Results 141 to 150 of about 716 (178)

Thoron standard source

Applied Radiation and Isotopes, 2019
Thoron (220Rn) has been identified as a possible health concern in specific places such as monazite processing plants and (rare-earth) mines. The short half-life of thoron (55.8 s) makes thoron calibration sources and thoron chambers less common than the corresponding radon (222Rn) ones.
Robert, Lindsay, Elmughera, Elhag, Robert J, de Meijer, Joash N, Ongori, Peane P, Maleka   +4 more
openaire   +2 more sources

Measurement of Thoron in the Breath

Physics in Medicine and Biology, 1958
A method of measuring the thoron content of the breath of patients who have been injected with colloidal thorium dioxide as a radiological contrast medium, is described. The levels are sufficiently high for the decay of the thoron to be observed using only four litres of breath, being in the range 250 to 2000 μμc per litre, and they can be used to ...
J, RUNDO, A H, WARD, P G, JENSEN
openaire   +2 more sources

Simulation of thoron and thoron progeny concentrations in the indoor environment

Journal of Building Physics, 2011
Thoron ( 220 Rn) exhalation from building materials has become increasingly recognized as a potential source for radiation exposure in domestic houses. However, contrary to radon ( 222 Rn), little is known about the exposure to thoron and its short ...
Govert de With, Peter de Jong
openaire   +1 more source

Development of a primary thoron activity standard for the calibration of thoron measurement instruments

Radiation Protection Dosimetry, 2015
The LNHB and IRSN are working on a reference atmosphere for thoron ((220)Rn) instrument calibration. The LNHB, as the national metrology institute for activity measurement in France, has to create a new thoron reference standard in order to estimate with accuracy the thoron concentration of a reference atmosphere.
Sabot, Benoît, Pierre, S., Cassette, P., Michielsen, N., Bondiguel, S.   +4 more
openaire   +2 more sources

Deposition and spatial variation of thoron decay products in a thoron experimental house using the Direct Thoron Progeny Sensors

Journal of Radiological Protection, 2017
Experiments have been carried out using the deposition-based Direct Thoron Progeny Sensors (DTPS) in a thoron experimental house. The objective was to study the thoron decay product characteristics such as the deposition velocities, spatial variability and dependence on aerosol particle concentrations.
MISHRA, R, JOSHI, M, MEISENBERG, O, GIERL, S, PRAJITH, R, KANSE, SD, ROUT, R, SAPRA, BK, MAYYA, YS, TSCHIERSCH, J   +9 more
openaire   +4 more sources

Preparation and characterisation of ceramic-based thoron sources for thoron calibration chamber

Radiation Protection Dosimetry, 2015
The aim of this study is to explore the correlations between the properties of the source's material and the thoron flux produced. This means a complex procedure that involves morphological characterisation (the determination of specific surface area and pore size distribution) and thoron emanation and exhalation measurements as well. In this work, the
A, Csordás, F, Fábián, M, Horváth, M, Hegedűs, J, Somlai, T, Kovács   +5 more
openaire   +2 more sources

INADEQUACY OF THORON DOSE CALCULATIONS FROM THORON PROGENY MEASUREMENT ALONE

Radiation Protection Dosimetry, 2016
To determine the dose received by thoron (220Rn) domestically, conventional methods measure the activity concentration of thoron progeny only (namely the 212Pb atoms) and calculate the dose by using a set of conversion factors. This may be due to the measurement of progeny being simpler since it is longer lived and will be evenly spread throughout the ...
D, Lane-Smith, F K, Wong
openaire   +2 more sources

Optimization of the thoron progeny compensation system of a thoron calibration chamber

Journal of Radioanalytical and Nuclear Chemistry, 2020
The long-term stability and homogeneity of thoron progeny are key to the performance of a thoron calibration chamber, which is vital to quality assurance in measuring thoron progeny. It is difficult to build a stable and high level of thoron progeny because the half-life of 212Pb is long. Thus, a stable and efficient compensation system is necessary to
Weiwei Li, Qingzhi Zhou, Zhengzhong He, Guiyuan Li, Wei Liu   +4 more
openaire   +1 more source

Thoron measurements in Hungary

Radiation Protection Dosimetry, 2010
In this study, several Hungarian dwellings and working places were surveyed using passive radon- and thoron-measuring devices (Radopot(®) and Raduet(®)) from 2003 to 2008. The detectors were placed 15-30 cm from the wall throughout the 1- to 3-month period. In dwellings, the presence of thoron, ∼100 Bq m(-3), was detected almost in all cases, ; however,
openaire   +2 more sources

Preparation of a radon-free thoron source for a thoron calibration chamber

Journal of Radioanalytical and Nuclear Chemistry, 2016
During long-term radon/thoron surveys, solid-state nuclear track detectors (SSNTDs) are commonly used. For the application of these integral devices, it is important to solve the commensurate calibration. At the calibration process, radon can be interfering with thoron; therefore, radon-free thoron atmosphere is required for the accurate calibration ...
Ferenc Fábián, Anita Csordás, Zoltán Sas, Tibor Kovács   +3 more
openaire   +1 more source