Applicability of a Commercially Available Active Extremity Dose-Rate Meter to Eye Lens Dose Monitoring

2021 ◽  
Author(s):  
Munehiko Kowatari ◽  
Hayo Zutz ◽  
Oliver Hupe
Keyword(s):  
Complete Characterization ◽  
Low Energy ◽  
Eye Lens ◽  
Dose Equivalent ◽  
Energy Photon ◽  
Eye Lens Dose ◽  
Dose Monitoring ◽  
Area Monitoring ◽  
Additional Monitoring

Abstract A commercially available active extremity dosemeter is a promising candidate for medical staff aid individual monitoring of the eye lens. We investigated the applicability of the newly developed active extremity dosemeter, which uses a low-energy photon probe, to eye lens dose monitoring by performing a complete characterization of the dosemeters. Performance tests revealed that the active extremity dosemeter would overestimate personal dose equivalent, Hp(3), when the probe is worn close to the lens of the eye of a medial worker without any improvement in the response. Introducing an appropriate filter into the probe for low-energy photon has proven to improve the response. The dosemeter then satisfies the criteria of the personal dosemeter for eye lens dosimetry and can be applicable to individual monitoring of eye lens dose. This article also discusses the applicability of the dosemeter to area monitoring for decision making regarding additional monitoring of the eye lens and the extremities.

Surgeon eye lens dose monitoring in catheterization lab: A multi-center survey

2019 ◽  
Vol 60 ◽  
pp. 127-131 ◽  
Author(s):  
Margherita Betti ◽  
Lorenzo Nicola Mazzoni ◽  
Giacomo Belli ◽  
Luca Bernardi ◽  
Sara Bicchi ◽  
...  
Keyword(s):  
Eye Lens ◽  
Eye Lens Dose ◽  
Dose Monitoring

A single hole in a quantum antiferromagnet: selfconsistent Green’s function approach

1991 ◽  
Vol 05 (01n02) ◽  
pp. 207-217 ◽  
Author(s):  
Gerardo Martínez ◽  
Peter Horsch
Keyword(s):  
Born Approximation ◽  
Complete Characterization ◽  
Exact Diagonalization ◽  
Low Energy ◽  
Spin Polaron ◽  
Two Dimensional ◽  
Effective Masses ◽  
Single Hole ◽  
Quantum Antiferromagnet

We solved numerically the integral equation for the selfenergy which describes the motion of a single hole in a two-dimensional quantum antiferromagnet (AF) within the selfconsistent Born approximation. This formulation stresses the similarity of the AF-spin polaron with the standard polaron problem. We confine our calculation to finite cluster geometries and compare with results from previous exact diagonalization studies. The spectral function is characterized by a narrow quasiparticle (qp) peak at the low energy side of the spectra, which appears to be well separated from the incoherent band part for large enough J values. For small J we find a reduced width of ~7t for the incoherent band. The bottom of the coherent qp band always occurs at (±π/2, ±π/2). Its bandwidth initially increases with J until J≃t and then decreases as 2t2/J. A complete characterization of our solution is given, including the dispersion relation and effective masses of this quasiparticle. The comparison with exact diagonalization studies for a 4×4 cluster is remarkably good. From our results we see that a lattice of 16×16 sites describes adequately the thermodynamic limit. We conclude that the simple Born approximation is a valuable scheme to characterize the dynamics of one hole in the t-J model. both in the perturbative and the strong coupling regimes.

Structural properties of ultra-low-energy ion-implanted silicon studied by combined X-ray scattering methods

2006 ◽  
Vol 39 (4) ◽  
pp. 571-581 ◽  
Author(s):  
L. Capello ◽  
T. H. Metzger ◽  
V. Holý ◽  
M. Servidori ◽  
A. Malachias
Keyword(s):  
Structural Characterization ◽  
Bragg Reflection ◽  
Complete Characterization ◽  
Low Energy ◽  
Diffuse Intensity ◽  
Near Surface ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

The use of a combination of X-ray scattering techniques for the complete characterization of ultra-low-energy (E< 5 keV) implanted Si is discussed. Grazing incidence diffuse X-ray scattering (GI-DXS) reveals the properties of the defects confined within thin crystalline layers with depth resolution. Due to the weak diffuse intensity arising from such defects, the high brilliance of synchrotron radiation is required. GI-DXS proved to be particularly well suited for the investigation of the so-called `end-of-range' defects. In a complementary way, X-ray diffraction (XRD) in the vicinity of the 004 Bragg reflection is sensitive to the distribution of the strain in the Si lattice in the direction perpendicular to the sample surface. The structural characterization is complemented by the electron density profile of the near-surface amorphous region provided by specular reflectivity (SR). It will be shown that only by merging the results obtained with GI-DXS, XRD and SR, is it possible to obtain the detailed structural characterization of the implanted Si samples.

WALL THICKNESS OPTIMISATION OF AN IONISATION CHAMBER FOR DIRECTIONAL DOSE EQUIVALENT RATE MEASUREMENT AT LOW AND MEDIUM PHOTON ENERGIES

2018 ◽  
Vol 183 (4) ◽  
pp. 469-474
Author(s):  
Sunil K Singh ◽  
M S Kulkarni
Keyword(s):  
Wall Thickness ◽  
Interventional Cardiology ◽  
Calibration Coefficient ◽  
Eye Lens ◽  
Energy Response ◽  
Dose Equivalent ◽  
Dose Monitoring ◽  
Paramedical Staff ◽  
Equivalent Rate ◽  
Ionisation Chamber

Abstract A thin and plane wall ionisation chamber having 900 cc volume was designed and fabricated to study the calibration coefficient dependency on ionisation chamber wall thickness for directional dose equivalent rate (Ḣ′(d)) at various low and medium energy X-ray beam qualities. Optimised wall thickness was established through measurements to achieve a near flat energy response using the developed ionisation chamber. The measurement shows that in the energy range 12–213 keV, the average calibration coefficient for directional dose equivalent rate lies within ±10% for wall thickness 1.2 mg/cm2 and 480 mg/cm2 (4 mm poly methyl methacrylate) for skin and eye lens dose monitoring, respectively. The study could be useful for the estimation of skin and eye lens doses for the paramedical staff and patient during the interventional radiology and interventional cardiology procedures by monitoring the directional dose equivalent rate.

SHOULD PERSONNEL OF NUCLEAR MEDICINE DEPARTMENTS USE PERSONAL DOSIMETERS FOR EYE LENS DOSE MONITORING?

2018 ◽  
Vol 183 (3) ◽  
pp. 393-396 ◽  
Author(s):  
Hanna Piwowarska-Bilska ◽  
Aleksandra Supinska ◽  
Jacek Iwanowski ◽  
Bozena Birkenfeld
Keyword(s):  
Nuclear Medicine ◽  
Eye Lens ◽  
Eye Lens Dose ◽  
Dose Monitoring

A systematic characterization of the low-energy photon response of plastic scintillation detectors

2016 ◽  
Vol 61 (15) ◽  
pp. 5569-5586 ◽  
Author(s):  
Jonathan Boivin ◽  
Sam Beddar ◽  
Chris Bonde ◽  
Daniel Schmidt ◽  
Wesley Culberson ◽  
...  
Keyword(s):  
Low Energy ◽  
Scintillation Detectors ◽  
Energy Photon ◽  
Plastic Scintillation

A correlation study of eye lens dose and personal dose equivalent for interventional cardiologists

2013 ◽  
Vol 157 (4) ◽  
pp. 561-569 ◽  
Author(s):  
J. Farah ◽  
L. Struelens ◽  
J. Dabin ◽  
C. Koukorava ◽  
L. Donadille ◽  
...  
Keyword(s):  
Correlation Study ◽  
Eye Lens ◽  
Dose Equivalent ◽  
Eye Lens Dose

OCCUPATIONAL RADIATION EXPOSURE OF THE EYE IN NEUROVASCULAR INTERVENTIONAL PHYSICIAN

2019 ◽  
Vol 185 (2) ◽  
pp. 151-156 ◽  
Author(s):  
Mamoru Kato ◽  
Koichi Chida ◽  
Takato Ishida ◽  
Hideto Toyoshima ◽  
Yasuyuki Yoshida ◽  
...  
Keyword(s):  
Interventional Radiology ◽  
Radiation Protection ◽  
Eye Lens ◽  
Digital Subtraction ◽  
Dose Equivalent ◽  
Correct Evaluation ◽  
Occupational Radiation Exposure ◽  
Actual Measurement ◽  
Eye Lens Dose ◽  
Occupational Radiation

Abstract Neurovascular interventional radiology (neuro-IR) procedures tend to require an extended fluoroscopic exposure time and repeated digital subtraction angiography. To evaluate the actual measurement of eye lens dose using a direct eye dosemeter in neuro-IR physicians is important. Direct dosimetry using the DOSIRIS™ (IRSN, France) [3 mm dose equivalent, Hp(3)] was performed on 86 cases. Additionally, a neck personal dosemeter (glass badge) [0.07 mm dose equivalent, Hp(0.07)] was worn outside the protective apron to the left of the neck. The average doses per case of neuro-IR physicians were 0.04 mSv/case and 0.02 mSv/case, outside and inside the radiation protection glasses, respectively. The protective effect of radiation protection glasses was approximately 60%. The physician eye lens dose tended to be overestimated by the neck glass badge measurements. A correct evaluation of the lens dose [Hp(3)] using an eye dosemeter such as DOSIRIS™ is needed for neuro-IR physicians.

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