Photon emission probabilities per decay of 226Ra and 232Th in equilibrium with their daughter products

Study of radon exhalation from soil to ascertain the elevated levels of background radiation of Bangladesh

“…The containers were sealed tightly and wrapped with thick vinyl tapes around their screw necks. The samples were stored for four weeks to allow 226 Ra and 232 Th to reach in secular equilibrium with their respective daughters [7], then the samples were counted using a ptype coaxial high purity germanium (HPGe) detector of active volume 132 cc, relative efficiency 35% and resolution 1.8 keV (FWHM) at 1.33 MeV y-energy of ^Co coupled with PC based multichannel analyser (PCMCA). The y-ray energy regions selected for the corresponding radionuclides were 583 and 2614 keV of 208 T1, and 911 and 969 keV of 228 Ac for the determination of 224 Ra; 295 and 352 keV of 2l4 Pb and 609.3, 1120 and 1764.5 keV of 214 Bi for the determination of 226 Ra, and 1460 keV for 40 K [7,8].…”

Radiological risk analysis of sediment from Kutubdia island, Bangladesh due to natural and anthropogenic radionuclides

“…All the samples containers were sealed tightly with cap and wrapped with Te0lon and thick vinyl tapes inside and outside around their screw necks and 0inally air tightened with polythene pack. These sealed containers were then stored for a period of four weeks to allow for the attainment of secular equilibrium between the long lived 238 U and 232 Th and their short lived progeny (7,8) .…”

Evaluation of decay data of radium-226 and its daughters

“…The recommended values for the relative gamma-ray emission intensities are the weighted means of the data sets found in the literature dating from 1969 to 2004 [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], calculated using the LWEIGHT computer code [19]. When necessary the uncertainties quoted by the authors were increased to achieve The transition probabilities for all gamma-rays were calculated using the absolute gamma-ray emission intensities and the relevant internal conversion coefficients (ICCs).…”

“…Some measurements of X-ray data were be found in the literature for Ra-226 [6,17,29], Pb-214 [4,6] and Bi-214 [6]. In the case of Ra-226 (table 5), the recommended data and de Pinho values [29] are significantly greater than those measured by Delgado [17] and Schötzig [6]. De Pinho [29] used a Ra-226 source from which the descendants were removed.…”

“…De Pinho [29] used a Ra-226 source from which the descendants were removed. Since then, Delgado [17] and Schötzig [6] have carried out measurements with sources in equilibrium with their daughters.…”