Esteya® (Elekta Brachytherapy, Veenendaal, The Netherlands) is an electronic brachytherapy (eBT) system based on a 69.5 kVp x-ray source and a set of collimators of 1 to 3 cm in diameter, used for treating non-melanoma skin cancer lesions. This study aims to estimate room shielding requirements for this unit. The non-primary (scattered and leakage) ambient dose equivalent rates were measured with a Berthold LB-133 monitor (Berthold Technologies, Bad Wildbad, Germany). The latter ranges from 17 mSv h at 0.25 m distance from the x-ray source to 0.1 mSv h at 2.5 m. The necessary room shielding was then estimated following US and some European guidelines. The room shielding for all barriers considered was below 2 mmPb. The dose to a companion who, exceptionally, would stay with the patient during all treatment was estimated to be below 1 mSv if a leaded apron is used. In conclusion, Esteya shielding requirements are minimal.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1088/1361-6498/aa56cf | DOI Listing |
Npj Flex Electron
October 2024
Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA.
The integration of flexible electronics and photonics has the potential to create revolutionary technologies, yet it has been challenging to marry electronic and photonic components on a single polymer device, especially through high-volume manufacturing. Here, we present a robust, chiplet-level heterogeneous integration of polymer-based circuits (CHIP), where several post-fabricated, ultrathin, polymer electronic, and optoelectronic chiplets are vertically bonded into one single chip at room temperature and then shaped into application-specific form factors with monolithic Input/Output (I/O). As a demonstration, we applied this process and developed a flexible 3D-integrated optrode with high-density arrays of microelectrodes for electrical recording and micro light-emitting diodes (μLEDs) for optogenetic stimulation while with unprecedented integration of additional temperature sensors for bio-safe operations and shielding designs for optoelectronic artifact prevention.
View Article and Find Full Text PDFEnviron Technol
January 2025
Solid-State Physics and Accelerators Department, National Centre for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt.
Waste polyethylene (WPE) and virgin polyethylene (VPE) (50:50) thermoplastic have been melt-mixed with biochar (BC) made from orange peels at ratios of 5, 10, and 15(Phr) to evaluate how the filler content affected the mechanical, thermal, optical, electrical conductivity, and electromagnetic interference (EMI). γ-rays was applied to the prepared specimens to assess how radiation affected the created biocomposites. From the obtained results, the combination of BC with γ-rays, at doses of up to 100 kGy, with thermoplastic resulted in an enhanced mechanical property, particularly for composites containing 15 Phr of BC added because of its unique structure and excellent dispersion.
View Article and Find Full Text PDFInt J Womens Health
December 2024
Emergency Room, Shijiazhuang Maternal and Child Health Hospital, Shijiazhuang, People's Republic of China.
ACS Appl Mater Interfaces
January 2025
School of Chemical and Biological Engineering, Institute of Engineering Research, College of Engineering, Seoul National University, Seoul 08826, Republic of Korea.
Stable hollow-type microspheres (MSs) have been fabricated using α-synuclein (αS), an amyloidogenic protein, via freeze-induced protein self-assembly. This assembly process involves three steps: rapid freezing to form spherical protein condensates from αS oligomers, frozen annealing to form a crust on the condensate and freeze-drying to create an interior lumen via the three-dimensional (3D) coffee-stain effect. The crust produced during the frozen-annealing step is a β-sheet-mediated protein structure that is presumed to be created at the quasi-liquid layer of the protein-ice interface and thus contributes to the stability of MSs in aqueous solutions at room temperature without any additional surface stabilization.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
State Key Laboratory for New Textile Materials and Advanced Processing Technology, School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, PR China. Electronic address:
The design of multifunctional, high-performance wearable heaters utilizing textile substrates has garnered increasing attention, particularly in the development of body temperature and health monitoring devices. However, fabricating these multifunctional wearable heaters while simultaneously ensuring flexibility, air permeability, Joule heating performance, electromagnetic interference (EMI) shielding and antibacterial properties remains a significant challenge. This study utilizes phase transition lysozyme (PTL) film-mediated electroless deposition (ELD) technology to deposit silver nanoparticles (Ag NPs) on the cotton fabrics surface in a mild aqueous solution at room temperature, thereby constructing a wearable heater with long-term stability, high conductivity, and exceptional photothermal properties.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!