Minimum Detectable Activity in gamma spectrometry and its use in low level activity measurements

Evaluation of heavy metals and radionuclides in fish and seafood products

“…Artificial radionuclide 137 Cs was detected in two samples (2.8 and 3.0 Bq kg -1 ) which belonged to the same species (European sprat) imported from two different countries (Estonia and Poland). According to Currie's method, minimum detectable activities (MDAs) of 226 Ra, 232 Th, 40 K and 137 Cs were 0.26, 0.34, 2.10 and 0.15 Bq kg -1 , respectively (Currie, 1968;Done and Ioan, 2016). Activity concentrations of 226 Ra and 232 Th were below MDAs in all samples.…”

Evaporation behavior of 233Pa in FLiBeZr molten salt

“…On studying the separation of 233 Pa from fission products, the minimum detectable activity (MDA) in units of Bq for some selected nuclides is calculated as follows eqn (2) : 23 where is the background count in the total-energy peak region of γ-rays; ε ( E ) is the devotion efficiency of ray energy E ; γ ( E ) is the branching ratio of ray energy E ; T is the measured live time.…”

Comparação entre diferentes metodologias para a determinação da atividade mínima detectável dos sistemas de dosimetria interna in vivo

“…The minimum detectable activity (MDA) is the lowest activity that can be reliably detected in a counting system under specific measurement conditions (1). This concept was developed by Lloyd Currie, 1968 (2) and has appeared frequently in the literature (3) such as the Health Physics Society N13.30 (4), ISO 11929 (5) and others (6,7)Usually, in vivo dosimetry laboratories, the MDA is important to be known the different counting systems and, for the main type of radionuclides of interest, aiming at the optimization of the internal monitoring process (8). The Internal Dosimetry Laboratory of the Nuclear Technology Development Center (LDI/CDTN) located in Belo Horizonte -MG, Brazil is contamination of workers of the Research and Production of Radiopharmaceuticals Unit (UPPR/ CDTN) involved in the production of 18 F-FDG.…”