Article

The establishment of a portable high sensitivity exhaled thoron activity measurement system.

National Institute for Radiological Protection, 2 Xinkang Street, Deshengmenwai, Beijing 100088, People's Republic of China.
Journal of Radiological Protection (impact factor: 1.39). 07/2008; 28(2):195-204. DOI:10.1088/0952-4746/28/2/003
Source: PubMed

ABSTRACT A portable system, using electrostatic collection, for the measurement of exhaled thoron activity in humans is described, together with details of the basic theory, equipment, calibration procedures, measurement and preliminary use. The portable system built on experience at the Argonne National Laboratory (ANL) to achieve a reduction in measurement time from 30 h to 200 min, and to increase the total efficiency of the system from 50% (at ANL) to 70%. The limit of detection of the system (2sigma above zero) is 0.007 Bq of thoron activity outside the body. The total standard error of this system is 47% for a thorium lung burden of 0.22 Bq. The average background of this scintillation detector was 0.003 counts min(-1).

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Keywords

Argonne National Laboratory
 
basic theory
 
Bq
 
detection
 
electrostatic collection
 
exhaled thoron activity
 
humans
 
measurement time
 
portable system
 
preliminary use
 
scintillation detector
 
thorium lung burden
 
total standard error
 

Xing-An Chen