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186 Re : importance of X-ray measurements

186 Re : importance of X-ray measurements. M.M. Bé mmbe@cea.fr. Simplified Decay Scheme. 186 Re. EC 1.  1. 122 keV. 137 keV. g 122. EC 0. g 137. 186 W.  0. 186 Os. X K. X K. Available measured values. Following the beta minus transition P1:.

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186 Re : importance of X-ray measurements

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  1. 186Re : importance of X-ray measurements M.M. Bé mmbe@cea.fr

  2. Simplified Decay Scheme 186Re EC1 1 122 keV 137 keV g122 EC0 g137 186W 0 186Os XK XK

  3. Available measured values Following the beta minus transition P1: Following the Electron Capture EC1: Absolute values : Absolute values : P+ce = (1+T)  I 137 = P1= 21,68 (38) % P+ce = (1+T)  I122 = PEC1= 1,694 (25) %

  4. Decay Scheme 186Re EC1 1 122 keV 137 keV g122 EC0 g137 186W 0 186Os XK P122 P137 P122 + P137 + PEC0 + P0= 100

  5. X-ray intensity measurements • We have : • Two measured values of the W K X-ray intensity given relatively to the Ig137 line • And one absolute value • Then using the formula : • I(W KX) = With I(W KX) = 6,02 (8)% (Schönfeld, 1994) PEC1 = 1,694 (25) % PK, K, T from Tables K = 0,954 (4) PEC0 = 5,83 (11) %  P0 = 70,86 (40) %

  6. X-ray intensity influence The difference between the higher and the lower value is 0.5 %, it can be noted that these values of the electron capture probabilities are of importance for some users of the decay scheme data, for example when activity measurement of a solution is made by the mean of liquid scintillation counting because the electron capture decay events are more susceptible to ionization quenching effects. This is to point out this influence and importance of some values in the result of activity measurement.

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