Sentences with phrase «ionization source»

The method used to measure the neutral clusters utilizes a combination of a mass spectrometer and a chemical ionization source, which was developed by the University of Frankfurt and the University of Helsinki.

Using our deep scientific and engineering expertise, we develop a broad portfolio of chemist - centric, purpose - built mass spectrometers, nanoelectrospray ionization sources, flow - chemistry synthesis systems and consumables characterized by their reliability, high quality and flexibility.

Not exact matches

The six benchmarks are: 1) HDR brachytherapy procedures are supported with the appropriate team as described in the report of the AAPM TG 59 and the American College of Radiology HDR Brachytherapy Practice Standard; 2) commissioning of the treatment unit, treatment planning system and each new source is performed by a qualified medical physicist and verified through a QA process; 3) assay of the HDR brachytherapy unit source is performed using a well - type ionization chamber with a calibration traceable to the National Institute of Standards and Technology, and this assay is performed or confirmed for each source change.

While the exact mechanism for charging and for initiating lightning within the Venusian clouds is not currently known (Yair 2012) it is nonetheless likely that cosmic ray ionization has an important role in this process as it is believed to be the primary source of atmospheric ions at middle and low altitudes.

Gradually, energetic radiation emitted by the first sources caused local heating, and then ionization of the hydrogen in the Universe.

IP25, tri-unsaturated HBI (HBI - III, Z - isomere41), and sterols were analyzed by gas chromatography (GC) using an Agilent Technologies 7890B (30 m DB - 1MS column, 0.25 mm i.d., 0.25 µm film thickness) coupled to an Agilent Technologies 5977A Extractor mass selective detector (MSD, 70 eV constant ionization potential, Scan 50 — 550 m / z, 1 scan / s, ion source temperature 230 °C, Performance Turbo Pump).

As GCR is the primary source of atmospheric ionization, it has been suggested that GCR may act to amplify relative small variations in solar activity into climatologically significant effects (Ney, 1959), via a hypothesised relationship between ionization and cloudiness (e.g., Dickinson, 1975; Kirkby, 2007).

Strontium isotope ratios can be measured at the delta ppm level using a medium to high resolution magnetic sector mass spectrometer with multiple fixed collectors and either thermal ionization or inductively coupled plasma as an ion source.