In this paper, the results aimed at assessing the performance of two varieties of LiF detectors (LiF:Mg,Ti and LiF:Mg,Cu,P) in photon fields relatively to reproducibility, detection threshold and angular dependence as defined in the ISO 12794 standard are presented. The fading properties and the limit of detection were also investigated for both materials. The results suggest that both LiF varieties are well suited for extremity monitoring. However, better fading properties of LiF:Mg,Cu,P when compared with LiF:Mg,Ti, combined with previous results relatively to energy dependence suggests that LiF:Mg,Cu,P dosemeters are better suited for extremity monitoring.
Os distúrbios do ritmo cardíaco, também denominados arritmias
cardíacas, constituem um problema frequente em diversas faixas etárias
pediátricas e geralmente ocorrem por alterações no sistema de condução do
coração ou de lesões no próprio tecido cardíaco. As arritmias podem ser
subdivididas em bradiarritmias e taquiarritmias, de acordo com a frequência
cardíaca (FC) esperada para cada idade (Tabela 1), sendo a bradicardia
definida por uma frequência cardíaca abaixo do limite inferior esperado para
aquela faixa-etária, enquanto a taquicardia por uma frequência cardíaca acima
do limite superior (CASALE, 2018; MATSUNO 2012).
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