Assessment of the effectiveness of attenuation of Pb aprons by using TLD dosimetry and Monte Carlo calculations

Dávila, Hernán Olaya; Merchán, José A.; Vega-Carrillo, Héctor René; Ovalle, Segundo Agustín Martínez

doi:10.1016/j.apradiso.2017.05.012

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Since linear attenuation coefficient varies with the density of the attenuating material, the attenuation of the prepared nanocomposite blocks is given in terms of the mass attenuation coefficient (l q ). The mass attenuation coefficient is defined as the linear attenuation coefficient per unit density of the material (Davila et al 2017;Ersundu et al 2017). Nanocomposites containing 25 wt% G2 nanoparticles exhibit the highest mass attenuation coefficient compared to the rest of the prepared samples and is found to be in the range of 7.77-0.09 cm 2 /g for X-ray photon energy of 30-47 keV.…”

Section: Methodsmentioning

confidence: 99%

Preparation, characterization and X-ray attenuation property of Gd2O3-based nanocomposites

2017

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In an attempt to develop an alternate to leadbased X-ray shielding material, we describe the X-ray attenuation property of nanocomposites containing Gd 2 O 3 as nanofiller and silicone resin as matrix, prepared by a simple solution-casting technique. Gd 2 O 3 nanoparticles of size 30 and 56 nm are used at concentrations of 25 and 2.5 wt%. The nanoparticles and the nanocomposites are characterized using X-ray diffraction (XRD) studies, small angle X-ray spectroscopy (SAXS), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and atomic force microscopy (AFM). The X-ray attenuation property of nanocomposites, studied using an industrial X-ray unit, shows that nanocomposites containing nanoparticles of size 56 nm (G2) exhibit better attenuation than nanocomposites containing nanoparticles of size 30 nm (G1), which is attributed to the greater interfacial interaction between the G2 nanofillers and silicone matrix. In the case of nanocomposites containing G1 nanoparticles, the interfacial interaction between the nanofiller and the matrix is so weak that it results in pulling out of nanofillers, causing voids in the matrix, which act as X-ray transparent region, thereby reducing the overall X-ray attenuation property of G1 nanocomposites. This is further corroborated from the AFM images of the nanocomposites. The weight loss and heat flow curves of pure silicone matrix and the nanocomposites containing Gd 2 O 3 nanoparticles of size 30 and 56 nm show the degradation of silicone resin, due to chain scission, between 403 and 622°C. The same onset temperature (403°C) of degradation of matrix with and without nanoparticles shows that the addition of nanofillers to the matrix does not deteriorate the thermal stability of the matrix. This confirms the thermal stability of nanocomposites. Therefore, our study shows that nanocomposites containing G2 nanoparticles are potential candidates for the development of X-ray opaque fabric material.

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Section: Methodsmentioning

confidence: 99%

Preparation, characterization and X-ray attenuation property of Gd2O3-based nanocomposites

2017

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“…For medical radiation qualities, the underestimation of the unshielded Hp (10) in a measurement on the outside of the apron is in the order of 25% (12). In the extrapolation of annual doses from such measurements it needs to be taken into account, to ensure a conservative result, even though the larger influence on the accuracy of the extrapolation will be the uncertainty of the shielding factor of the apron in this calculation (13)(14)(15).…”

Section: Uncertainties and Detection Limitsmentioning

confidence: 99%

“…The WBD was measured on the outside of the lead apron in order to increase the signal to the dosemeter. When reporting calculated annual dose values for the WBD in the "Results" section, the measured value was decreased by a factor 10, representing the shielding of the apron (13)(14)(15). Furthermore, the annual dose was corrected for the systematic uncertainty in backscatter, as explained in the "Uncertainties and detection limits" section.…”

Section: Calculated Annual Dosementioning

confidence: 99%

Staff dose evaluation by application of radiation protection during endoscopic retrograde cholangiopancreatography (ERCP) procedures performed with a mobile C-arm

Österlund¹,

Drohn

Hoedlmoser

et al. 2020

Acta Radiol

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Background The radiation dose to staff performing endoscopic retrograde cholangiopancreatography (ERCP) is not negligible. Purpose To evaluate the shielding effect of a table-suspended lower-body radiation shield for the positions in the room occupied by the operator, assisting nurse, and anesthesiologist, used during ERCP procedures with a mobile C-arm. Material and Methods Eye lens dose, whole body dose, and extremity dose were measured with and without a table-suspended lower-body radiation shield in a phantom model and in clinical routine work. The effect of the shield was evaluated for each scenario and compared, and a projection was made for when shielding should be required from a regulatory point of view. Results In the phantom measurements, the shield provided significant shielding effects on the body and lower extremities for the operator but no significant shielding of the eye lens. The shielding effect for the assisting nurse was limited to the lower extremity. The clinical measurements yielded the same general result as the phantom measurements, with the major difference that the shield provided no significant reduction in the whole-body dose to the operator. Conclusion The table-suspended shield has a significant shielding effect for the lower extremities of the operator and assisting nurse. For annual dose–area product values >300,000 cGycm2, the protection of the operator should be reinforced with a ceiling-suspended shield to avoid doses to the eye lens and body in excess of regulatory dose restrictions.

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A dosimetric study of occupational exposure during computed tomography procedures

Silva,

Caixeta,

Souza

et al. 2024

Radiation Physics and Chemistry

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Assessment of the effectiveness of attenuation of Pb aprons by using TLD dosimetry and Monte Carlo calculations

Cited by 4 publications

References 6 publications

Preparation, characterization and X-ray attenuation property of Gd2O3-based nanocomposites

Preparation, characterization and X-ray attenuation property of Gd2O3-based nanocomposites

Staff dose evaluation by application of radiation protection during endoscopic retrograde cholangiopancreatography (ERCP) procedures performed with a mobile C-arm

A dosimetric study of occupational exposure during computed tomography procedures

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