In vivo measurement of calcium by the <sup>37</sup>Ar method: a study of the effect of recirculating breath collection systems on the exhalation rate
M O Leach; C M J Bell; B J Thomas; J T Dabek; H M James; D R Chettle; J H Fremlin; M O Leach; Dept. of Phys. & Dept. of Experimental Pathology, Univ. of Birmingham, Birmingham, UK; C M J Bell; Dept. of Phys. & Dept. of Experimental Pathology, Univ. of Birmingham, Birmingham, UK; B J Thomas; Dept. of Phys. & Dept. of Experimental Pathology, Univ. of Birmingham, Birmingham, UK; J T Dabek; Dept. of Phys. & Dept. of Experimental Pathology, Univ. of Birmingham, Birmingham, UK; H M James; Dept. of Phys. & Dept. of Experimental Pathology, Univ. of Birmingham, Birmingham, UK; D R Chettle; Dept. of Phys. & Dept. of Experimental Pathology, Univ. of Birmingham, Birmingham, UK; J H Fremlin; Dept. of Phys. & Dept. of Experimental Pathology, Univ. of Birmingham, Birmingham, UK
Журнал:
Physics in Medicine and Biology
Дата:
1978-03-01
Аннотация:
A study has been made of the effect that different methods of breath collection have on the measurement of calcium in vivo by the <sup>40</sup>Ca(n, alpha )<sup>37</sup>Ar method. The effect of open and rebreathing breath collection methods has been examined by using intravenous injections of <sup>133</sup>Xe. This study has indicated that comparison of calcium measurements between individuals and between centres is likely to be accurate only if breath is collected on 'open circuit'.
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