Determination of Small Amounts of Carbon-14 in the Presence of Large Iodine-131 Activities, and an Experimental Estimation of the Specific Activities of (131I)-Iodotyrosines

Nature ◽  
1964 ◽  
Vol 201 (4919) ◽  
pp. 621-622 ◽  
Author(s):  
W. S. REITH ◽  
B. L. BROWN
Keyword(s):  
Carbon 14 ◽  
Experimental Estimation ◽  
Iodine 131 ◽  
Specific Activities

scholarly journals Analysis of the 40K levels in soil using gamma spectrometry

2005 ◽  
Vol 48 (spe2) ◽  
pp. 221-228 ◽  
Author(s):  
José Araújo dos Santos Júnior ◽  
Jorge João Ricardo Ferreira Cardoso ◽  
Cleomacio Miguel da Silva ◽  
Suêldo Vita Silveira ◽  
Romilton dos Santos Amaral
Keyword(s):  
Gamma Spectrometry ◽  
Absorbed Dose ◽  
Soil Samples ◽  
Spectrometry Method ◽  
Dose Rates ◽  
Elemental Concentrations ◽  
High Purity Germanium ◽  
Specific Activities ◽  
Potassium 40

Potassium-40 was determined in soil in an area with 40,000 m² situated in the western State of Pernambuco, Brazil. For radiometric measurements, the gamma spectrometry method with a high purity germanium (HPGe) detector was used. Sampling of 78 soil samples has been performed at intervals of 25 m. The specific activities of 40K were calculated based on the photopeak of 1.46 MeV. Values from 541 to 3,572 Bq kg-1 were obtained (mean of 1,827 Bq kg-1). These values allowed the determination of the elemental concentrations as well as the absorbed dose rates in air, 1 m above the ground. The values varied from 1.7 to 11.5% (mean of 6%) and from 23.4 to 154.3 nGy h-1 (mean of 79 nGy h-1), respectively.

Determination of Iodine-131 Specific Activity by Protein lodination

Nature ◽  
1966 ◽  
Vol 212 (5059) ◽  
pp. 285-286 ◽  
Author(s):  
J. S. GLOVER ◽  
B. P. SHEPHERD
Keyword(s):  
Specific Activity ◽  
Iodine 131
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