M. Freitas

A. Almeida, M. Freitas, M. Almeida-Silva, 2011, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

Air pollution at an urban traffic tunnel in Lisbon, Portugal: an INAA study.

M. Freitas, N. Canha, M. Almeida-Silva, 2011, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

Selenium supplementation of Portuguese wheat cultivars through foliar treatment in actual field conditions

A. Almeida, M. Freitas, C. Galinha, 2013, Journal of Radioanalytical and Nuclear Chemistry.

Determination of selenium daily intakes in two small groups of the Portuguese population by replicate sample neutron activation analysis

M. Freitas, M. Ventura, A. Pacheco, 2009 .

Characterization of selenium-enriched wheat by agronomic biofortification

A. Almeida, M. Freitas, H. Wolterbeek, 2015, Journal of Food Science and Technology.

Chemical element accumulation in tree bark grown in volcanic soils of Cape Verde—a first biomonitoring of Fogo Island

M. Freitas, F. Rocha, M. Dias, 2017, Environmental Science and Pollution Research.

Elemental levels in tree-bark and epiphytic-lichen transplants at a mixed environment in mainland Portugal, and comparisons with an in situ lichen.

M. Freitas, A. Pacheco, M. Vasconcelos, 2008, Environmental pollution.

Are lower epiphytes really that better than higher plants for indicating airborne contaminants? An insight into the elemental contents of lichen thalli and tree bark by INAA

M. Freitas, A. Pacheco, 2004 .

Elemental characterization of bread and durum wheat by instrumental neutron activation analysis

M. Freitas, C. Galinha, Adriano M. G. Pacheco, 2013, Journal of Radioanalytical and Nuclear Chemistry.

INAA and PIXE for the determination of the contents of extractable sediment

M. Freitas, C. Hipólito, 2007 .

Comparison of continental Portugal and Azores Islands aerosol during a Sahara dust storm

M. Freitas, C. Pio, J. Soares, 2002 .

Assessment of bioaccumulation of REEs by plant species in a mining area by INAA

M. Freitas, N. Canha, I. Dionísio, 2012, Journal of Radioanalytical and Nuclear Chemistry.

Soils of Azores islands: elemental characterization with an emphasis on rare-earth elements

M. Freitas, Adriano M. G. Pacheco, 2010 .

Selenium characterisation of the Portuguese bread-wheat archival collection

A. Almeida, M. Freitas, H. Wolterbeek, 2015, Crop and Pasture Science.

Selenium in bread and durum wheats grown under a soil-supplementation regime in actual field conditions, determined by cyclic and radiochemical neutron activation analysis

A. Almeida, M. Freitas, H. Wolterbeek, 2015, Journal of Radioanalytical and Nuclear Chemistry.

Micro-scale elemental distribution in the thallus of Flavoparmelia caperata transplanted to polluted site

M. Freitas, H. Wolterbeek, M. Freitas, 2009 .

Radiotracing selenium in bread-wheat seeds for a Se-biofortification program: an optimization study in seed enrichment

A. Almeida, M. Freitas, A. Pacheco, 2011, Journal of Radioanalytical and Nuclear Chemistry.

Characterization of Portuguese geomaterials, the clay component of rañas, as potential liners for low and intermediate radioactive disposal sites

M. Freitas, A. Mateus, M. Gonçalves, 2010 .

Assessment of Lichen Vitality During a Transplantation Experiment to a Polluted Site

M. Freitas, H. Wolterbeek, R. Godinho, 2004 .

Spatial regression analysis between air pollution and childhood leukaemia in Portugal

M. Freitas, M. C. Freitas, M. Martinho, 2009 .

Joint assessment of responses of biomonitors to airborne nickel and vanadium through nuclear and non-nuclear techniques

M. Freitas, A. Pacheco, M. Vasconcelos, 2008 .

Correlating element atmospheric deposition and cancer mortality in Portugal: data handling and preliminary results.

M. Freitas, H. Wolterbeek, T. Verburg, 2008, Environmental pollution.

A nonparametric assessment of the relative output of INAA and PIXE on joint determinands in environmental samples (atmospheric biomonitors)

M. Freitas, M. Ventura, A. Pacheco, 2004 .

Trace-element measurements in atmospheric biomonitors—A look at the relative performance of INAA and PIXE on olive-tree bark

M. Freitas, M. Reis, A. Pacheco, 2003 .

An evaluation of olive-tree bark for the biological monitoring of airborne trace-elements at ground level.

M. Freitas, M. Reis, A. Pacheco, 2002, Environmental pollution.

Calibration of lichen transplants considering faint memory effects.

B. van Os, M. Freitas, H. Wolterbeek, 2002, Environmental pollution.

Gravimetric and Chemical Features of Airborne PM10 AND PM2.5 in Mainland Portugal

S. Almeida, M. Freitas, M. Ventura, 2005, Environmental monitoring and assessment.

Investigating tree bark as an air-pollution biomonitor by means of neutron activation analysis

M. Freitas, R. Figueira, A. Pacheco, 2001, Journal of Radioanalytical and Nuclear Chemistry.

Distribution in Portugal of some pollutants in the lichen Parmelia sulcata.

M. Freitas, H. Wolterbeek, M. Reis, 1999, Environmental pollution.

Bioaccumulation of heavy metals usingParmelia sulcata andParmelia caperata for air pollution studies

M. Freitas, A. Nobre, 1997 .

Response of exposed bark and exposed lichen to an urban area

M. Freitas, N. Canha, H. Wolterbeek, 2011 .

Anthropogenic sources of PM2.5’s arsenic, lead, mercury and nickel in northern metropolitan Lisbon, Portugal

M. Freitas, M. Ventura, A. Pacheco, 2004 .

Enrichment factors and transfer coefficients from soil to rye plants by INAA

M. Freitas, A. Pacheco, C. Galinha, 2010 .

Recent advances in the k0-standardization of neutron activation analysis: Extensions, applications, prospects

Borut Smodiš, F. De Corte, A. Simonits, 1993 .

Determination of ultratrace levels of selenium in fruit and vegetable samples grown and consumed in Portugal

M. Freitas, M. Ventura, V. Stibilj, 2009 .

Chemical elements in common vegetable components of Portuguese diets, determined by k0-INAA

M. Freitas, I. Dionísio, M. Ventura, 2006 .

Selenium Levels in Mainland Portugal

M. Freitas, M. Ventura, A. Pacheco, 2005 .

Using the exhaled breath condensate as a tool for non-invasive evaluation of pollutant exposure

S. Almeida, M. Freitas, S. Garcia, 2010 .

Preparation of a lichen reference material

M. Freitas, C. Branquinho, C. Máguas, 1993 .

AN ASSESSMENT OF THE RESPONSE OF TREE BARK AND EPIPHYTIC LICHENS TO ELEMENTAL AVAILABILITY AT GROUND LEVEL THROUGH NUCLEAR TECHNIQUES

M. Freitas, M. Ventura, M. Reis, 2001 .

Elemental bioaccumulators in air pollution studies

M. Freitas, 1995 .

Trace-Element Enrichment in Epiphytic Lichens and Tree Bark at Pico Island, Azores, Portugal

M. Freitas, A. Pacheco, Maria do Carmo Freitas, 2009, Journal of the Air & Waste Management Association.

Elemental characterization of a candidate lichen research material — IAEA-336

M. Freitas, R. Zeisler, S. F. Stone, 1995 .

Bioaccumulation of Cobalt in Parmelia sulcata

M. Freitas, A. Pacheco, 2004 .

Contribution of short irradiation instrumental neutron activation analysis to assess air pollution at indoor and outdoor environments using transplanted lichens

S. Almeida, M. Freitas, N. Canha, 2019, Journal of Radioanalytical and Nuclear Chemistry.

Indoor and Outdoor Biomonitoring Using Lichens at Urban and Rural Primary Schools

S. Almeida, M. Freitas, N. Canha, 2014, Journal of toxicology and environmental health. Part A.

Lichens as biomonitors at indoor environments of primary schools

S. Almeida, M. Freitas, N. Canha, 2011, Journal of Radioanalytical and Nuclear Chemistry.

Cell-membrane damage and element leaching in transplanted Parmelia sulcata lichen related to ambient SO2, temperature, and precipitation.

M. Freitas, H. Wolterbeek, A. Marques, 2005, Environmental science & technology.

Arsenic, antimony, and other trace element contamination in a mine tailings affected area and uptake by tolerant plant species

M. Freitas, N. Canha, H. M. Anawar, 2011, Environmental geochemistry and health.

Elemental concentrations of aerosols near Portuguese power plants by INAA and PIXE

M. Freitas, A. Pacheco, 2007 .

Trace elements in wild and orchard honeys.

M. Freitas, N. Canha, M. Almeida-Silva, 2011, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

Determination of selenium in food matrices by replicate sample neutron activation analysis

M. Freitas, A. Pacheco, M. G. Ventura, 2009 .

Copper, nickel and lead in lichen and tree bark transplants over different periods of time.

M. Freitas, A. Pacheco, M. Vasconcelos, 2008, Environmental pollution.

Interference from uranium fission products in the determination of rare earths, zirconium and ruthenium by instrumental neutron activation analysis in rocks and minerals

M. Freitas, M. Gouveia, E. Martinho, 1987 .

Re-characterization of irradiation facilities for k0-NAA at RPI after conversion to LEU fuel and re-arrangement of core configuration

M. Freitas, J. Marques, H. M. Dung, 2010 .

Development of the k0-based cyclic neutron activation analysis for short-lived radionuclides

D. Beasley, M. Freitas, M. Blaauw, 2012, Journal of Radioanalytical and Nuclear Chemistry.

Neutron flux and associated k0 parameters in the RPI after the last configuration change

S. Almeida, M. Freitas, C. Mustra, 2003 .

Aerosol Concentrations and Remote Sources of Airborne Elements Over Pico Mountain, Azores, Portugal

M. Freitas, I. Dionísio, A. Pacheco, 2009 .

Levels of iodine and other elements in drinking water across rural counties adjoining a former uranium mining and milling works, through short-time activation analysis

M. Freitas, A. Pacheco, B. Vieira, 2007 .

Different methodologies in neutron activation to approach the full analysis of environmental and nutritional samples

M. Freitas, I. Dionísio, Z. Révay, 2008 .

Calibration of gamma-ray spectrometers coupled to Compton suppression and fast pneumatic systems for the k0-standardized NAA method

D. Beasley, M. Freitas, M. Blaauw, 2008 .

Evaluation of atmospheric airborne particles in Lisbon, Portugal using neutron activation analysis

M. Freitas, S. Landsberger, B. Vieira, 2006 .

Impact of Sahara Dust Transport on Cape Verde Atmospheric Element Particles

S. Almeida, M. Freitas, M. Almeida-Silva, 2013, Journal of toxicology and environmental health. Part A.

Smoke emissions from biomass burning in a Mediterranean shrubland

M. Freitas, L. Tarelho, C. Pio, 2010 .

Measuring air particulate matter in large urban areas for health effect assessment

S. Almeida, M. Freitas, C. Pio, 2007 .

Approaching PM(2.5) and PM(2.5-10) source apportionment by mass balance analysis, principal component analysis and particle size distribution.

S. Almeida, M. Freitas, C. Pio, 2006, The Science of the total environment.

Adaptation, tolerance, and evolution of plant species in a pyrite mine in response to contamination level and properties of mine tailings: sustainable rehabilitation

M. Freitas, N. Canha, I. Santa-Regina, 2013, Journal of Soils and Sediments.

Sample preparation of aquatic macrophytes for analysis of minor-and trace-elements

M. Freitas, F. Corte, R. Cornelis, 1993 .

Determination of trace elements in reference materials by the k(0)-standardization method (INAA).

M. Freitas, E. Martinho, 1989, Talanta.

Neutron activation analysis of reference materials by the k0-standardization and relative methods

M. Freitas, E. Martinho, 1989 .

Accuracy and precision in instrumental neutron activation analysis of reference materials and lake sediments

M. Freitas, E. Martinho, 1989 .

The Aethalometer calibration and determination of iron concentration in dust aerosols

M. Freitas, A. Hansen, R. Honrath, 2006 .

Impact of wood burning on indoor PM2.5 in a primary school in rural Portugal

S. Almeida, M. Freitas, N. Canha, 2014 .

Selenium determination in cereal plants and cultivation soils by radiochemical neutron activation analysis

A. Almeida, M. Freitas, J. Kučera, 2012, Journal of Radioanalytical and Nuclear Chemistry.

Compton suppression instrumental neutron activation analysis performance in determining trace- and minor-element contents in foodstuff

M. Freitas, I. Dionísio, S. Landsberger, 2008 .

Outdoor/indoor air quality in primary schools in Lisbon: a preliminary study

S. Almeida, M. Freitas, T. Nunes, 2010 .

Children exposure to atmospheric particles in indoor of Lisbon primary schools

Margarita Evtyugina, Ana Maria Silva, Nuno Canha, 2011 .

Response of exposed detached lichens to atmospheric elemental deposition

M. Freitas, I. Dionísio, A. Pacheco, 2007 .

Bioaccumulation behaviour of transplants of the lichen Flavoparmelia caperata in relation to total deposition at a polluted location in Portugal.

M. Freitas, H. Wolterbeek, T. Verburg, 2008, Environmental pollution.

Some improvements in air particulate matter analysis by INAA

S. Almeida, M. Freitas, M. Reis, 2001 .

Combination of neutron activation, atomic absorption spectroscopy and conventional methods in the elemental analysis of silicate rocks

M. Freitas, M. Gouveia, M. J. Tavares, 1986 .

Association between atmospheric pollutants and hospital admissions in Lisbon

S. Almeida, M. Freitas, H. Wolterbeek, 2015, Environmental Science and Pollution Research.

Impact of Maritime Air Mass Trajectories on the Western European Coast Urban Aerosol

S. Almeida, M. Freitas, C. Pio, 2013, Journal of toxicology and environmental health. Part A.

The correction for γ-γ, γ-KX and γ-LX true-coincidences in k0-standardized NAA with counting in a LEPD

M. Freitas, F. Corte, 1992 .

The calibration of a low-energy photon germanium detector for use in the NAA kf0 standardization method

M. Freitas, F. Corte, A. Wispelaere, 1990 .

Determination of the level of some heavy metals in an aquatic ecosystem by instrumental neutronactivation analysis

M. Freitas, M. F. Reis, E. Martinho, 1988 .

On the fission interference correction and its dependence on the epithermal to thermal neutron flux ratio in thermal naa of molybdenum

M. Freitas, E. Martinho, 2007, Biological Trace Element Research.

Use of k0-NAA in the life sciences.

M. Freitas, F. Corte, A. Simonits, 1994 .

Determination of selenium in bread-wheat samples grown under a Se-supplementation regime in actual field conditions

A. Almeida, M. Freitas, A. Pacheco, 2011, Journal of Radioanalytical and Nuclear Chemistry.

Determination of phytoextraction potential of plant species for toxic elements in soils of abandoned sulphide-mining areas

M. Freitas, N. Canha, I. Dionísio, 2009 .

Seasonal variation of total particulate matter and children respiratory diseases at Lisbon primary schools using passive methods

Nuno Canha, Susana Marta Almeida, S. Almeida, 2011 .