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Dosimetry - Astrophysics Data System

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Last Updated: 03 August 2022

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Exobiological Application of Spore Dosimeter in Studies Involving Solar UV Radiation

In the testing of the UV and the measurements compared to UV data obtained by Brewer Spectrophotometers at the INPEs Southern Space Observatory in South of Brazil, a biosensor based in the spore inactivation doses of Bacillus subtilis strain TKJ6312 has been used. Moreover, spores analyses from other locations around the world support the UV seasonal variation findings quoted by the literature in terms of varied and difficult environmental conditions from equatorial to higher latitudes sites. The application of the Bacillus subtilis TKJ 6312 seems to be a very useful biosensor device considering the international exobiology groups' desire to investigate spatial solar radiation in various planetary environments using biological techniques.

Source link: https://ui.adsabs.harvard.edu/abs/2009OLEB...39..373R/abstract


Plastic scintillator-based fibre dosimeters for measurement of X-ray pulses in a clinical setting

Based on simple Plug and Play concepts for the rapid and effective assembly of radiation sensors, two different versions of BCF10 joined to PMMA fibre were considered. The purpose of keeping the original 1-mm fibre diameter for the sensor probe was to maintain the original 1-mm fibre diameter for the sensor probe. The second design investigated the coupling joint of a cylindrical protrusion and hollow piece of BCF10-PMMA produced using femtosecond laser machining; the object of which was to determine the coupling joint of a cylindrical protrusion and hollow part of BCF10-PMMA. The flat surface connection of BCF-10 to PMMA gives marginally higher photon counts when comparing both sensors against the different joint coupling styles, according to the micro-machined sensor. However, the difference is negligible, and the Plug n Play sensor, which is suitable for inserting into a tiny applicator or in-vivo monitoring, is negligible. Micro-pulses of X-Ray radiation from Siemens Linear Accelerator were produced and tested for two different energies and dose rates in the second segment.

Source link: https://ui.adsabs.harvard.edu/abs/2022SPIE12140E..0DK/abstract


Optomechanical measurements of optical fiber coating for radiation dosimetry and structural health monitoring

In this study, we demonstrate optomechanical measurements of radiation-induced changes in a silica optical fiber's acoustic velocity. The optomechanical measurement is based on forward Brillouin scattering in the fiber core, which has created acoustic waves that reach the fiber coating. Following gamma irradiation, we have shown that the stiffness of the coating increases following gamma irradiation, as determined by the time of flight of radial acoustic waves through the coating. The results revealed a linear relationship of the acoustic time-of-flight on the overall dose of gamma irradiation.

Source link: https://ui.adsabs.harvard.edu/abs/2022SPIE12140E..0BZ/abstract


Dosimetric performance of an inorganic optical fibre dosimeter when temporally separating Cherenkov radiation

When optical fibre dosimetry systems are exposed to ionizing radiation, unwanted Cerenkov radiation, and fluorescent light are produced in the fibre itself during irradiation, as optical fibre dosimetry systems are exposed to ionizing radiation. After the stem effect signal faded to safely eliminate Cerenkov radiation's contribution, this study used a time discrimination device among linac pulses. For different field sizes and compared to ion chamber measurements, depth dose profiles were determined.

Source link: https://ui.adsabs.harvard.edu/abs/2022SPIE12139E..0NA/abstract


Characterisation of graphite-based material for dosimetry in the mammographic energy range

The investigation herein indicates that the use of a large 0. 3 mm of 2B and HB grade polymer pencil-lead graphite i. e. With a focus on the relationship between absorbent radiation energy and induced material changes within the dose range 3-11 mGy, investigations of thermo- and photoluminescence dose dependence, as well as improvements in Raman spectroscopic properties, have been carried out. All graphite samples demonstrated good linear response in terms of thermoluminescence yield per unit mass within the dose study, with excellent linear behavior. graphite sheets in mammographic studies report promising results as a marker of skin exposure, with no chance for interference with an individual patient's breast image during routine screening, closely matching the safe atomic number of soft tissues, while still providing the basis for a low-cost, highly efficient method for studying radiation-driven changes in carbon.

Source link: https://ui.adsabs.harvard.edu/abs/2022RaPC..20110405B/abstract

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions