Feasibility study for distributed dose monitoring in ionizing radiation environments with standard and custom-made optical fibers

2002 ◽  
Author(s):  
Marco Van Uffelen ◽  
Francis Berghmans ◽  
Benoit Brichard ◽  
Paul Borgermans ◽  
Marc C. Decreton
Keyword(s):  
Ionizing Radiation ◽  
Feasibility Study ◽  
Optical Fibers ◽  
Dose Monitoring ◽  
Custom Made

scholarly journals Epidural needle with embedded optical fibers for spectroscopic differentiation of tissue: ex vivo feasibility study

2011 ◽  
Vol 2 (6) ◽  
pp. 1452 ◽  
Author(s):  
Adrien E. Desjardins ◽  
Benno H.W. Hendriks ◽  
Marjolein van der Voort ◽  
Rami Nachabé ◽  
Walter Bierhoff ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Optical Fibers ◽  
Ex Vivo ◽  
Epidural Needle

scholarly journals Characterization of a Y-Coupler and Its Impact on the Performance of Plastic Optical Fiber Links

Fibers ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 96 ◽  
Author(s):  
Alicia López ◽  
M. Losada ◽  
Javier Mateo ◽  
N. Antoniades ◽  
Xin Jiang ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Power Distribution ◽  
Glass Fibers ◽  
Single Mode ◽  
Transmission Properties ◽  
Modal Power ◽  
Custom Made ◽  
Plastic Optical Fibers ◽  
The Impact

Couplers and splitters are common devices in single-mode and multi-mode glass fibers applications, where they perform a variety of functions. However, when switching to plastic optical fibers (POFs), there is a shortage of commercial devices, which are usually custom-made. The problem with these devices is that modal power distribution in POFs is easily modified by spatial disturbances that produce a localized strong power transfer between modes, thus changing their transmission properties. In this work, a commercial Y-coupler designed for POFs is experimentally characterized. Measurements of its spectral, spatial and temporal characteristics have been performed, including insertion loss as a function of wavelength, angular power distribution, and frequency response. The obtained results show that this device has an equalizing effect over the power spatial distribution that reduces the fiber bandwidth, demonstrating the importance of considering the impact of this type of devices on the transmission properties of any POF system.

Effect of ionizing radiation on in situ Raman scattering and photoluminescence of silica optical fibers

1995 ◽  
Vol 42 (1) ◽  
pp. 7-11 ◽  
Author(s):  
T.G. Bilodeau ◽  
K.J. Ewing ◽  
G.M. Nau ◽  
I.D. Aggarwai
Keyword(s):  
Ionizing Radiation ◽  
Raman Scattering ◽  
Optical Fibers ◽  
In Situ Raman

scholarly journals Computer-Tomographic Verification of Ultrasound-Guided Piriformis Muscle Injection: A Feasibility Study

2014 ◽  
Vol 6;17 (6;12) ◽  
pp. 507-513 ◽  
Author(s):  
Gustavo Fabregat
Keyword(s):  
Botulinum Toxin ◽  
Ionizing Radiation ◽  
Feasibility Study ◽  
Health Care Providers ◽  
Lumbar Pain ◽  
Care Providers ◽  
Piriformis Muscle ◽  
Ultrasound Guided ◽  
Iodinated Contrast ◽  
Piriformis Muscle Syndrome

Background: Approximately 6% to 8% of lumbar pain cases, whether associated with radicular pain or not, may be attributed to the presence of piriformis muscle syndrome. Available treatments, among others, include pharmacotherapy, physical therapy, and injections of different substances into the muscle. Various methods have been used to confirm correct needle placement during these procedures, including electromyography (EMG), fluoroscopy, computed tomography (CT), or magnetic resonance imaging (MRI). Ultrasonography (US) has now become a widely used technique and therefore may be an attractive alternative for needle guidance when injecting this muscle. Objective: The objective of this study was to assess the reliability of US in piriformis injection of patients with piriformis syndrome. Study Design: Feasibility study; 10 patients with piriformis muscle syndrome were injected with botulinum toxin A using a US-guided procedure. Then patients were administered 2 mL iodinated contrast and were then transferred to the CT scanner, where they underwent pelvic and hip imaging to assess intramuscular distribution of the iodinated contrast. Setting: Multidisciplinary Pain Management Department in Spain. Results: Of all 10 study patients (8 women, 2 men), 9 had intramuscular or intrafascial contrast distribution. Distribution did not go deeper than the piriformis muscle in any of the patients. The absence of contrast (intravascular injection) was not observed in any case. Limitations: The main limitation of our study is the use of ionizing radiation as confirmation technique. Conclusion: Ultrasound-guided puncture may be a reliable and simple procedure for injection of the piriformis muscle, as long as good education and training are provided to the operator. US has a number of advantages over traditional approaches, including accessibility and especially no ionizing radiation exposure for both health care providers and patients. Key words: Piriformis, ultrasound-guidance, CT, pain, chronic pain, ultrasonography, botulinum toxin, sciatica

scholarly journals Spectrophotometric high-precision seawater pH determination for use in underway measuring systems

2011 ◽  
Vol 8 (3) ◽  
pp. 1339-1367 ◽  
Author(s):  
S. Aßmann ◽  
C. Frank ◽  
A. Kötzinger
Keyword(s):  
Optical Fibers ◽  
Anthropogenic Impacts ◽  
Ph Sensor ◽  
Measurement Systems ◽  
Stability Robustness ◽  
Seawater Ph ◽  
Custom Made ◽  
Moderate Cost ◽  
The Impact ◽  
Carbon System

Abstract. Autonomous sensors are required for a comprehensive documentation of the changes in the marine carbon system and thus to differentiate between its natural variability and anthropogenic impacts. Spectrophotometric determination of pH – a key variable of the seawater carbon system – is particularly suited to achieve precise and drift-free measurements. However, available spectrophotometric instruments are not suitable for integration into automated measurement systems (e.g. FerryBox) since they do not meet the major requirements of reliability, stability, robustness and moderate cost. Here we report on the development and testing of a new indicator-based pH sensor that meets all of these requirements. This sensor can withstand the rough conditions during long-term deployments on ships of opportunities and is applicable on the open ocean as well as in coastal waters with complex background and highly variable conditions. The sensor uses a high resolution CCD spectrometer as detector connected via optical fibers to a custom-made cuvette designed to reduce the impact of air bubbles. The sample temperature can be precisely adjusted (25 °C ± 0.006 °C) using computer-controlled power supplies and Peltier elements thus avoiding the widely used water bath. The overall setup achieves a measurement frequency of 1 min−1 with a precision of ± 0.0007 pH units and an average offset of +0.0018 pH units to a pH reference during shipboard operation. Application of this sensor allows monitoring of seawater pH in autonomous underway systems, providing a key variable for characterization and understanding the marine carbon system.

scholarly journals Assessment of Environmental Radiation Hazard on Public Health around BSMMU Campus, Dhaka, Bangladesh

2020 ◽  
Vol 8 (1) ◽  
pp. 9-15
Author(s):  
Faria Hassan ◽  
M. S. Rahman ◽  
Shafi M Tareq ◽  
S. Yeasmin
Keyword(s):  
Public Health ◽  
Ionizing Radiation ◽  
Real Time ◽  
Radiation Monitoring ◽  
Radiation Hazard ◽  
Acquisition Time ◽  
Monitoring Device ◽  
Lifetime Cancer Risk ◽  
Monitoring Point ◽  
Dose Monitoring

Objective: Medical institution uses ionizing radiation for diagnosis or treatment by using ionizing radiation generating equipment such as X-ray machines, CT, PET scan, etc. and radioactive materials especially in nuclear medicine centers. The purpose of the study is to monitor the real-time radiation around the Bangabandhu Sheikh Mujib Medical University (BSMMU) campus of Bangladesh for minimizing the ionizing radiation hazard on public health and the environment. Method: The radiation monitoring was performed using a real-time portable digital radiation monitoring device. This real-time digital portable radiation monitoring device meets all European CE standards as well as the American “FCC 15 standard”. The portable radiation monitoring device was placed at 1 meter above the ground on the tripod and data acquisition time for each monitoring point (MP) was 1 hour. 32 MPs were selected for the collection of radiation dose rates around the BSMMU campus from March-May 2019. Results: The measured dose rate around the BSMMU campus ranged from 0.02-3.15 µSv/hr with an average of 1.452 ± 0.883 µSv/hr. The annual effective dose was ranged from 0.117 ± 0.058 mSv to 5.445 ± 0.045 mSv with an average of 2.54 ± 1.566 mSv. The excess lifetime cancer risk (ELCR) was estimated which ranged from 4×10ˆ-4 to 2×10ˆ-2 with an average value of 1×10ˆ-2 for 32 selected locations around BSMMU campus. Conclusion: Dose monitoring helps to ensure the best possible protection of the radiation workers, patients, and the general public and provides an immediate indication of incorrect use of technical parameters or equipment malfunction. Not only that, but it is also essential to use an adequate amount of protective shielding for minimizing radiation hazard on public health and the environment from the scattering radiation of the hospital.

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