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Dear Lv LiDan,

The submission of your abstract has been successfully processed.

Abstract submitted: https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts.

Status of your abstract: https://indico.cern.ch/event/192695/call- for-abstracts/257/.

See below a detailed summary of your submitted abstract:

Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics

Submitted by: LIDAN, Lv

Submitted on: 24 February 2014 15:09

Title: A method for production and control activity concentration of thoron progenies in the thoron reference chamber

Abstract content The long-term stability and homogeneity of activity concentration for thoron and its progenies are of great importance in a calibration facility,but this is difficult for a high stable activity concentration of thoron progenies due to longer life of 212Pb. In order to establish and maintain a high constant activity concentration of thoron progenies easily, the compensation system based on air circulation between a cylindrical chamber with 212Pb activity concentration over 10000 Bq.m-3 and the thoron reference chamber has been developed.The stable concentration of 212Pb in the cylindrical chamber depend on a constant solid 220Rn source and certain aerosol concentration level ranging from 1000 per cubic centimeter to 10000per cubic centimeter. Then dynamic balance of thoron progenies between the growth from the cylindrical chamber and the losses due to plate-out, decay and sampling in the thoron reference chamber has been established. A air flow of 20L•min-1 simulate sampling of calibrated instruments to eliminate concentration fluctuations caused by that in the thoron reference chamber. By this method 212Pb with wide various activity concentration ranging from 60 Bq•m-3 to 3000 Bq•m-3 are produced under different compensation and stimulation flow, and an overall uncertainty of less than 5% in the reference chamber. When concentration of thoron progenies changed from one level to another, it takes about ten hours to establishing new radioactive equilibrium.

Summary

Primary Authors: Prof. XIAO, Detao (University of South China) 13307478601@189.cn

Co-authors: Mr. HE, Zhengzhong (University of South China) 286573193@qq.com Mr. QIU, Shoukang (University of South China) hejia9zu@163.com

Abstract presenters: Prof. XIAO, Detao

Track classification: Sensors: 1e) Novel technologies

Presentation type: Oral

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