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A correction for dead-time losses in γ-ray spectrometry for a mixture of short-lived radionuclides

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Abstract

A simple procedure for the correction of residual dead-time losses in γ-ray spectrometry of mixtures of short-lived radionuclides is given. It is based on the value of the total deadtime at the beginning of the measurement and three constants which are characteristics for a given matrix. The application to the instrumental neutron activation analysis of fluorine and sodium in bone is given as an exaple.

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Abbreviations

A:

Result of measurement in counts [−]

A0 :

Corrected value of A [−]

C0 :

Count-rate under photopeak at t=0 [min−1]

Ct :

Count-rate under photopeak at time t [min−1]

\(\overline {C_o } \) :

True total count-rate at t=0 [min−1]

Ct :

True total count-rate at time t [−]

\(\overline {C_t^r } \) :

Observed total count-rate at time t [min−1]

D0 :

Total dead-time at t=0 [−]

Dt :

Total dead-time at time t [−]

fτ :

Influence of dead-time without automatic correction [−]

f′τ :

Influence of dead-time with automatic correction [−]

p:

Constant from the empirical formula for\(\overline C _t \overline {\tau _t } \) [−]

Tm :

Preset counting-time [min]

T′m :

Extended counting-time [min]

t:

Time [min]

\(\left. \begin{gathered} \alpha \hfill \\ \beta \hfill \\ \end{gathered} \right\}\) :

Constants in the empirical formula for\(\overline C _t \overline {\tau _t } \) [min−1]

λ:

Decay-constant [min−1]

\(\overline {\tau _o } \) :

Average dead-time per pulse at t=0 [min]

τt :

Average dead-time per pulse at time t [min]

Tw :

Decay time between the end of the irradiation and the beginning of the measurement [min]

References

  1. H. A. DAS, J. ZONDERHUIS, Nucl. Techn., 10 (1971) 328.

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  2. J. M. GOUMAN, et al., Radiochem. Radioanal. Letters, 21 (1975) 61.

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Authors and Affiliations

  1. ECN Netherlands Energy Research Foundation Research Centre, Petten (NH), The Netherlands

    J. R. W. Woittiez & J. Zonderhuis

  2. Laboratory of Analytical Chemistry, University of Amsterdam, The Netherlands

    A. Faanhof & H. A. Das

Authors
  1. J. R. W. Woittiez
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  2. J. Zonderhuis
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  3. A. Faanhof
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  4. H. A. Das
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Woittiez, J.R.W., Zonderhuis, J., Faanhof, A. et al. A correction for dead-time losses in γ-ray spectrometry for a mixture of short-lived radionuclides. J. Radioanal. Chem. 53, 191–201 (1979). https://doi.org/10.1007/BF02517919

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  • DOI: https://doi.org/10.1007/BF02517919

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