Advertisement

Topics

Measurements of thorium and uranium daughters in radioenvironmental samples using γγ-coincidence spectrometry.

08:00 EDT 23rd August 2018 | BioPortfolio

Summary of "Measurements of thorium and uranium daughters in radioenvironmental samples using γγ-coincidence spectrometry."

We present the performance of a γγ-coincidence spectrometer for measuring the activities of thorium and uranium daughters in environmental samples. The spectrometer consists of two NaI(Tl) detectors facing each other inside a low-background passive shield. We present coincidence gating schemes for achieving the best signal-to-noise ratios, coincidence detection efficiencies, background levels, and minimum detectable activities. The spectrometer is simulated using Geant4 to correct sample efficiencies for self-absorption effects. The device is used to measure thorium and uranium daughter activities in Brazil nuts, potting mix, and magazine paper. Our results for Brazil nuts agree with some, but not all, previous measurements. Thorium or uranium daughter activities have previously not been reported for commercial potting mix. For magazine paper, our measured activities are lower than most previously determined values.

Affiliation

Journal Details

This article was published in the following journal.

Name: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine
ISSN: 1872-9800
Pages: 24-32

Links

DeepDyve research library

PubMed Articles [8993 Associated PubMed Articles listed on BioPortfolio]

Estimation of uranium concentration in Indian monazite samples by using HPGe semiconductor detector.

Various techniques are available for the estimation of uranium concentration in geological rock samples. In the uranium exploration program in India, the beta-gamma technique is widely used by the Ato...

Comparison of solvent extraction and extraction chromatography resin techniques for uranium isotopic characterization in high-level radioactive waste and barrier materials.

The development of Deep Geological Repositories (DGP) to the storage of high-level radioactive waste (HLRW) is mainly focused in systems of multiple barriers based on the use of clays, and particularl...

A survey of uranium levels in urine and hair of people living in a coal mining area in Yili, Xinjiang, China.

Recent reports have drawn attention to the uranium contamination arising from coal mining activities in the Yili region of Xinjiang, China due to the mixed distribution of uranium and coal mines, and ...

Portable X-ray fluorescence system to measure Th and U concentrations.

This study reports the results obtained in the analysis of waste material samples generated by the industries of phosphate fertilizers, in particular, the use of specific filters in a portable X-ray f...

Uranium content in groundwater by laser fuorimetry. method validation and dose assessment.

In this study, the total uranium concentration was determined in groundwater samples used for irrigation and/or drinking purposes collected from private wells in Al Sharqiya region, Saudi Arabia. The ...

Clinical Trials [3605 Associated Clinical Trials listed on BioPortfolio]

The Communication of Genetic Risk to Adolescent Daughters of Women With Breast Cancer

The purpose of this study is to first understand how MSKCC Clinical Genetics Service doctors talk to women with breast cancer about any genetic risks they might carry, and if they help wo...

Mothers With a History of Depression and Their 10-14 Year Old Daughters

The purpose of this study is to investigate risk factors associated with depression and how such factors might be transmitted cross-generationally. The investigators are conducting an inte...

Vax Facts Human Papillomavirus (HPV): Study of a Computer-based Tailoring System and Mothers' Intentions to Vaccinate Their Daughters Against HPV

The goal of this study is to determine whether a two-page print brochure that delivers individually tailored educational messages about the Human papillomavirus (HPV) vaccine increases HPV...

Engaging Moms on Teen Indoor Tanning Through Social Media

A sample of mothers in Tennessee are recruited to a group-randomized pretest-posttest controlled trial evaluating the effect of a social media campaign to decrease mothers' permissiveness ...

Prospective Evaluation of the StatusFirst™ CHF NT-proBNP Device in Human Whole Blood and Plasma Samples

The primary objective of the study is to establish the correlation between NT-proBNP measurements in fresh human whole blood samples and those in plasma samples from the same study subject...

Medical and Biotech [MESH] Definitions

Thorium. A radioactive element of the actinide series of metals. It has an atomic symbol Th, atomic number 90, and atomic weight 232.04. It is used as fuel in nuclear reactors to produce fissionable uranium isotopes. Because of its radioopacity, various thorium compounds are used to facilitate visualization in roentgenography.

Inorganic compounds that contain thorium as an integral part of the molecule.

Thorium oxide (ThO2). A radiographic contrast agent that was used in the early 1930s through about 1954. High rates of mortality have been linked to its use and it has been shown to cause liver cancer.

Inorganic compounds that contain uranium as an integral part of the molecule.

Uranium. A radioactive element of the actinide series of metals. It has an atomic symbol U, atomic number 92, and atomic weight 238.03. U-235 is used as the fissionable fuel in nuclear weapons and as fuel in nuclear power reactors.

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Searches Linking to this Article