A re-examination of coincidence and gamma-peak doublet handling in Kayzero-based NAA

1999 ◽  
Vol 49 (S1) ◽  
pp. 287-293 ◽  
Author(s):  
S. Van Lierde ◽  
F. De Corte ◽  
D. Bossus ◽  
R. Van Sluijs
Keyword(s):  
Gamma Peak

Presence of neutrons in the low-level background environment estimated by the analysis of the 595.8 keV gamma peak

2017 ◽  
Vol 852 ◽  
pp. 80-84 ◽  
Author(s):  
Brankica Anđelić ◽  
David Knežević ◽  
Nikola Jovančević ◽  
Miodrag Krmar ◽  
Jovana Petrović ◽  
...  
Keyword(s):  
Low Level ◽  
Gamma Peak

scholarly journals Multiple myeloma revealed by a sphenoid plasmocytoma: case report and literature review

2016 ◽  
Vol 3 (2) ◽  
pp. 57-59
Author(s):  
Selma Kadiri
Keyword(s):  
Multiple Myeloma ◽  
Positive Staining ◽  
Resonance Imaging ◽  
Rare Presentation ◽  
Sphenoidal Sinus ◽  
Biological Studies ◽  
Plasma Cell Neoplasms ◽  
Gamma Peak ◽  
History Of ◽  
Magnetic Resonance Imaging Mri

Plasma cell neoplasms can manifest as a solitary or multiple plasmocytomas and may be associated with or progressing to multiple myeloma (MM). Cranial and intracranial plasmocytomas revealing multiple myeloma are very rare and only few cases are reported in the literature. We report the case of a sphenoid plasmocytoma that revealed a multiple myeloma in a 56 year-old woman with 3 months history of temporal headache and diplopia. Magnetic resonance imaging (MRI) and computed tomography (CT) showed a sphenoid mass. An endoscopic sphenoidal biopsy was performed and the histopathological exams showed a plasmocytoma with a positive staining for CD138. Further biological studies confirmed the diagnosis of multiple myeloma with a monoclonal gamma peak of immunoglobulin (Ig) A. The patient started systemic chemotherapy and received decompressive radiation therapy on the sphenoidal sinus. She remained in remission for 8 months and died from renal dysfunction. Although the sphenoid plasmocytoma is a very rare presentation of multiple myeloma it should be considered for effective patient management and prognosis improvement

Cs-137 Gamma Peak Detection in Snow Layers on Calderone Glacier

2001 ◽  
pp. 147-152 ◽  
Author(s):  
Antonella Balerna ◽  
Enrico Bernieri ◽  
Adolfo Esposito ◽  
Massimo Pecci ◽  
Claudio Smiraglia
Keyword(s):  
Peak Detection ◽  
Gamma Peak

scholarly journals Tissue and cellular distribution of the extended family of protein kinase C isoenzymes

1992 ◽  
Vol 117 (1) ◽  
pp. 121-133 ◽  
Author(s):  
WC Wetsel ◽  
WA Khan ◽  
I Merchenthaler ◽  
H Rivera ◽  
AE Halpern ◽  
...  
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Western Blot ◽  
Extended Family ◽  
Calcium Dependent ◽  
Kinase C ◽  
Pkc Epsilon ◽  
Pkc Zeta ◽  
Gamma Peak ◽  
Pkc Alpha

Polyclonal isoenzyme-specific antisera were developed against four calcium-independent protein kinase C (PKC) isoenzymes (delta, epsilon, epsilon', and zeta) as well as the calcium-dependent isoforms (alpha, beta I, beta II, and gamma). These antisera showed high specificities, high titers, and high binding affinities (3-370 nM) for the peptide antigens to which they were raised. Each antiserum detected a species of the predicted molecular weight by Western blot that could be blocked with the immunizing peptide. PKC was sequentially purified from rat brain, and the calcium-dependent forms were finally resolved by hydroxyapatite chromatography. Peak I reacted exclusively with antisera to PKC gamma, peak II with PKC beta I and -beta II, and peak III with PKC alpha. These same fractions, however, were devoid of immunoreactivity for the calcium-independent isoenzymes. The PKC isoenzymes demonstrated a distinctive tissue distribution when evaluated by Western blot and immunocytochemistry. PCK delta was present in brain, heart, spleen, lung, liver, ovary, pancreas, and adrenal tissues. PKC epsilon was present in brain, kidney, and pancreas, whereas PKC epsilon' was present predominantly in brain. PKC zeta was present in most tissues, particularly the lung, brain, and liver. Both PKC delta and PKC zeta showed some heterogeneity of size among the different tissues. PKC alpha was present in all organs and tissues examined. PKC beta I and -beta II were present in greatest amount in brain and spleen. Although the brain contained the most PKC gamma immunoreactivity, some immunostaining was also seen in adrenal tissue. These studies provide the first evidence of selective organ and tissue distributions of the calcium-independent PKC isoenzymes.

scholarly journals Cortical Oscillatory Dysrhythmias in Visual Snow Syndrome: A MEG Study

2021 ◽  
Author(s):  
Jenny L Hepschke ◽  
Robert A Seymour ◽  
Wei A He ◽  
Andrew Etchell ◽  
Paul F Sowman ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Brain Activity ◽  
Peak Frequency ◽  
Alpha Phase ◽  
Alpha Power ◽  
Gamma Peak ◽  
Gamma Power ◽  
Early Visual Cortex ◽  
Phase Amplitude

Visual Snow (VS) refers to the persistent visual experience of static in the whole visual field of both eyes. It is often reported by patients with migraine and co-occurs with conditions like tinnitus and tremor. The underlying pathophysiology of the condition is poorly understood. Previously we hypothesised, that VSS may be characterised by disruptions to rhythmical activity within the visual system. To test this, data from 18 patients diagnosed with visual snow syndrome (VSS), and 16 matched controls, were acquired using Magnetoencephalography (MEG). Participants were presented with visual grating stimuli, known to elicit decreases in alpha-band (8-13Hz) power and increases in gamma-band power (40-70Hz). Data were mapped to source-space using a beamformer. Across both groups, decreased alpha power and increased gamma power localised to early visual cortex. Data from primary visual cortex (V1) were compared between groups. No differences were found in either alpha or gamma peak frequency or the magnitude of alpha power, p>.05. However, compared with controls, our VSS cohort displayed significantly increased V1 gamma power, p=.035. This new electromagnetic finding concurs with previous fMRI and PET findings suggesting that in VSS, the visual cortex is hyper-excitable. The coupling of alpha-phase to gamma amplitude (i.e., phase-amplitude coupling, PAC) within V1 was also quantified. Compared with controls, the VSS group had significantly reduced alpha-gamma PAC, p<.05, indicating a potential excitation-inhibition imbalance in VSS, as well as a potential disruption to top-down 'noise-cancellation' mechanisms. Overall, these results suggest that rhythmical brain activity in primary visual cortex is both hyperexcitable and disorganised in VSS, consistent with visual snow being a condition of thalamocortical dysrhythmia.

scholarly journals Ammonium Fluoride Passivation of CdZnTeSe Sensors for Applications in Nuclear Detection and Medical Imaging

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3271 ◽  
Author(s):  
Stephen U. Egarievwe ◽  
Utpal N. Roy ◽  
Carmella A. Goree ◽  
Benicia A. Harrison ◽  
Jeanette Jones ◽  
...  
Keyword(s):  
Medical Imaging ◽  
Leakage Current ◽  
Gamma Ray ◽  
Surface Passivation ◽  
Ammonium Fluoride ◽  
Cryogenic Cooling ◽  
Gamma Peak ◽  
Potential Applications ◽  
Chemical Passivation ◽  
Effect Of Surface

Cadmium zinc telluride selenide (Cd1−xZnxTe1−ySey or CZTS) is one of the emerging CdTe-based semiconductor materials for detecting X- and gamma-ray radiation at or near room temperature (i.e., without cryogenic cooling). Potential applications of CZTS sensors include medical imaging, X-ray detection, and gamma-ray spectroscopy. Chemical passivation of CZTS is needed to reduce the conductivity of Te-rich surfaces, which reduces the noise and improves the device performance. In this study, we focus on the effect of surface passivation of CZTS using a 10% aqueous solution of ammonium fluoride. The effects of the chemical treatment were studied on the leakage current, charge transport measured as the electron mobility-lifetime (µτ) product, and the spectral resolution measured as the full-width at half-maximum (FWHM) of specific peaks. After passivation, the leakage current increased and began to decrease towards pre-passivation levels. The energy resolutions were recorded for eight applied voltages between −35 V and −200 V. The results showed an average of 25% improvement in the detector’s energy resolution for the 59.6 keV gamma peak of Am-241. The electron µτ product was unchanged at 2 × 10−3 cm2/V. These results show that ammonium fluoride is effective for chemical passivation of CZTS detectors.

Sign in / Sign up

Export Citation Format

Share Document