The measured dependence of laboratory beta dose rates on sample grain size

2005 ◽  
Vol 39 (2) ◽  
pp. 123-127 ◽  
Author(s):  
S.J. Armitage ◽  
R.M. Bailey
Keyword(s):  
Grain Size ◽  
Dose Rates ◽  
Measured Dependence ◽  
Beta Dose

scholarly journals Attenuation of beta radiation in granular matrices: implications for trapped-charge dating

2021 ◽  
Author(s):  
Alastair Charles Cunningham ◽  
Jan-Pieter Buylaert ◽  
Andrew Sean Murray
Keyword(s):  
Grain Size ◽  
Dose Rate ◽  
Radiation Transport ◽  
Beta Radiation ◽  
Host Matrix ◽  
Beta Particles ◽  
Dose Rates ◽  
Homogenous Medium ◽  
Beta Dose ◽  
Trapped Charge

Abstract. Mineral grains within sediment or rock absorb a radiation dose from the decay of radionuclides in the host matrix. For the beta dose component, the estimated dose rate must be adjusted for the attenuation of beta particles within the mineral grains. Standard calculations, originally designed for thermoluminescence dating of pottery, assume that the grain is embedded in a homogenous medium. However, most current applications of trapped-charge dating concern sand- or silt-sized dosimeters embedded in granular sediment. In such cases, the radionuclide sources are not homogeneous, but are localized in discrete grains or held on grain surfaces. We show here that the mean dose rate to dosimeter grains in a granular matrix is dependent on the grain-size distributions of the source grains, and of the bulk sediment, as well as on the grain size of the dosimeters. We further argue that U and Th sources are likely to be held primarily on grain surfaces, which causes the dose rate to dosimeter grains to be significantly higher than for sources distributed uniformly throughout grains. For a typical well-sorted medium sand, the beta dose rates derived from surface U and Th sources are higher by 9 % and 14 %, respectively, compared to a homogenous distribution of sources. We account for these effects using an expanded model of beta attenuation, and validate the model against Monte Carlo radiation transport simulations within a geometry of packed spheres.

Electron and Beta Dose Rates of UO2 Pellet and Fuel Rod

2013 ◽  
Author(s):  
Guoqing Zhang ◽  
Xuexin Wang ◽  
Jiangang Zhang ◽  
Dajie Zhuang ◽  
Chaoduan Li ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Dose Rate ◽  
Radiation Protection ◽  
High Dose Rate ◽  
High Dose ◽  
Electron Dose ◽  
Dose Rates ◽  
Fuel Rod ◽  
Calculation Results ◽  
Beta Dose

The isotopes of uranium and their daughter nuclides inside the UO2 pellet emit mono-energetic electrons and beta rays, which generate rather high dose rate near the UO2 pellet and could cause exposure to workers. In this work calculations of electron dose rates have been carried out with Monte Carlo codes, MCNPX and Geant4, for a UO2 pellet and a fuel rod. Comparisons between calculations and measurements have been carried out to verify the calculation results. The results could be used to estimate the dose produced by electrons and beta rays, which could be used to make optimization for radiation protection purpose.

scholarly journals Deriving spatially resolved beta dose rates in sediment using the Timepix pixelated detector

2017 ◽  
Vol 106 ◽  
pp. 483-490 ◽  
Author(s):  
Anna A. Romanyukha ◽  
Alastair C. Cunningham ◽  
Stuart P. George ◽  
Susanna Guatelli ◽  
Marco Petasecca ◽  
...  
Keyword(s):  
Dose Rates ◽  
Spatially Resolved ◽  
Beta Dose

2D modelling: A Monte Carlo approach for assessing heterogeneous beta dose rates in luminescence and ESR dating: Paper ΙΙ, application to igneous rocks

2018 ◽  
Vol 48 ◽  
pp. 195-206 ◽  
Author(s):  
Fang Fang ◽  
Loïc Martin ◽  
Ian S. Williams ◽  
Frank Brink ◽  
Norbert Mercier ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Igneous Rocks ◽  
Esr Dating ◽  
Monte Carlo Approach ◽  
Dose Rates ◽  
2D Modelling ◽  
Beta Dose

Direct Measurement of Beta Dose Rates in Tissue at Protection Levels

1975 ◽  
Vol 29 (5) ◽  
pp. 747-751
Author(s):  
I. S. Sundara Rao ◽  
S. B. Naik
Keyword(s):  
Direct Measurement ◽  
Dose Rates ◽  
Beta Dose
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