Implications of the high voltage induced variation on TL readings.
The high voltage (HV) induced variation on the thermoluminescence (TL) and on the reference light (RL) intensity was investigated in a previous work, which also allowed for the definition of warning levels for all the parameters of the readers' start up test. Based on the results obtained, a modification of the start up procedure was suggested: 'a 10 min warm up time was allowed prior to the beginning of the reader's start up tests. The actual and previous HV values should differ less than +/-5 V. In case it exceeds, a second test should be performed. If the difference exceeds +/-10 V, the voltage should be manually adjusted to the previous value and a calibration of the reader is needed. Should this occur for more than two successive days, maintenance should be called'. The results of the readers' start up tests obtained since the implementation of the start up procedure are analysed and the warning levels considered are discussed. Charts of the HV-induced variation on the TL and RL readings were obtained, compared with the preliminary results and the implications on the start up procedure are discussed.
Alves
J G
JG
Instituto Tecnológico e Nuclear, Departamento de Protecção Radiológica e Segurança Nuclear, Estrada Nacional 10, 2686-953 Sacavém, Portugal. jgalves@itn.pt
Abrantes
J N
JN
Rangel
S
S
D016477:Artifacts; D002138:Calibration / Q000592:standards; D004560:Electricity; D004574:Electromagnetic Fields; D011174:Portugal; D011829:Radiation Dosage; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods*