Experimental investigation of mass efficiency curve for alpha radioactivity counting using a gas-proportional detector

Modeling of alpha mass-efficiency curve

“…13(a) and (b). The statistical 1s errors of the data points are less than 2% [5], and they are smaller than the apparent scatter of the data, which is caused primarily by the sample nonuniformities. For this reason, we applied Poisson weights (reciprocals of the efficiency values) to most of the fits.…”

“…[11]. cases, we calculated the ranges of a particles in the samples of evaporated water residues, based on the known chemical composition and moisture content [5]. The elemental ranges were taken from Ref.…”

“…To account for this effect, detector a efficiency is determined for various sample masses (so-called mass-efficiency curve). In a previous investigation [5], we studied experimentally the mass-efficiency curves for several a-emitting radionuclides in detail. In order to use the empirical mass-efficiency curves for assay of radionuclides, they have to be fitted with some function so that detector efficiency can be determined for a sample of given mass.…”

238U and total radioactivity in drinking waters in Van province, Turkey

“…Gross α and gross β detection is a simple and inexpensive technique, but is a very sensitive method to measure low levels of radioactivity for initial screening of radioactivity in environmental samples [15]. The gross analyses are generally made first to determine the total amount of radioactivity that is present.…”

Study on Gross-alpha Characteristics of Groundwater for Drinking in Korea

“…대부터 전알파 등 자연방사성물질에 대한 조사와 연구를 수행하고 있다 (USGS, 1962;Health Canada, 1968;Wrenn et al, 1975;Arvela et al, 1979;Hess et al, 1985;Troja et al, 1995;Salonen et al, 1997;Mkelinen et al, 1999;NHMRC, 2004;Semkow et al, 2004 ( 1) A : net alpha count rate C : alpha efficiency factor, read form graph of efficiency vs mg of water solid per cm 2 of planchet area V : volume of sample(mL) 2.22 : conversion factor from dpm/Ci (Table 3). 연구 지역 730개의 지하수는 50~400 m의 심 도를 보이는 암반 지하수라고 할 수 있으며, 이들 각각의 지질시대와 암석·광물에 따른 전알파 함량의 통계치는 참 고 문 헌…”