Measurement of the Excited Energies Identified in 42Ca using the ROSPHERE Gamma-ray Arrays.

Abstract

Excited energy states totalling 11 in number identified to be associated with the 42Ca were detected via the ROSPHERE gamma-ray array detectors of IFIN-HH Bucharest from a 28Si(18O, 2p2n), where a multi-particle of 2 protons and 2 neutrons were evaporated in a fusion reaction. The excited energies were identified using γ-ray coincidences. All detected gamma energies (γ) recorded were compared with various literatures from NNDC and this shows an excellent agreement with each and the results are presented together with their calculated relative intensities.

Validation of Tritium Calibration Curve in CIEMAT/NIST Activity Measurement Using Non Linear Least Squared Fittings and Calculations of the Half-Life and Decay Constant of Potassium-40

“…By applying the QIPs obtained from measured samples to equation (1) the tracer efficiencies are obtained. Similarly, by applying the obtained tracer efficiencies to equation (10), the corresponding radionuclide efficiencies are obtained. (iv) Conversion of the efficiency of the radionuclide so determined and the measured count rate (R n ) in CMP to the activity of the radionuclide [14].…”

“…The choice of both Tritium and Potassium-40 ( 40 K) in this study was because of the following reasons: (i) tritium suitability for use in CIEMAT/NIST method as a pure beta emitting radionuclide (ii) significance of Potassium-40 ( 40 K) in radiometric age determination [4] which depends solidly on accurately determined half-life and decay constants [7]. 40 K is a naturally occurring radionuclide aside uranium and thorium [8], whose decay to Calcium-40 (one of the stable isotopes of Calcium) [9,10] and especially to Argon-40 (figure 1) is widely used in radiometric dating [4]. Unfortunately, uncertainty in half-life and decay constant values have limited present day radiometric dating [4].…”