Rivista e Edizione

Volume 67 (2022): Edizione 2 (June 2022)

Volume 67 (2022): Edizione 1 (March 2022)

Volume 66 (2021): Edizione 4 (December 2021)

Volume 66 (2021): Edizione 3 (September 2021)

Volume 66 (2021): Edizione 2 (June 2021)

Volume 66 (2021): Edizione 1 (March 2021)

Volume 65 (2020): Edizione 4 (December 2020)

Volume 65 (2020): Edizione 3 (September 2020)

Volume 65 (2020): Edizione 2 (June 2020)

Volume 65 (2020): Edizione 1 (March 2020)

Volume 64 (2019): Edizione 4 (December 2019)

Volume 64 (2019): Edizione 3 (September 2019)

Volume 64 (2019): Edizione 2 (June 2019)

Volume 64 (2019): Edizione 1 (March 2019)

Volume 63 (2018): Edizione 4 (December 2018)

Volume 63 (2018): Edizione 3 (September 2018)

Volume 63 (2018): Edizione 2 (June 2018)

Volume 63 (2018): Edizione 1 (March 2018)

Volume 62 (2017): Edizione 4 (December 2017)

Volume 62 (2017): Edizione 3 (September 2017)

Volume 62 (2017): Edizione 2 (June 2017)

Volume 62 (2017): Edizione 1 (March 2017)

Volume 61 (2016): Edizione 4 (December 2016)

Volume 61 (2016): Edizione 3 (September 2016)

Volume 61 (2016): Edizione 2 (June 2016)

Volume 61 (2016): Edizione 1 (March 2016)

Volume 60 (2015): Edizione 4 (December 2015)

Volume 60 (2015): Edizione 3 (September 2015)

Volume 60 (2015): Edizione 2 (June 2015)

Volume 60 (2015): Edizione 1 (March 2015)

Volume 59 (2014): Edizione 4 (December 2014)

Volume 59 (2014): Edizione 3 (August 2014)

Volume 59 (2014): Edizione 2 (June 2014)

Volume 59 (2014): Edizione 1 (March 2014)

Dettagli della rivista
Formato
Rivista
eISSN
1508-5791
Pubblicato per la prima volta
25 Mar 2014
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

Volume 67 (2022): Edizione 2 (June 2022)

Dettagli della rivista
Formato
Rivista
eISSN
1508-5791
Pubblicato per la prima volta
25 Mar 2014
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

2 Articoli

Original Paper

access type Accesso libero

Effect of electron beam irradiation on filtering facepiece respirators integrity and filtering efficiency

Pubblicato online: 11 Jun 2022
Pagine: 23 - 33

Astratto

Abstract

The outbreak of the COVID-19 pandemic has shown that the demand for medical masks and respirators exceeds the current global stockpile of these items, and there is a dire need to increase the production capacity. Considering that ionizing radiation has been used for sterilization of medical products for many years and electron beam (EB) irradiation enables the treatment of huge quantities of disposable medical products in a short time this method should be tested for the mask’s decontamination. In this work, three different filtering facepiece respirators (FFRs) were irradiated with electron beams of 12 kGy and 25 kGy. The results confirmed that the decrease in filtration efficiency after irradiation of all respirators results from the elimination of the electric charge from the polypropylene (PP) fibers in the irradiation process. Moreover, the applied doses may affect the thermal stability of PP fabrics, while filtering materials structure and integrity have not changed after irradiation.

Parole chiave

  • Electron beam irradiation
  • Decontamination
  • PP filtering facepiece respirators
  • Industrial applications
  • Processing technologies
  • Nanoparticles filtration
access type Accesso libero

Utilization of an energy-resolving detection system for mammography applications: A preliminary study

Pubblicato online: 11 Jun 2022
Pagine: 35 - 40

Astratto

Abstract

Breast cancer remains one of the major causes of mortality among female cancer patients. This fact caused a spark in the medical field, which in turn helped to improve the diagnostic and treatment of breast cancer patients over the years making this field always active with new ideas and innovative methods. In our study, a new method was explored using an energy-resolving detection system made from a NaI (Tl) scintillation detector to detect the gamma photons from an Am-241 radiation source to try and construct an image by scanning the American College of Radiology (ACR) mammography phantom. In addition to the experimental work, a Geant4 Application for Tomographic Emission (GATE) toolkit was used to investigate more complex options to improve the image quality of mammographic systems, which is limited by the experimental setup. From the experimental setup, the researchers were able to construct an image using the 26.3 keV and the 59.5 keV energy photons, to show the largest size tumour (12 mm) in the ACR phantom. With an improved setup in the simulation environment, the majority of the ACR phantom tumours was visible using both energy windows from the 26.3 keV and the 59.5 keV, where the 26.3 keV yielded better quality images showing four tumours compared to three when using 59.5 keV. The simulation results were promising; however, several improvements need to be incorporated into the experimental work so that the system can generate high-resolution mammographic images similar to the ones obtained by the GATE simulation setup.

Parole chiave

  • Energy-resolving detection systems
  • Gamma-ray imaging
  • GATE simulation toolkit
  • Mammography
2 Articoli

Original Paper

access type Accesso libero

Effect of electron beam irradiation on filtering facepiece respirators integrity and filtering efficiency

Pubblicato online: 11 Jun 2022
Pagine: 23 - 33

Astratto

Abstract

The outbreak of the COVID-19 pandemic has shown that the demand for medical masks and respirators exceeds the current global stockpile of these items, and there is a dire need to increase the production capacity. Considering that ionizing radiation has been used for sterilization of medical products for many years and electron beam (EB) irradiation enables the treatment of huge quantities of disposable medical products in a short time this method should be tested for the mask’s decontamination. In this work, three different filtering facepiece respirators (FFRs) were irradiated with electron beams of 12 kGy and 25 kGy. The results confirmed that the decrease in filtration efficiency after irradiation of all respirators results from the elimination of the electric charge from the polypropylene (PP) fibers in the irradiation process. Moreover, the applied doses may affect the thermal stability of PP fabrics, while filtering materials structure and integrity have not changed after irradiation.

Parole chiave

  • Electron beam irradiation
  • Decontamination
  • PP filtering facepiece respirators
  • Industrial applications
  • Processing technologies
  • Nanoparticles filtration
access type Accesso libero

Utilization of an energy-resolving detection system for mammography applications: A preliminary study

Pubblicato online: 11 Jun 2022
Pagine: 35 - 40

Astratto

Abstract

Breast cancer remains one of the major causes of mortality among female cancer patients. This fact caused a spark in the medical field, which in turn helped to improve the diagnostic and treatment of breast cancer patients over the years making this field always active with new ideas and innovative methods. In our study, a new method was explored using an energy-resolving detection system made from a NaI (Tl) scintillation detector to detect the gamma photons from an Am-241 radiation source to try and construct an image by scanning the American College of Radiology (ACR) mammography phantom. In addition to the experimental work, a Geant4 Application for Tomographic Emission (GATE) toolkit was used to investigate more complex options to improve the image quality of mammographic systems, which is limited by the experimental setup. From the experimental setup, the researchers were able to construct an image using the 26.3 keV and the 59.5 keV energy photons, to show the largest size tumour (12 mm) in the ACR phantom. With an improved setup in the simulation environment, the majority of the ACR phantom tumours was visible using both energy windows from the 26.3 keV and the 59.5 keV, where the 26.3 keV yielded better quality images showing four tumours compared to three when using 59.5 keV. The simulation results were promising; however, several improvements need to be incorporated into the experimental work so that the system can generate high-resolution mammographic images similar to the ones obtained by the GATE simulation setup.

Parole chiave

  • Energy-resolving detection systems
  • Gamma-ray imaging
  • GATE simulation toolkit
  • Mammography

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