Electret ion chambers (EICs), commercially available under brand name E-PERM(®), are widely used for measuring indoor and outdoor (222)Rn concentrations in air. These are designed to respond only to (222)Rn and not to (220)Rn by restricting diffusional entry area. Such radon EIC (R EIC) monitors are modified by increasing the entry area to allow (220)Rn, in addition to (222)Rn. Such modified units are called RT EIC. When a set of R and RT EICs are collocated, it is possible to discriminate and measure both radon and thoron concentrations, using appropriate calibration factors (CFs) and algorithms. The EICs come in different volumes, providing different sensitivities. The thoron CFs for 58-, 210- and 960-ml volume R and RT pairs are, respectively, 2.8-, 18.7- and 89-V drop per (kBq m(-3) d ), respectively. These provide much wider sensitivities and ranges compared to alpha track-based passive radon-thoron discriminative monitors.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1093/rpd/ncq231 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Electret Production and Applications with Special Regard to Health Physics Dosimetry: A Review.
Health Phys
November 2024
Health Physics and Dosimetry Research Laboratory, Department of Energy Engineering and Physics, Amirkabir University of Technology, Tehran, Islamic Republic of Iran.
An electret detector is a piece of dielectric material film charged or polarized by a specific charging method to induce a quasi-permanent electric field. Electret films perform unique characteristics for production and applications in many areas of science and technology, especially in health physics dosimetry. A charged electret detector, when placed in an ionized environment, collects negative or positive ions depending on its original charging state, which reduces its original charge.
View Article and Find Full Text PDFA protet-based model that can account for energy coupling in oxidative and photosynthetic phosphorylation.
Biochim Biophys Acta Bioenerg
November 2024
Department of Biochemistry, Cell and Systems Biology, Institute of Systems, Molecular and Integrative Biology, Faculty of Health and Life Sciences, University of Liverpool, L69 7ZB, UK; The Novo Nordisk Foundation Centre for Biosustainability, Technical University of Denmark, Building 220, Søltofts Plads, 2800 Kgs Lyngby, Denmark; Department of Physiological Sciences, Faculty of Science, Stellenbosch University, Stellenbosch, Private Bag X1, Matieland, 7602, South Africa. Electronic address:
Article Synopsis
- Two-stage phosphorylation experiments indicate that a high-energy intermediate connects electron transport to phosphorylation, supporting the chemiosmotic coupling hypothesis.
- However, there is a threshold for proton motive force (pmf) below which phosphorylation does not occur, raising questions about the sufficiency of pmf generated by electron transport.
- Recent findings suggest that pmf values, particularly Δψ, may be lower than previously thought, and a charge separation model may provide a better explanation of the energy coupling mechanisms involved in phosphorylation.
Assessment of the Radioactivity, Metals Content and Mineralogy of Granodiorite from Calabria, Southern Italy: A Case Study.
Materials (Basel)
August 2024
Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università degli Studi di Messina, V.le F. Stagno D'Alcontres, 31, 98166 Messina, Italy.
In this paper, an assessment of the natural radioactivity level, radon exhalation, metal contamination, and mineralogy of a granodiorite rock sample from Stilo, in the Calabria region, Southern Italy is presented as a case study. This rock was employed as a building material in the area under study. The specific activity of Ra, Th and K natural radioisotopes was assessed through high-purity germanium (HPGe) gamma-ray spectrometry.
View Article and Find Full Text PDFHydrogen-induced tunable remanent polarization in a perovskite nickelate.
Nat Commun
June 2024
Department of Electrical & Computer Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, USA.
Materials with field-tunable polarization are of broad interest to condensed matter sciences and solid-state device technologies. Here, using hydrogen (H) donor doping, we modify the room temperature metallic phase of a perovskite nickelate NdNiO into an insulating phase with both metastable dipolar polarization and space-charge polarization. We then demonstrate transient negative differential capacitance in thin film capacitors.
View Article and Find Full Text PDFAcid-Doped Pyridine-Based Polybenzimidazole as a Positive Triboelectric Material with Superior Charge Retention Capability.
ACS Nano
February 2024
National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education; Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing; Department of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, People's Republic of China.
The energy conversion efficiency of a triboelectric nanogenerator (TENG) is severely limited by the charge density of triboelectric materials, while drastic and unavoidable charge decay happens during contact due to the insufficient charge retention capacity of positive triboelectric materials. Here, elaborately synthesized acid-ion-doped pyridine-based polybenzimidazole processing with strong charge retention capability is demonstrated to couple with negatively corona-polarized electrets. As illustrated by thermal stimulation and an ion mass spectrometer, the formation of acid-ion chimerism processes high activation energy for stored charges, and the selective anion migration can compensate the escape of polarized charge.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!