Beryllium oxide nanoparticles: synthesis, characterization, and thermoluminescence evaluation for gamma radiation detection

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shadi Faraji ◽  
Shahzad Feizi ◽  
Amir Abbas Sabouri Dodaran ◽  
Anita Alipour ◽  
Parviz Ashtari ◽  
...  
Keyword(s):  
Particle Size ◽  
Gamma Radiation ◽  
Radiation Dosimetry ◽  
Radiation Detection ◽  
Absorbed Dose ◽  
Beryllium Oxide ◽  
Oxide Nanoparticles ◽  
Polymer Gel ◽  
Nanoparticles Synthesis

Abstract In this study, beryllium oxide nanoparticles (BeO NPs) were synthesized by polymer-gel method with schlenk line. The products were then assessed using FESEM, TGA/DSC, XRD and BET analyses. The quality of two nanooxides, that were calcined at 700 and 800 °C, was studied and compared with bulk BeO particles. The results showed that nanoparticles calcined at 800 °C were more uniform and had ellipsoidal morphology with a particle size of ∼35 nm. Investigation thermoluminescence (TL) characteristics of BeO NPs showed that with the decreasing exposed dose/increasing the BeO particle size, TL peaks were observed at higher temperatures. The intensities of glow curves increase linearly with the increasing absorbed dose in the range of 0.001 mGy–1000 Gy. Various other studies including response fading, minimum temperature and minimum time for annealing, and response changes in repeatability cycles of dosimeter also approved the ability of the prepared BeO NPs for use in gamma radiation dosimetry.

Superselective Radioembolization of Hepatocellular Carcinoma: 5-Year Results of a Prospective Study

1994 ◽  
Vol 33 (05) ◽  
pp. 206-214 ◽  
Author(s):  
J. Triller ◽  
H. U. Baer ◽  
Livia Geiger ◽  
H. F. Beer ◽  
C. Becker ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Survival Rates ◽  
Absorbed Dose ◽  
Pulmonary Complications ◽  
Pulmonary Shunt ◽  
Recurrent Tumour ◽  
Activity Distribution ◽  
A Prospective Study ◽  
Overall Survival Rates

SummaryTwenty patients with unresectable hepatocellular carcinoma (HCC) were followed up to 5 years after transarterial radiotherapy with 90Y-resin particles. Diagnostic radioembolizations of 99mTc-macroaggregates facilitated scintigraphic assessment of activity distribution, dose evaluation and final procedural verification. The overall survival rates were 56, 38 and 14% (after 1, 2 and 3 years, resp.). Patients with unifocal HCC and a single feeding artery (n = 7) even presented 83, 67 and 40% (2 alive after 2.75 and 4 years). With multiple arteries (n = 7), the longest survival was 26 months. Patients with multifocal HCC survived up to 33 months after selective radioembolization. Quality of life was improved in all. Survival was positively correlated with absorbed dose but residual/recurrent tumour occurred even after ≥300 Gy. Post-treatment symptoms were minimal (35 applications), pulmonary shunt rates were correctly predicted and pulmonary complications avoided.

MR Imaged Polymer Gel Radiation Dosimetry: Disclosed Yet Unpatented

2008 ◽  
Vol 1 (3) ◽  
pp. 203-212 ◽  
Author(s):  
Panagiotis Antoniou ◽  
Eleni Kaldoudi
Keyword(s):  
Radiation Dosimetry ◽  
Polymer Gel

scholarly journals The Influence of Extruded Sugar Beet Pulp on Cookies' Nutritional, Physical and Sensory Characteristics

2021 ◽  
Vol 13 (9) ◽  
pp. 5317
Author(s):  
Sonja Simić ◽  
Jovana Petrović ◽  
Dušan Rakić ◽  
Biljana Pajin ◽  
Ivana Lončarević ◽  
...  
Keyword(s):  
Particle Size ◽  
Sugar Beet ◽  
Dietary Fiber ◽  
Wheat Flour ◽  
Nutritional Quality ◽  
Sugar Beet Pulp ◽  
Sensory Characteristics ◽  
Total Dietary Fiber ◽  
Beet Pulp

Sugar beet pulp (SBP) is a by-product of the sugar industry in which the dietary fiber content ranges from 73% to 80%. Compared to cereal fibers mainly used in biscuit production, sugar beet fibers are gluten free and have a perfect ratio of 2/3 insoluble fiber. In this work, sugar beet pulp was extruded with corn grits (ratios of corn grits to sugar beet pulp in extrudates were 85:15, 70:30, and 55:45), and the obtained sugar beet pulp extrudates (SBPEs) were used for improving the nutritional quality of cookies. The wheat flour in cookies was replaced with SBPEs in the amount of 5, 10, and 15%. The influence of three factors (the percentage of sugar beet pulp in the SBPEs, the size of the SBPE particles, and the percentage of wheat flour substituted with SBPEs) and their interactions on the nutritional quality of cookies, as well as their physical and sensory characteristics are examined using the Box–Behnken experimental design. The addition of extruded sugar beet pulp (SBPEs) significantly increased the amount of total dietary fiber and mineral matter of cookies. On the whole, the addition of SBPEs increased cookie hardness, but the hardness decreased with an increase in extrudate particle size. Sensory characteristics (except for the taste) were the most influenced by extrudate particle size.

Gamma Radiation Dosimetry Characteristics of Hydrothermally Synthesized TiO2 Nanorods

2021 ◽  
Author(s):  
R. M. Sahani ◽  
Raghav Singhal ◽  
Naresh Jinger ◽  
Manjeet Kulhar ◽  
Arun Pandya ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Radiation Dosimetry ◽  
Tio2 Nanorods

scholarly journals Biodistribution and internal radiation dosimetry of a companion diagnostic radiopharmaceutical, [68Ga]PSMA-11, in subcutaneous prostate cancer xenograft model mice

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Su Bin Kim ◽  
In Ho Song ◽  
Yoo Sung Song ◽  
Byung Chul Lee ◽  
Arun Gupta ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Radiation Dosimetry ◽  
Xenograft Model ◽  
Absorbed Dose ◽  
Patient Specific ◽  
Internal Radiation ◽  
Washout Phase ◽  
Heterogeneous Tissue ◽  
Organ Level ◽  
Reported Data

Abstract[68Ga]PSMA-11 is a prostate-specific membrane antigen (PSMA)-targeting radiopharmaceutical for diagnostic PET imaging. Its application can be extended to targeted radionuclide therapy (TRT). In this study, we characterize the biodistribution and pharmacokinetics of [68Ga]PSMA-11 in PSMA-positive and negative (22Rv1 and PC3, respectively) tumor-bearing mice and subsequently estimated its internal radiation dosimetry via voxel-level dosimetry using a dedicated Monte Carlo simulation to evaluate the absorbed dose in the tumor directly. Consequently, this approach overcomes the drawbacks of the conventional organ-level (or phantom-based) method. The kidneys and urinary bladder both showed substantial accumulation of [68Ga]PSMA-11 without exhibiting a washout phase during the study. For the tumor, a peak concentration of 4.5 ± 0.7 %ID/g occurred 90 min after [68Ga]PSMA-11 injection. The voxel- and organ-level methods both determined that the highest absorbed dose occurred in the kidneys (0.209 ± 0.005 Gy/MBq and 0.492 ± 0.059 Gy/MBq, respectively). Using voxel-level dosimetry, the absorbed dose in the tumor was estimated as 0.024 ± 0.003 Gy/MBq. The biodistribution and pharmacokinetics of [68Ga]PSMA-11 in various organs of subcutaneous prostate cancer xenograft model mice were consistent with reported data for prostate cancer patients. Therefore, our data supports the use of voxel-level dosimetry in TRT to deliver personalized dosimetry considering patient-specific heterogeneous tissue compositions and activity distributions.

Effects of Flour Particle Size and Starch Damage on Processing and Quality of White Salted Noodles

2002 ◽  
Vol 79 (1) ◽  
pp. 64-71 ◽  
Author(s):  
D. W. Hatcher ◽  
M. J. Anderson ◽  
R. G. Desjardins ◽  
N. M. Edwards ◽  
J. E. Dexter
Keyword(s):  
Particle Size
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