 |
| MoE publication type | D4 Published development or research report or study |
Publication series
| Series | STUK-YTO-TR |
|---|---|
| Volume | 184 |
| ISSN | 0785-9325 |
Keywords
- WAES
- safeguards
- air filter samples
- U
- 235U/238U
- 238Pu
- 239
- 240Pu
- Pu isotope ratios