Saccharomyces Cerevisiae as a Model Organism for Retrospective Impedance Biodosimetry
Health Phys. 2024 May 1;126(5):272-279. doi: 10.1097/HP.0000000000001815.ABSTRACTPrevious studies have shown that measuring changes in electrical impedance that follow radiation-induced suppression of metabolic activity in irradiated yeast cells can be used to determine radiation dose. The current work investigates the radiation response of Saccharomyces cerevisiae cells by using metabolic activity of cells as a damage indicator. Impedance biodosimetry was examined as a method to evaluate the radiation response of yeast cells. Active lab-grade dry yeast cells were used as the biological material as these samples are simple...
Source: Health Physics - March 25, 2024 Category: Physics Authors: Amna Hassan Kirk D Atkinson Source Type: research

A Perspective from Ontario Tech University Industrial Research Chairs on 20 Years of Capacity Building in Health Physics and Radiation Science
Health Phys. 2024 May 1;126(5):280-291. doi: 10.1097/HP.0000000000001786.ABSTRACTOntario Tech University (University of Ontario Institute of Technology) is one of Canada's newest universities, having been incorporated in 2002. In 20 y, the University has increased enrollment from a few hundred students to over 10,000. The University was designed to be "market driven" and as such offered courses that had high market demand. The Faculty of Energy Systems and Nuclear Science was one of the first faculties to be established at the University, with the intent to fill a gap between personnel that were retiring out of the nuclear...
Source: Health Physics - March 25, 2024 Category: Physics Authors: Edward Waller Kirk Atkinson Anthony Waker Source Type: research

3D Printed Lung Phantom for Individual Monitoring
Health Phys. 2024 May 1;126(5):292-295. doi: 10.1097/HP.0000000000001777.ABSTRACTThe Human Monitoring Laboratory, Health Canada (HML), has used a 3D printer to re-engineer its Lawrence Livermore National Laboratory (LLNL) foam lung sets (manufactured by Radiology Support Devices, Inc., Long Beach, CA). The foam sets are currently the HML standard for calibrating and performance testing lung-counting systems in Canada. This paper describes the process of creating and validating new 3D-printed lung sets modeled from one of the HML's existing RSD foam sets. The existing sets were custom made, making them costly and difficult ...
Source: Health Physics - March 25, 2024 Category: Physics Authors: Kevin Capello Marilyn Tremblay Aryanna Schiebelbein Noah Janzen Source Type: research

Factors Influencing Effects of Low-dose Radiation Exposure
Health Phys. 2024 May 1;126(5):296-308. doi: 10.1097/HP.0000000000001816.ABSTRACTIt is now well accepted that the mechanisms induced by low-dose exposures to ionizing radiation (LDR) are different from those occurring after high-dose exposures. However, the downstream effects of these mechanisms are unclear as are the quantitative relationships between exposure, effect, harm, and risk. In this paper, we will discuss the mechanisms known to be important with an overall emphasis on how so-called "non-targeted effects" (NTE) communicate and coordinate responses to LDR. Targeted deposition of ionizing radiation energy in cells...
Source: Health Physics - March 25, 2024 Category: Physics Authors: Carmel Mothersill Colin Seymour Alan Cocchetto David Williams Source Type: research

Optimizing the Positioning of Detectors for Improved Counting Efficiencies Using Monte Carlo Simulations
Health Phys. 2024 May 1;126(5):309-314. doi: 10.1097/HP.0000000000001794.ABSTRACTThe Human Monitoring Laboratory (HML) at Health Canada updated its whole-body counter with four new electrically cooled HPGe detectors. To optimize the counting efficiency of the new system, Monte Carlo simulation was used to model the whole-body counter using a reference BOMAB male phantom. The resulting modeled counting efficiencies showed that the best position to install the four new detectors could be obtained without performing laborious real measurements, thereby reducing the cost of preparing the BOMAB phantoms and reconfiguring the de...
Source: Health Physics - March 25, 2024 Category: Physics Authors: Kevin Capello Ryan Moffat Aryanna Schiebelbein Source Type: research

A Study on Geographic Correlation between Indoor Radon Exposure and Leukemia Incidence in Canada
In this study, geographical correlation between residential radon exposure and leukemia incidence was investigated at a provincial level with more accurate long-term radon measurement data in 21,330 homes and 10-y (2000-2009) age standardized incidence rates per 100,000 population for various subtypes of leukemia. The analyses showed that the incidence rate of non-Hodgkin lymphoma is statistically significantly correlated with average indoor radon (222Rn) concentration for Canadian females (p = 0.01210) but not for males. At a provincial level, the association between average indoor radon level and chronic lymphocytic leuk...
Source: Health Physics - March 25, 2024 Category: Physics Authors: Jing Chen Source Type: research

Electron Paramagnetic Resonance (EPR) Biodosimetry with Human Teeth: A Crucial Technique for Acute and Chronic Exposure Assessment
Health Phys. 2024 May 1;126(5):322-338. doi: 10.1097/HP.0000000000001822.ABSTRACTRadiation exposure is a primary concern in emergency response scenarios and long-term health assessments. Accurate quantification of radiation doses is critical for informed decision-making and patient care. This paper reviews the dose reconstruction technique using both X- and Q-bands, with tooth enamel as a reliable dosimeter. Tooth enamel, due to its exceptional resistance to alteration over time, offers a unique opportunity for assessing both acute and chronic radiation exposures. This review delves into the principles underlying enamel do...
Source: Health Physics - March 25, 2024 Category: Physics Authors: Lekhnath Ghimire Edward Waller Source Type: research

Improving Calculations of Electron Eye-lens Operational Dose Coefficients Using the Monte Carlo Codes PENELOPE and MCNP6.2
In this study, electron operational eye-lens dose coefficients were calculated using MCNP6.2 in its default settings and by invoking the single-event feature. The results were compared to those from PENELOPE, a well-known code for its enhanced accuracy in handling low-energy electron transport. The results are in agreement for the entire energy range for these two series of simulations, but differences are found with previously published dose coefficients in the literature. This impacts the calibration of dosimeters for electrons and may require a change in the commonly accepted dose coefficients.PMID:38526252 | DOI:10.109...
Source: Health Physics - March 25, 2024 Category: Physics Authors: Jacques Dubeau Jiansheng Sun Salah Djeffal Fawaz Ali Source Type: research

Canadian Radiation Protection Association (CPRA) 2023 Annual Conference Abstracts
Health Phys. 2024 May 1;126(5):346-358. doi: 10.1097/HP.0000000000001824.NO ABSTRACTPMID:38526253 | DOI:10.1097/HP.0000000000001824 (Source: Health Physics)
Source: Health Physics - March 25, 2024 Category: Physics Source Type: research

Health physics society . 2023 affiliate members
Health Phys. 2024 May 1;126(5):364. doi: 10.1097/01.HP.0001011180.09683.32.NO ABSTRACTPMID:38526256 | DOI:10.1097/01.HP.0001011180.09683.32 (Source: Health Physics)
Source: Health Physics - March 25, 2024 Category: Physics Source Type: research

The mechanism and kinetics of the atmospheric oxidation of CF < sub > 3 < /sub > (CF < sub > 2 < /sub > ) < sub > 2 < /sub > CH CH < sub > 2 < /sub > (HFC-1447fz) by hydroxyl radicals: < em > ab initio < /em > investigation
Phys Chem Chem Phys. 2024 Mar 25. doi: 10.1039/d3cp06149c. Online ahead of print.ABSTRACTThe oxidation of 3,3,4,4,5,5,5-heptafluoro-1-pentene (HFC-1447fz) by hydroxyl radicals plays a crucial role in atmospheric conditions. By employing the CCSD(T)/cc-pVTZ//M06-2X/6-311++G(d,p) level of theory, the detailed reaction mechanism, kinetics and atmospheric implications of the degradation of HFC-1447fz by hydroxyl radicals were investigated. Compared to H-abstraction channels, the OH addition reaction is determined to be more favorable initial pathways in the degradation processes of HFC-1447fz. The overall rate coefficient of t...
Source: Health Physics - March 25, 2024 Category: Physics Authors: Youqing Yu Li Pan Qiyao Sun Jie Wang Source Type: research

Addressing challenges in diagnostic X-ray dosimetry: uncertainties and corrections for Al < sub > 2 < /sub > O < sub > 3 < /sub > :C-based optically stimulated luminescent dosimeters
This study aims to develop a method to determine ED and ESFs of Landauer nanoDot™ OSLDs for clinical X-ray and investigate the uncertainties associated with ESF and ED correction factors. An area of 2 × 2 cm2 at the central axis of the X-ray field was used to establish the ESFs. A total of 80 OSLDs were categorized into "controlled" (n = 40) and "less-controlled" groups (n = 40). The ESFs of the OSLDs were determined using an 80 kVp X-ray beam quality in free-air geometry. The OSLDs were cross-calibrated with an ion chamber to establish the average calibration coefficient and ESFs. The OSLDs were then irradiated at tube...
Source: Health Physics - March 25, 2024 Category: Physics Authors: Jeannie Hsiu Ding Wong Wan Hazlinda Ismail Source Type: research

Development, reliability, and validity of the mobility assessment scale in hospitalized patients (HMob)
CONCLUSION: The HMob scale showed excellent internal consistency, intra- and inter-rater reliability, and concurrent validity in the motor domain, which suggests that it can be used in daily practice to measure mobility in hospitalized patients.PMID:38522390 | DOI:10.1016/j.bjpt.2024.101047 (Source: Health Physics)
Source: Health Physics - March 24, 2024 Category: Physics Authors: Isis Resende Ramos Joice Sousa Santos Maria Cecilia Pires Dos Santos Daruane Ferreira da Silva Iura Gonzalez Nogueira Alves Mansueto Gomes Neto Bruno Prata Martinez Source Type: research

A system dynamics approach to understand Dutch adolescents' sleep health using a causal loop diagram
CONCLUSIONS: The multi-actor CLD and identified system dynamics illustrate the complexity of adolescent sleep health and supports the need for developing a coherent package of activities targeting different leverage points at all system levels to induce system change.PMID:38519989 | PMC:PMC10958857 | DOI:10.1186/s12966-024-01571-0 (Source: Health Physics)
Source: Health Physics - March 23, 2024 Category: Physics Authors: Danique M Heemskerk Vincent Busch Jessica T Piotrowski Wilma E Waterlander Carry M Renders Maartje M van Stralen Source Type: research

Effects of Aerobic Exercise on Executive and Memory Functions in Patients With Alzheimer's Disease: A Systematic Review
CONCLUSION: The effects of aerobic exercise on aspects of executive function were mainly characterized by improvements in inhibitory control, working memory, and cognitive flexibility, whereas the effects on aspects of memory function were mainly characterized by improvements in logical memory, situational memory, and short-term memory.PMID:38521051 | DOI:10.1123/japa.2023-0292 (Source: Health Physics)
Source: Health Physics - March 23, 2024 Category: Physics Authors: Qiaoyou Luo Zuguo Tian Yuting Hu Chaochao Wang Source Type: research