IAEA-465

€180.00
Producing Laboratory: RML
Vendor: IAEA
Availability: In stock
Baltic Sea Sediment

A total mass of 225 kg wet sediment was sampled by box corer (20 cm × 20 cm) on 26 August 2012, at 82 m depth in the Baltic Sea (59° 34.91’ N, 23° 37.61’ E). The sediment sample was first air-dried to 108 kg and subsequently freeze-dried yielding 60 kg of dry sediment. The sample was then ground into powder using a micronisation technique. The powder was then homogenised by mixing in a nitrogen atmosphere, then bottled and sealed in polyethylene flasks (50 ± 1) g units and coded as IAEA-465. A total of 960 bottles were produced. All bottles were sterilised at 28 kGy (60Co) in an irradiation facility.  

 

Radionuclide

Certified value⁽ᵃ⁾

[Bq kg⁻¹]

Expanded Uncertainty⁽ᵇ⁾

[Bq kg⁻¹] 

Half-life[¹]

40K   

1072 

84 

1.2504(30)x109 years 

137Cs   

89.7 

4.1 

30.05(8) years 

210Pb‡,   

163 

17 

22.23(12) years 

210Po 

164 

18 

138.3763(17) days 

226Ra  

51.6 

5.2 

1600(7) years 

228Ra#   

64.4 

5.5 

5.75(4) years 

228Th+ 

64.4 

5.9 

1.9126(9) years 

232Th   

64.4 

5.4 

14.02(6)x109 years 

234U   

86.2 

6.8 

2.455(6)x105 years 

235U   

3.89 

0.31 

704(1)x106 years 

238U   

86.4 

6.9 

4.468(5)x109 years 

238Pu   

0.07 

0.01 

87.74(3) years 

239/240Pu   

2.17 

0.16 

- 

241Am   

0.99 

0.15 

432.6(6) years 

 

(a) Certified values are calculated from the accepted data sets, obtained by a different laboratory using a method of choice following ISO Guide 35 [2]. 

(b) The uncertainty is expressed as an expanded uncertainty using a coverage factor k = 2 estimated in accordance with the JCGM 100:2008 [3] and ISO Guide 35 [2]. 

 

References:

[Ref. 1] BNM – CEA/LABORATOIRE NATIONAL HENRI BECQUEREL, Table de Radionucleides,   

http://www.nucleide.org/DDEP_WG/DDEPdata.htm (date accessed 2021-09-16) 

 

[Ref. 2] INTERNATIONAL ORGANIZATION FOR STANDARDIZATION, Reference materials — Guidance for characterization and assessment of homogeneity and stability, ISO Guide 35: 2017, ISO, Geneva (2017). 

 

[Ref. 3] JOINT COMMITTEE FOR GUIDES IN METROLOGY (JCGM), Evaluation of Measurement data - Guide to the Expression of Uncertainty in Measurement, JCGM 100:2008 (GUM 1995 with minor corrections), (2008). https://www.bipm.org/documents/20126/2071204/JCGM_100_2008_E.pdf/cb0ef43f-baa5-11cf-3f85-4dcd86f77bd6 (date accessed 2021-09-17) 

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