June 28, 2021 to July 2, 2021
Europe/Vienna timezone

Installation for the measurement of low activities of 37Ar based on the detection of liquid argon scintillation

O3.2-654
Jul 1, 2021, 4:50 PM
15m
Location 2 (Online)

Location 2

Online

Oral T3.2 - Laboratories Including Transportable and Field Based Facilities T3.2 - Laboratories Including Transportable and Field Based Facilities

Speaker

Mr Sergei Pakhomov (Khlopin Radium Institute, St. Petersburg, Russian Federation)

Description

One of the most conclusive evidences of a violation of CTBT is the presence in the subsoil air of elevated concentrations of 37Ar radionuclide, which is formed in large quantities in the interaction of neutrons with calcium in rocks.
Traditionally, to measure the activity of 37Ar, proportional gas counters are used, which are filled with a counting gas prepared from samples of argon with the addition of methane. Further reduction of the detection limit of 37Ar is limited by the difficulty of a significant increase of argon sample volume placed in a proportional counter.
Installation for the detection of argon-37 low activities based on the liquid scintillation principle was developed at the Khlopin Radium Institute under contract with the CTBTO. The role of the scintillator in this installation is performed by the liquefied preparation of extracted from soil air argon itself. The use of liquefied argon samples allows one to multiply the volume of the measured samples without increasing the size of the measuring cell and shield elements, and allows significant reduction of detection limits of 37Ar.
The presentation contains a description of the installation and the results obtained after its testing.

Promotional text

One of the main objectives of the conference is to identify opportunities and possible solutions for the continuous improvement of the control and verification of nuclear tests. The theme of our presentation is fully consistent with the achievement of this goal.

Primary author

Mr Sergei Pakhomov (Khlopin Radium Institute, St. Petersburg, Russian Federation)

Co-authors

Ms Tatiana Kuzmina (Khlopin Radium Institute, St. Petersburg, Russian Federation) Ms Ekateryna Kurysheva (Khlopin Radium Institute, St. Petersburg, Russian Federation) Mr Gennady Shakhetov (Khlopin Radium Institute, St. Petersburg, Russian Federation)

Presentation materials