scholarly journals Intercomparison of Gamma Cell 220 Irradiator Facilities and Dr. Mirzan T Razzak Gamma Irradiators Using Harwell Dosimeters

2021 ◽  
Vol 15 (1) ◽  
pp. 13
Author(s):  
Bimo Saputro
Keyword(s):  
Quality Assurance ◽  
Genetic Engineering ◽  
Medical Equipment ◽  
Performance Test ◽  
Dose Range ◽  
Absorbed Dose ◽  
Food Irradiation ◽  
Technical Document ◽  
Measuring Instrument ◽  
Irradiation Facilities

The gamma irradiator is a multi-purpose facility that possibly used to preserve food, sterilize medical equipment, and conduct genetic engineering and polymerization processes, during which the absorbed dose of the product is critical. The standardization of product quality assurance was regulated by the IAEA Technical Document Number 409 considering Dosimetry for Food Irradiation and ISO 14470 and 11137-3 on Food Irradiation, as well as the Guidance on Dosimetric Aspects of Development, Validation, and Routine Control, respectively. The absorbed dose was influenced by the movement of the product to the source, its position, the amount of radioactive activity in the facility, and the dose rate in the irradiation room. The dosimeter performance test and quality assurance of the system were conducted using the Facility Intercomparison Technique which tested the dosimeter (measuring instrument) at 2 different facilities to determine the performance of the measuring instrument.. In this study, 2 irradiation facilities were tested using a Harwell routine dosimeter in the dose range of 1 kGy to 30 kGy and  20 dose points. The results showed that the highest deviation reached 19% and 21% at the Gamma Cell 220 and the Dr. Mirzan T Razzak Gamma irradiator facilities. This elevated the performance of the dosimeters to determine the precision accuracy of the dose-measuring instrument.

scholarly journals Quality assurance in a rehabilitation service

2001 ◽  
Vol 57 (1) ◽  
pp. 7-11 ◽  
Author(s):  
H. Myezwa ◽  
V. R. P. M'kumbuzi ◽  
F. Mhuri
Keyword(s):  
Quality Assurance ◽  
Patient Satisfaction ◽  
Service Providers ◽  
Linear Increase ◽  
Rehabilitation Service ◽  
Clinical Documentation ◽  
Measuring Instrument ◽  
Rehabilitation Outcomes ◽  
Midlands Province ◽  
One Year

Aim: The aim of this study was to develop, implement and evaluate a Quality Assurance (QA) programme for use by nine rehabilitation departments in the Midlands province of Zimbabwe.Methodology: A participatory methodology was implemented to:1. Define and implement the parameters of quality for a rehabilitation service.2. Design standardised assessment forms for the different conditions managed.3. Develop, pilot and evaluate a QA measuring instrument to use in defining the QA profile of a rehabilitation service, and4. Determine patient satisfaction with the rehabilitation service. Administering a simple questionnaire, whose design was based on the Zimbabwe Patients Charter, accomplished this.Results: The process of developing, implementing and evaluation of the QA programme took six years. One year after implementation of the QA, all (J00%) patients coming into contact with the service had a rehabilitation record. The QA profile for the Midlands province rose from 55% in 1994 to a record high of 92.1% in 1998, and 89.4% in 1999. The patient satisfaction profile for each indicator also demonstrated a linear increase with areas such as satisfaction with service rising from 86% in 1997 to 100% in 2000, and satisfaction with benefit from the service rising from 76.6% in 1997 to 100% in 2000. Other qualitative benefits not depicted by the QA measuring instrument or the patient satisfaction instrument, but which were observed and expressed by rehabilitation staff as measures of success of the QA programme are discussed.Conclusion: This paper concludes that significant improvements in clinical documentation arising from the QA programme, translated to an overall increase in the service providers’ professional skills and knowledge base, and ultimately rehabilitation outcomes. The success of this process is attributed to its participatory and empowering nature.

Is your healthcare organisation using sound quality assurance principles? Part 2: coping with the unexpected

2020 ◽  
Vol 26 (1) ◽  
pp. 44-47
Author(s):  
John Michael Collins
Keyword(s):  
Quality Assurance ◽  
Medical Equipment ◽  
Sound Quality ◽  
International Organization ◽  
Iso 9001 ◽  
Healthcare Organisation ◽  
Medical Implants ◽  
The Past ◽  
International Organization For Standardization ◽  
Medication Delivery

This is the second article in a two-part series that proposes how healthcare organisations could implement a quality assurance approach based on the requirements of a thus far unwritten healthcare modification of the 2015 International Organization for Standardization (ISO 9001). This second article will address the issue of unexpected failures of manufactured medical implants and medication delivery devices. Issues facing the quality assured supply of medical equipment, as well as the failure of implants during fitting or use and the failure or malfunction of powered syringes or drips, is discussed. At the end of the article, a list of self-audit questions is proposed to allow readers to make an assessment of how their own organisation has responded to the failure of medical implants or devices in the past, and whether action has been taken to prevent any problems reoccurring.

Radiation induced degradation of murexide dye in two media for possible use in dosimetric applications

2019 ◽  
Vol 48 (6) ◽  
pp. 540-546 ◽  
Author(s):  
Sameh Mohamed Gafar ◽  
Nehad Magdy Abdel-Kader
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Absorbed Dose ◽  
Chemical Yield ◽  
Radiation Sensitivity ◽  
Industrial Applications ◽  
Food Irradiation ◽  
Radiation Chemical ◽  
Content Type ◽  
Wide Range

Purpose The purpose of this paper is to study the effect of gamma-rays on murexide (Mx) dye and its possible use as radiation dosimeters in two different dosimetry systems. The first system depends on the Mx dye as a liquid dosimeter. The second dosimetry system depends also on the same dye but as in a gel form, which is more sensitive to gamma-rays. Design/methodology/approach The prepared Mx (solutions/gels) have a considerable two peaks at 324 and 521 nm that upon irradiation, the intensity of these peaks decreases with the increasing radiation dose. Findings The gamma-ray absorbed dose for these dosimeters was found to be up to 2 kGy for the solution samples and 40 Gy for the gels. Radiation chemical yield, dose response function, radiation sensitivity and before and after-irradiation stability under various conditions were discussed and studied. Practical implications It is expected that the radiolysis of the Mx dye can be used as radiation dosimeters in two different dosimetry systems; liquid and gel dosimeters. This can be applied in a wide range of gamma radiation practical industrial applications in water treatment, food irradiation dosimeters, radiotherapy and fresh food irradiation and seed production. Originality/value Both of the prepared Mx dyes, either as solutions or gel samples, can be facilely prepared from commercially, cheap, safe, available chemicals and suitable for useful applied Mx solutions and gels radiation dosimeters.

Dosimetric evaluation of methyl red radiochromic film for radiation processing

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Awad AL Zahrany ◽  
Khalid Rabaeh ◽  
Molham Eyadeh ◽  
Ahmed Basfar
Keyword(s):  
Gamma Ray ◽  
Dose Range ◽  
Absorbed Dose ◽  
Radiochromic Film ◽  
High Dose ◽  
Methyl Red ◽  
Radiation Processing ◽  
Content Type ◽  
The Stability ◽  
The Impact

Purpose The purpose of this paper is to present a radiochromic film dosimeter containing polyvinyl alcohol (PVA) matrix and various concentrations of methyl red (MR) dye for high dose measurements. Design/methodology/approach The MR-PVA films were exposed to irradiation up to 60 kGy using 60Co source of gamma ray. The ultraviolet and visible regions (UV/VIS) spectrophotometry were used to examine the optical density of pre-and post-irradiated dosimeters at 424 nm. Findings The dose sensitivity of MR-PVA films increases significantly with increasing MR dye concentrations in the dose range of 5 to 60 kGy. The impact of relative humidity, irradiation temperature, dose rate and the stability of the films has been analyzed. The overall uncertainty of the MR-PVA film dosimeter is 6.12% (Double Standard-deviation, 95% confidence level). Practical implications It was found that the MR-PVA films may be used as high dose dosimeter with an acceptable overall uncertainty in routine industrial radiation processing. Originality/value The color bleaching of irradiated MR-PVA films in terms of specific absorbance curves increases significantly with increasing absorbed dose up to 60 kGy.

scholarly journals Gamma radiolytic stability of CyMe4BTBP and the effect of nitric acid

Nukleonika ◽  
2015 ◽  
Vol 60 (4) ◽  
pp. 879-884 ◽  
Author(s):  
Holger Schmidt ◽  
Andreas Wilden ◽  
Giuseppe Modolo ◽  
Jaroslav Švehla ◽  
Bohumir Grüner ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Degradation Products ◽  
Dose Range ◽  
Absorbed Dose ◽  
Initial Distribution ◽  
Nitrogen Donor Ligand ◽  
Nitrogen Donor ◽  
Radiolytic Stability ◽  
Organic Solutions

Abstract The highly selective nitrogen donor ligand CyMe4BTBP for An(III) separation by solvent extraction was irradiated in a 60Co γ-source under varying conditions. Organic solutions of 10 mmol/L ligand in 1-octanol were contacted with different concentrations of nitric acid to observe the influence of an aqueous phase during irradiation. In subsequent liquid-liquid extraction experiments, distribution ratios of 241Am and 152Eu were determined. Distribution ratios decreased with increasing absorbed dose when irradiation was performed in the absence of nitric acid. With addition of nitric acid, initial distribution ratios remained constant over the whole examined dose range up to 300 kGy. For qualitative determination of radiolysis products, HPLC-MS measurements were performed. The protective effect of nitric acid was confirmed, since in samples irradiated with acid contact, no degradation products were observed, but only addition products of the 1-octanol molecule to the CyMe4BTBP molecule.

scholarly journals Development of optical fibers for food irradiation dosimeter

2019 ◽  
Vol 15 (1) ◽  
pp. 109-111
Author(s):  
Hamiza Ahmad Tajuddin ◽  
Wan Muhamad Saridan Wan Hassan ◽  
Siti Fairus Abdul Sani ◽  
Siti Aiasah Hashim
Keyword(s):  
Electron Beam ◽  
Food Safety ◽  
Optical Fibers ◽  
Dose Range ◽  
Radiation Detector ◽  
Food Irradiation ◽  
Consumer Confidence ◽  
High Dose ◽  
Linear Dose ◽  
Irradiated Foods

Different technologies and methods for enhancing food quality have been developed and applied in the last few decades. One of the latest technologies is by using ionizing radiation. Food irradiation is the technology that improves the safety and extends the shelf life of food by reducing or eliminating harmful microorganisms and insects. In order to provide for food safety, proper control or radiation detector of irradiated food seems very critical to facilitate international trade of irradiated foods and to enhance consumer confidence. In present studies, germanium-doped (Ge-doped) optical fibers of various form and dimensions were used as radiation detector. The fibers were irradiated using electron beam (EPS 3000), with doses from 1 kGy up to 10 kGy, exceeding the dose range of all commercial high dose dosimeters used in food irradiation industry. A study has been made of linearity, reproducibility, and fading. The fibers show a linear dose response over the studied range doses with mean of reproducibility less than 5 % variation between 1st exposure and 2nd exposure. TL fading of Ge-doped flat fibers has been found to be < 8.7%.

scholarly journals 224. Performance Test Using Newly-developped Multifunctional Measuring Instrument

1993 ◽  
Vol 49 (8) ◽  
pp. 1249
Author(s):  
F. Yonekura ◽  
Y. Miyagi ◽  
K. Takatu ◽  
N. Satou ◽  
Y. Sudou
Keyword(s):  
Performance Test ◽  
Measuring Instrument

Possible use of food grade Isomalt material as an EPR dosimeter

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Asmaa Sobhy ◽  
Moshira El-Kelany ◽  
Mohamed Sadek Taher ◽  
Hasanat G. Bader
Keyword(s):  
Gamma Rays ◽  
Dose Range ◽  
Absorbed Dose ◽  
Humidity Effect ◽  
Paramagnetic Resonance ◽  
Food Grade ◽  
Dose Monitoring ◽  
Short And Long Term ◽  
Electron Paramagnetic

Abstract The feasibility of using Isomalt “the food grade substance” as electron paramagnetic resonance (EPR) material in monitoring the absorbed dose has been studied. Isomalt was prepared in two forms (powder and rods). The sensitivity of Isomalt to gamma rays exceeded by increasing the absorbed dose. The prepared powder can be used in monitoring the absorbed dose in the dose range up to 22 kGy, whereas the rods can be used in the range from 5 to 50 kGy (almost double the allowed powder range). After irradiation two signals were recorded using the EPR technique addressed as S1 and S2 with (g) factor valued by 2.01 ± 0.002 and 1.993 ± 0.002 respectively. This dosimeter offers negligible humidity effect during irradiation, short and long term stabilities were investigated as well. The obtained results may qualify the Isomalt substance to be used as dose monitoring in low and moderate irradiation doses.

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