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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

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Estimation of thoron concentration using scintillation cell.

C G Sumesh¹, A Vinod Kumar, R N Nair

¹Environmental Assessment Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.

Radiation Protection Dosimetry

|January 7, 2012

Summary

This study presents two novel counting techniques for estimating thoron ((220)Rn) concentration using a Lucas scintillation cell. These methods offer accurate measurements for radon detection in industrial environments.

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Area of Science:

Nuclear Science and Engineering
Environmental Monitoring
Radiation Detection

Background:

Accurate measurement of thoron ((220)Rn) is crucial for radiation safety, especially in environments with thorium.
Existing methods for thoron detection may have limitations in sensitivity or applicability.

Purpose of the Study:

To propose and validate two new counting techniques for estimating thoron concentration.
To assess the performance of these techniques using a Lucas scintillation cell.

Main Methods:

Theoretical calculation of alpha activity build-up using Bateman equations within a Lucas scintillation cell.
Development of a first counting technique with a minimum detection limit of 325 Bq m(-3).
Development of a second counting technique utilizing alpha counts from thoron progenies, referenced to the first method.

Main Results:

The proposed techniques provide reliable estimates of thoron concentration.
The first method is suitable for thoron measurement in thorium-processing plants.
Results from both techniques show good agreement with the established double filter method.

Conclusions:

The developed counting techniques offer a viable approach for thoron concentration estimation.
These methods enhance the capabilities for monitoring thoron in specific industrial settings.
The findings support the use of these techniques as alternatives to existing methods.