Avtor/Urednik		Rant, J; Nemec, T; Apih, V; Stade, J; Cluzeau, S
Naslov		Status of neutron radiology methods in the study of moisture in porous building materials and their perspectives in the conservation of historical monuments
Tip		članek
Vir		In: Preprints of the EC workshop on non-destructive testing to evaluate damage dur to environmental effects on historic monuments; 1996 Febr 15-17; Trieste. Trieste: Universita degli studi,
Leto izdaje		1996
Obseg		str. 1-10
Jezik		eng
Abstrakt		To detect and measure moisture a variety of neutron-based non-destructive examination and analytical methods exists which usefully complement other conventional NDT methods. These methods are based on all possible types of neutron interaction with matter: neutron scattering and moderation, neutron activation and neutron transmisaion. Nondestructive methods based on neutron transmission are neutron gauging and neutron imaging methods: neutron radiography, neutron radioscopy and computed neutron tomography. Other neutronbased techniques which have been applied to some non-destrnctive or analytical problems in CE are neutron activation analysis (NAA) and prompt gamma activation analysis (PGAA). For neutron imaging and gauging methods and analytical neutron examination techniques a broader term "neutron radiology methods" has been introdnced recently. In the paper neutron radiology methods in use for the detection and measurement of moisture in building materials are described. The status of both "in-the-field" and laboratory applications is briefly presented and their relevance to the application of historical monuments is discussed. Their moisture detection characteristics are compared with relevant characteristics of some other important non-nuclear moisture detection techniques. At the IJS Ljubljana TRIGA Reactor few applications of the neutron radiography and neutron radioscopy in the measurement of moisture profiles and moisture transport properties of porous building materials, both untreated and treated with hydrophobic coatings or imprcgn:tions have been performed and are shortly described. Future developments and perspective of some novel neutron based moisture measuring methods based on NCA and PGAA using small movable neutron generator and suitable for applications in the conservation of historical buildings are discussed.
Deskriptorji		MATERIALS TESTING RADIOGRAPHY NEUTRONS ARCHITECTURE ART