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Determination of Al, Ca, V and Mn by INAA: Application to the Reference Material IAEA-395 “Urban Dust”

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Abstract

Instrumental NAA based on short-lived radionuclides implies high initial total count rates which change appreciably over the counting period. This in turn necessitates corrections for three negative biases: losses due to differences in counting time between samples and standards; pile-up losses, and (residual) influence of dead-time. The procedure is demonstrated for the determination of Al, Ca, V and Mn in the IAEA Reference Material 395 “Urban Dust”. The obtained data are in good agreement with the reference values for this material. By limiting the total relative dead-time to ≤25%, statistical uncertainties are below 5%.

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Abbreviations

A :

Net counting result in a peak

A p :

Net counting result in the pulser peak

B :

Compton background under a peak

C o :

Count rate in a peak at the beginning of the measurement

D o :

Total dead-time fraction at the beginning of the measurement

D t3 :

Total dead-time fraction at timet 3 after the beginning of the measurement

f p :

Correction factor for pile-up

f τ :

Residual los factor due to dead-time

N :

Number of channels in a peak

s:

Suffix denoting “standard”

T 1/2 :

Half-life of the radionuclide of interest s or min

(T 1/2)′:

Average half-life of the record γ-ray spectrum. (A function oft 3). s or min

t 1 :

Irradiation time. s or min

t 2 :

Decay time. s or min

t 3 :

Preset counting time. s or min

t′ 3 :

Extended counting time. s or min

x :

Suffix denoting “sample”

λ:

Decay constant of the radionuclide of interest. s−1 or min−1

λ':

Average decay constant of the recorded γ-ray spectrum (A function oft 3) s−1 or min−1

(σ A )rel :

Relative standard deviation in an experimental value ofA

References

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  3. B. J. T. NIEUWENDIJK, J. R. W. WOITTIEZ, H. A. DAS, J. Radioanal. Nucl. Chem., 89 (1985) 465.

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  4. A. FAANHOF, H. A. DAS, J. Radioanal. Chem., 54 (1979) 289 and 303.

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Authors and Affiliations

  1. BATAN-PPTN, Jalan Tamansari 71, 40132, Bandung, Indonesia)

    A. Hidayat

  2. Laboratory for Analytical Chemistry, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, (The Netherlands)

    H. A. Das

Authors
  1. A. Hidayat
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  2. H. A. Das
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Hidayat, A., Das, H.A. Determination of Al, Ca, V and Mn by INAA: Application to the Reference Material IAEA-395 “Urban Dust”. Journal of Radioanalytical and Nuclear Chemistry, Articles 207, 145–151 (1996). https://doi.org/10.1007/BF02036534

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  • DOI: https://doi.org/10.1007/BF02036534

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