High radioactivity levels of radium isotopes in groundwater of the Disi aquifer

2019 ◽  
Vol 322 (3) ◽  
pp. 1995-2001
Author(s):  
A. Al-Qararah ◽  
O. Al-Qudah ◽  
S. Alameer ◽  
O. Nusair
Keyword(s):  
Radium Isotopes ◽  
High Radioactivity ◽  
Radioactivity Levels

Evaluation of 99mTc-Label led Vitamin K4 as an Agent for Testicular Imaging

1991 ◽  
Vol 30 (01) ◽  
pp. 35-39 ◽  
Author(s):  
H. S. Durak ◽  
M. Kitapgi ◽  
B. E. Caner ◽  
R. Senekowitsch ◽  
M. T. Ercan
Keyword(s):  
Soft Tissue ◽  
Room Temperature ◽  
Normal Subjects ◽  
Left Testis ◽  
Wide Range ◽  
Activity Ratios ◽  
The Right ◽  
Radioactivity Levels

Vitamin K4 was labelled with 99mTc with an efficiency higher than 97%. The compound was stable up to 24 h at room temperature, and its biodistribution in NMRI mice indicated its in vivo stability. Blood radioactivity levels were high over a wide range. 10% of the injected activity remained in blood after 24 h. Excretion was mostly via kidneys. Only the liver and kidneys concentrated appreciable amounts of radioactivity. Testis/soft tissue ratios were 1.4 and 1.57 at 6 and 24 h, respectively. Testis/blood ratios were lower than 1. In vitro studies with mouse blood indicated that 33.9 ±9.6% of the radioactivity was associated with RBCs; it was washed out almost completely with saline. Protein binding was 28.7 ±6.3% as determined by TCA precipitation. Blood clearance of 99mTc-l<4 in normal subjects showed a slow decrease of radioactivity, reaching a plateau after 16 h at 20% of the injected activity. In scintigraphic images in men the testes could be well visualized. The right/left testis ratio was 1.08 ±0.13. Testis/soft tissue and testis/blood activity ratios were highest at 3 h. These ratios were higher than those obtained with pertechnetate at 20 min post injection.99mTc-l<4 appears to be a promising radiopharmaceutical for the scintigraphic visualization of testes.

SOME EFFECTS OF PERCHLORATE ON THE DISTRIBUTION OF 131-IODIDE

1965 ◽  
Vol 50 (2) ◽  
pp. 195-201 ◽  
Author(s):  
E. Schönbaum ◽  
E. A. Sellers ◽  
M.J. Gill
Keyword(s):  
Urinary Excretion ◽  
Renal Excretion ◽  
Kidney Tissue ◽  
Intraperitoneal Dose ◽  
Blood Radioactivity ◽  
Radioactivity Levels

ABSTRACT The distribution of an intraperitoneal dose of 131-iodide was studied in rats receiving perchlorate. The accumulation of radioactivity in the stomach, which occurred soon after injection in controls, was inhibited by perchlorate. Concurrent with this, radioactivity in blood was higher in perchlorate treated rats than in controls. After perchlorate, more radioactivity in kidney tissue and an elevated urinary excretion of the tracer was noted. After 24 hours, plasma radioactivity was lower in perchlorate treated rats than in controls. Increased renal excretion of 131I after perchlorate is, at least in part, due to higher blood radioactivity levels, probably because of decreased iodide space due to the action of perchlorate.

Natural radioactivity levels and radiological implications in the high natural radiation area of Wadi El Reddah, Egypt

2021 ◽  
Vol 327 (2) ◽  
pp. 643-652
Author(s):  
A. F. Tawfic ◽  
Hesham M. H. Zakaly ◽  
Hamdy A. Awad ◽  
Hesham R. Tantawy ◽  
Akbar. Abbasi ◽  
...  
Keyword(s):  
Natural Radioactivity ◽  
Natural Radiation ◽  
Radiation Area ◽  
Radioactivity Levels

scholarly journals Copper-64-Labeled Antibody Fragments for Immuno-PET/Radioimmunotherapy with Low Renal Radioactivity Levels and Amplified Tumor-Kidney Ratios

ACS Omega ◽  
2021 ◽  
Author(s):  
Hiroyuki Suzuki ◽  
Shota Kise ◽  
Yuta Kaizuka ◽  
Reo Watanabe ◽  
Tsubasa Sugawa ◽  
...  
Keyword(s):  
Antibody Fragments ◽  
Radioactivity Levels
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