Effect of the Grain Size of the Soil on the Measured Activity and Variation in Activity in Surface and Subsurface Soil Samples

Al-Sulaiti, Huda; Nasir, Tabassum; Regan, P.H.; Bradley, D.A.; Al-Mugren, Khulud; Alkhomashi, N.; Al‐Dahan, N.; Al-Dosari, M.; Bukhari, S.; Matthews, Marcus; Santawamaitre, T.; Malain, D.; Habib, A. F.

doi:10.52763/pjsir.phys.sci.57.3.2014.129.138

Cited by 7 publications

(1 citation statement)

References 16 publications

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“…However, with the radioactivity per unit mass being typically greater for smaller particles (Al-Sulaiti et al 2014), with preferential adsorption on the surface and the surface area per unit volume increasing with decrease in radius, this makes for an elevated dose estimate. Al-Sulaiti et al (2014) showed factors of between 2 and 4 between the radioactivity evaluated on the basis of smaller particles (∼0.5 mm) compared to larger particle sizes (∼2 mm). In regard to the TLD samples, overall the radiation absorbed dose trends followed similar patterns of variation for all locations; absorbed gamma-ray dose evaluations through the use of the PCFc-Ge TLDs yield the greatest values, followed by PCFc-GE-B, TLD-100, and TLD-200.…”

Section: Comparison Of Soils and Tld Dose-rate Surveymentioning

confidence: 97%

Environmental monitoring through use of silica-based TLD

et al. 2017

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The sensitivity of a novel silica-based fibre-form thermoluminescence dosimeter was tested off-site of a rare-earths processing plant, investigating the potential for obtaining baseline measurements of naturally occurring radioactive materials. The dosimeter, a Ge-doped collapsed photonic crystal fibre (PCFc) co-doped with B, was calibrated against commercially available thermoluminescent dosimetry (TLD) (TLD-200 and TLD-100) using a bremsstrahlung (tube-based) x-ray source. Eight sampling sites within 1 to 20 km of the perimeter of the rare-earth facility were identified, the TLDs (silica- as well as TLD-200 and TLD-100) in each case being buried within the soil at fixed depth, allowing measurements to be obtained, in this case for protracted periods of exposure of between two to eight months. The values of the dose were then compared against values projected on the basis of radioactivity measurements of the associated soils, obtained via high-purity germanium gamma-ray spectrometry. Accord was found in relative terms between the TL evaluations at each site and the associated spectroscopic results. Thus said, in absolute terms, the TL evaluated doses were typically less than those derived from gamma-ray spectroscopy, by ∼50% in the case of PCFc-Ge. Gamma spectrometry analysis typically provided an upper limit to the projected dose, and the Marinelli beaker contents were formed from sieving to provide a homogenous well-packed medium. However, with the radioactivity per unit mass typically greater for smaller particles, with preferential adsorption on the surface and the surface area per unit volume increasing with decrease in radius, this made for an elevated dose estimate. Prevailing concentrations of key naturally occurring radionuclides in soil, Ra,Th and K, were also determined, together with radiological dose evaluation. To date, the area under investigation, although including a rare-earth processing facility, gives no cause for concern from radiological impact. The current study reveals the suitability of the optical fibre based micro-dosimeter for all-weather monitoring of low-level environmental radioactivity.

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Section: Comparison Of Soils and Tld Dose-rate Surveymentioning

confidence: 97%