A new method for evaluating radon and thoron α-activities per unit volume inside and outside various natural material samples by calculating SSNTD detection efficiencies for the emitted α-particles and measuring the resulting track densities

Misdaq, M. A.; Aitnouh, F.; Khajmi, Hassan; Ezzahery, H.; Berrazzouk, S.

doi:10.1016/s0969-8043(00)00381-x

Cited by 24 publications

(9 citation statements)

References 19 publications

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“…According to a method developed by [15] when the CR-39 and LR-115 type II SSNTD are separately placed in close contact with a homogeneous studied sample (soils and the studied plants) in a hermetically sealed cylindrical plastic container for 1 month (Figure 4), one can evaluate radon (Ac ( 222 Rn)) and thoron (Ac ( 220 Rn)) alpha-activities inside the sample by using the following equations: inside the studied material sample, k i is the branching ratio corresponding to the disintegration of the nuclei of uranium and thorium groups, R iα is the range of α-particle of energy E αi in the material sample and it is calculated by means of the TRIM programme [16] and CR-39 SSNTD in µm. ∆R S =R max (E max )−R min (E min ), R max and R min are the ranges of α-particles in the sample which corresponds to the energy windows E max and E min at the upper and lower ends, both of which are functions of the detector and critical angle.…”

Section: Methods Of Studymentioning

confidence: 99%

Determination of Radon and Thoron Concentrations in Different Parts of Some Plants Used in Traditional Medicine Using Nuclear Track Detectors

Oufni¹,

Manaut²,

Taj³

et al. 2013

ENV

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The paper presents results of radon ( 222 Rn) and thoron ( 220 Rn) levels in different parts of some selected plants used in Moroccan cooking and traditional medicine. Plant uptake of radionuclide is one of many vectors for introduction of contaminants into the human food chain. Thus, it is critical to understand the soil-plant relationships that control nuclide bioavailability. The radon and thoron concentrations have been determined in the studied samples and their corresponding soils, and that using the technique based on two types of solid state nuclear track detectors ( Rn from soil to parts of various studied plants have been determined. TF for roots were higher than those for stems and leaves. The radon and thoron activities in the soils have been found varying from 0.87 ± 0.06Bq.kg -1 to 6.20 ± 0.47Bq.kg -1 and from 30 ± 2.30mBq.kg -1 to 195±16mBq.kg -1, respectively. These values are lower in the leaves and stems than those determined in the roots of the studied plants. The aim of this study was to analyze the radon transfer from soil to different compartments of these plants and then to evaluate the radiotoxicity caused by radon in order to contribute to the health risk assessment.

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Section: Methods Of Studymentioning

confidence: 99%

Determination of Radon and Thoron Concentrations in Different Parts of Some Plants Used in Traditional Medicine Using Nuclear Track Detectors

Oufni¹,

Manaut²,

Taj³

et al. 2013

ENV

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“…The angles and ! were calculated using a method described by Misdaq et al [8]. The traces densities recorded on the detectors CR-39 ( ) and LR-115 II ), after subtracting the corresponding background noise, are given by the following expressions [4]:…”

Section: Locality Of the Table Oilmentioning

confidence: 99%

Measurement of²³⁸U,²³²Th and²²²Rn concentrations in different table oils samples. Determination of committed effective doses received by consumers following the ingestion of table oil.

Touti

2019

Polish Journal of Medical Physics and Engineering

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The main objective of our work is to measure 238U, 232Th, 222Rn and 220Rn in different table oil samples using a method based on the use of two types of solid nuclear track detectors: CR- 39 and LR-115 II in order to determine the doses of radiation received by the individuals following ingestion of the samples of table oil studied. Indeed, we have developed an original method based on the determination of the detection efficiencies of CR-39 and LR-115 II solid nuclear track detectors for alpha particles emitted from the uranium 238 and thorium 232 series to evaluate 238U, 232Th, 222Rn and 220Rn concentrations in different table oil samples. We were able to determine doses of radiation due to 238U, 232Th and 222Rn received by individuals of the Moroccan, French, Italy, Spain and Tunisia populations following the ingestion of table oil. The effective doses committed due to 238U, 232Th, and 222Rn following the ingestion of the table oil by the consumers were determined. The maximum total committed effective dose was found equal to (10±0.7) µSv·y−1 of the Moroccan population, (11.6±0.7) µSv·y−1 of the French population, (10.3±0.7) µSv.y−1 of the Italian population, (10.4±0.5) µSv·y−1 of the Spanish population and (10.5±0.7) µSv·y−1 of the Tunisian population is much lower than the average dose given by the United Nations Scientific Committee on the Effects of Atomic Radiation [1] for ingestion (0.2 to 0.8 mSv·y−1). The results obtained using our method are in very good agreement with those obtained using the model of the International Commission on Radiological Protection

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“…According to one of our previous works [11] when we place the SSNTDs directly on the honey, nectar solution, plant flower, and soil samples studied (figure 2) and assume a secular radioactive equilibrium between uranium ( 238 U) and radon ( 222 Rn) on the one hand and between thorium ( 232 Th) and thoron ( 220 Rn) on the other hand, track densities due to α-particles emitted by the uranium and thorium series inside these samples and registered on the CR-39 (ρ CR G ) and LR-115 type II (ρ LR G ) films are given by…”

Section: Description Of the Studied Honey Samplesmentioning

confidence: 99%

The influence of the nature of soil and plant and pollution on the 238U, 232Th, 222Rn and 220Rn concentrations in various natural honey samples using nuclear track detectors: Impact on the adult consumers

Misdaq

Mortassim

2009

Pramana - J Phys

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238 U and 232 Th concentrations as well as 222 Rn and 220 Rn α-activities per unit volume were measured in various natural honey samples collected from different regions in Morocco using CR-39 and LR-115 type II solid state nuclear track detectors (SSNTDs). These radionuclides were also measured in soils, plant flowers and nectar solutions corresponding to the honey samples studied. In addition, these radionuclides were measured in different imported honey samples. The measured 238 U, 232 Th, 222 Rn and 220 Rn concentrations ranged from (1.5 ± 0.1) mBq kg −1 to (10.6 ± 0.6) mBq kg −1 , (1.1 ± 0.1) mBq kg −1 to (4.2 ± 0.2) mBq kg −1 , (1.5 ± 0.1) Bq kg −1 to (10.6 ± 0.6) Bq kg −1 and (1.1 ± 0.1) Bq kg −1 to (4.2 ± 0.2) Bq kg −1 for the honey samples studied, respectively. Annual 238 U, 232 Th and 222 Rn intakes by Moroccan adults from the consumption of honey were assessed. The influence of the nature of soil and plant on the 238 U and 232 Th contents of the studied honey samples was investigated. These measurements were completed by an investigation of the 238 U and 232 Th transfer between soils and plant flowers and that between plant flowers and honey, and also by the investigation of the influence of pollution due to different material dusts on 238 U, 232 Th and 222 Rn in the honey samples studied. Committed equivalent doses due to the annual intake of 238 U, 232 Th and 222 Rn were evaluated in the organs of adult members of the Moroccan rural population from the ingestion of the honey samples. The maximum total committed effective dose due to 238 U, 232 Th and 222 Rn from the ingestion of natural honey by the Moroccan rural population was found to be equal to 0.64 μ Sv y −1 .

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A new method for evaluating radon and thoron α-activities per unit volume inside and outside various natural material samples by calculating SSNTD detection efficiencies for the emitted α-particles and measuring the resulting track densities

Cited by 24 publications

References 19 publications

Determination of Radon and Thoron Concentrations in Different Parts of Some Plants Used in Traditional Medicine Using Nuclear Track Detectors

Determination of Radon and Thoron Concentrations in Different Parts of Some Plants Used in Traditional Medicine Using Nuclear Track Detectors

Measurement of²³⁸U,²³²Th and²²²Rn concentrations in different table oils samples. Determination of committed effective doses received by consumers following the ingestion of table oil.

The influence of the nature of soil and plant and pollution on the 238U, 232Th, 222Rn and 220Rn concentrations in various natural honey samples using nuclear track detectors: Impact on the adult consumers

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A new method for evaluating radon and thoron α-activities per unit volume inside and outside various natural material samples by calculating SSNTD detection efficiencies for the emitted α-particles and measuring the resulting track densities

Cited by 24 publications

References 19 publications

Determination of Radon and Thoron Concentrations in Different Parts of Some Plants Used in Traditional Medicine Using Nuclear Track Detectors

Determination of Radon and Thoron Concentrations in Different Parts of Some Plants Used in Traditional Medicine Using Nuclear Track Detectors

Measurement of238U,232Th and222Rn concentrations in different table oils samples. Determination of committed effective doses received by consumers following the ingestion of table oil.

The influence of the nature of soil and plant and pollution on the 238U, 232Th, 222Rn and 220Rn concentrations in various natural honey samples using nuclear track detectors: Impact on the adult consumers

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Measurement of²³⁸U,²³²Th and²²²Rn concentrations in different table oils samples. Determination of committed effective doses received by consumers following the ingestion of table oil.