title: ENVIRONMENTAL MONITORING WITH PASSIVE DETECTORS AT CTN IN PORTUGAL.
abstract: The aim of this work is to present the methods in use for environmental dose assessment with passive detectors at Campus Tecnológico e Nuclear (CTN) of Instituto Superior Técnico, in Portugal. The methods are based on LiF:Mg,Ti (TLD-100) detectors inserted in Harshaw holders placed at four locations and exchanged on a quarterly basis. An initial group of measurements allowed the estimation of the time interval necessary to attain a stable value, the determination of a fading factor, as well as the calculation method for the assessment of the ambient dose equivalent rate.
authors.affiliation: Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), EN 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal mnfpereira@ctn.ist.utl.pt.
authors.forename: M F
authors.initials: MF
authors.lastname: Pereira
authors.affiliation: Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal.
authors.forename: J
authors.initials: J
authors.lastname: Pereira
authors.affiliation: Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal.
authors.forename: S
authors.initials: S
authors.lastname: Rangel
authors.affiliation: Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal.
authors.forename: M
authors.initials: M
authors.lastname: Saraiva
authors.affiliation: Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal.
authors.forename: L M
authors.initials: LM
authors.lastname: Santos
authors.affiliation: Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal.
authors.forename: J V
authors.initials: JV
authors.lastname: Cardoso
authors.affiliation: Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), EN 10 (ao km 139,7), Bobadela LRS 2986-066, Portugal.
authors.forename: J G
authors.initials: JG
authors.lastname: Alves
mesh_terms: D002138:Calibration; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D005459:Fluorides / Q000737:chemistry; D006801:Humans; D018020:Lithium Compounds / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D011174:Portugal; D011829:Radiation Dosage; D000072232:Radiation Dosimeters; D011834:Radiation Monitoring / Q000295:instrumentation* / Q000379:methods; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods; D013997:Time Factors; D014025:Titanium / Q000737:chemistry
chemical_list: D018020:Lithium Compounds; C027651:lithium fluoride; D014025:Titanium; D008274:Magnesium; D005459:Fluorides