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Characterisation of Organic Semiconductors for Ionising Radiation Dosi by Jessie Ann Posar

Extensive use of ionising radiation has increased dramatically with advances in medical diagnostic and radiation therapy, space exploration, security and defence, personal wearable dosimeters, and nuclear science. Many of these applications require the safe delivery of ionising radiation to the target volume while minimising toxicity or exposure to the patient or safety personnel. Therefore, dosimetry systems need to be in place to monitor and measure the dose delivered to the human body, with instantaneous feedback. In radiotherapy treatments, the target volume is often a cancerous cell accumulation, surrounded by healthy tissues. In this case, margins of error to the target volume during exposure to ionising radiation become crucial in order to spare surrounding vital organs when large doses have the potential to permanent damaging. Furthermore, advancements of radiotherapy modalities that make use of high dose rates, smaller fields and x-ray imaging for image guided dose delivery mo

Towards high spatial resolution tissue-equivalent dosimetry for microb by Jessie A Posar, Matthew Large et al

Spatially fractionated ultra-high-dose-rate beams used during microbeam radiation therapy (MRT) have been shown to increase the differential response between normal and tumour tissue. Quality assurance of MRT requires a dosimeter that possesses tissue equivalence, high radiation tolerance and spatial resolution. This is currently an unsolved challenge. This work explored the use of a 500nm thick organic semiconductor for MRT dosimetry on the Imaging and Medical Beamline at the Australian Synchrotron. Three beam filters were used to irradiate the device with peak energies of 48, 76 and 88keV with respective dose rates of 3668, 500 and 209Gys-1. The response of the device stabilized to 30% efficiency after an irradiation dose of 30kGy, with a 0.5% variation at doses of 35kGy and higher. The calibration factor after pre-irradiation was determined to be 1.02±0.005μGy per count across all three X-ray energy spectra, demonstrating the unique advantage of using tissue-equivalent materials f

Hyperbaric Oxygen Therapy (HBOT) and it s treatment methodology for medical conditions

Hyperbaric Oxygen Therapy (HBOT) and it s treatment methodology for medical conditions
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Hyperbaric Oxygen Therapy (HBOT) and it s treatment

Hyperbaric Oxygen Therapy (HBOT) and it s treatment
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Seeking enhanced materials for nuclear reactors

Credits: Photo: Gretchen Ertl Next image One of India’s largest commercial and research nuclear reactor facilities lies just south of Arunkumar Seshadri’s hometown of Chennai, India. It was there, during a high school field trip, that the seeds of his interest in nuclear power were planted. “We learned the basic outline of how a reactor functions,” recalls Seshadri, a fifth-year doctoral student in nuclear science and engineering. “I was fascinated by how such a little bit of uranium or other fuel could produce such an enormous amount of energy.” This fascination quickly found a formal outlet during Seshadri’s undergraduate years, and continues to propel him now at MIT.

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