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Environmental radiochemical analysis V by Peter Warwick, Anthony Ware

By Peter Warwick, Anthony Ware

Incidents long ago have made scientists conscious of the necessity for exact equipment of radionuclide analyses for you to estimate the danger to the general public from published radioactivity. This booklet is an authoritative, up to date selection of learn contributions provided on the twelfth foreign Symposium on Environmental Radiochemical research. Representing the paintings of major scientists from around the globe it provides info on radiochemical research, dimension of radioactivity, certainly happening radioactive fabrics, radioactively infected land, destiny of radionuclides in common and engineered environments and behavior and research of radionuclides in radioactive wastes. This crucial paintings may be a key reference for graduates and pros who paintings throughout fields regarding analytical chemistry, environmental technology and know-how, and waste disposal

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0 Bq of Sr-85 from the standard Sr-85 solution were added to each milk aliquot for the Sr yield determination and allowed to equilibrate with the milk for at least one hour prior to the Sr extraction. The Sr was extracted with a modified version of a previously described procedure12. (The modifications deal with the separation of Ba nuclides from the sample by barium chromate precipitation at pH value 6,5). Details of the modified procedure are available on request from the main author). 4 were used for the evaluation with UncertRadio.

5 to 970 keV. 5 to 10 keV Region B: 10 to 225 keV Region C: 225 to 630 keV. 5 Measurement of Standard Efficiencies To evaluate the sample spectra, the programme UncertRadio requires for each energy region the efficiencies of all radionuclides (Sr-85, Sr-89, Sr-90 and Y-90) as well as the background count rates) with minimum measurement uncertainties. Therefore all measurements of the standard vials were continued until the count statistical error in all regions was less than 1 %. Net count rates were corrected for decay between activity reference date and start of measurement and for the shorter lived radionuclides Sr-85, Sr89 and Y-90 for decay during the measurement period.

Again, the sampling uncertainty is much greater for the ex situ measurements. 5%, a result of low measurement variation on the scale of the 2 m measurement spacing. However, the analytical uncertainty for the in situ measurements is double that for ex situ. 1% (Area 1) to 22 % (Area 2). The results from these surveys have two important implications. First, they suggest that contamination by 137Cs is often highly heterogeneous on the scale of a few centimetres. This will strongly affect individual ex situ measurements, but will have a lesser impact on in situ measurements.

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