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Стр. 1238
A method for distinguishing between modern and old samples of lead has been used to analyze certain works of art . The basis of the method is the detection of radioactive lead - 210 , which decays with a 22 - year half - life when it is ...
A method for distinguishing between modern and old samples of lead has been used to analyze certain works of art . The basis of the method is the detection of radioactive lead - 210 , which decays with a 22 - year half - life when it is ...
Стр. 1239
Processed material : lead metal or lead compounds . Concentration ( dpm per gram of Pb ) Date of Description and Poo10 at manufacsource date of ture P0210 Ra 920 manufacture Sample No. Separation factort U.S. ) M - 7 Lead metal ( U.S. ) ...
Processed material : lead metal or lead compounds . Concentration ( dpm per gram of Pb ) Date of Description and Poo10 at manufacsource date of ture P0210 Ra 920 manufacture Sample No. Separation factort U.S. ) M - 7 Lead metal ( U.S. ) ...
Стр. 1241
The distribution of observed initial polonium - 210 concentrations , corrected for decay where appropriate . of over 30 samples of impure white lead ( those in Tables 3-5 with less than 50 percent lead ) were calculated and found to be ...
The distribution of observed initial polonium - 210 concentrations , corrected for decay where appropriate . of over 30 samples of impure white lead ( those in Tables 3-5 with less than 50 percent lead ) were calculated and found to be ...
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acid activity addition American animals appear applications associated biology cells chairman chemical Chemistry comets complete concentration containing Department determined discussion effect electron experiments fact field function gametophytes given human important increase indicated Institute interest International laboratory lead less major material means measured mechanism membrane ment method minutes Model nature normal Notes observed obtained occur operation organic percent period phase physics placed position possible preparation present Press problems produced protein range reaction recent record References response samples School Science scientific scientists separation similar single solution space specific structure studies suggest Table temperature theory tion United University values volume write York