Photon Activation Analysis--An Analytical Application Of High-Energy Electron Accelerators

Journal Article · Tue Mar 10 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3120180· OSTI ID:21289674

Segebade, Christian R; Goerner, Wolf ^[1]

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1. Federal Institute of Materials Research and Testing Unter den Eichen 87, 12205 Berlin (Germany)

Photon activation analysis (PAA) was introduced about contemporarily with the other activation analysis methods (neutron, NAA, and charged particle activation, CPAA). Nonetheless, for different reasons, PAA has been applied less frequently than the other techniques mentioned. The incident photon energy should exceed about 12 MeV (except in some special rare applications) so as to obtain appreciably high activity yields of the product nuclides. Thus, cyclic electron accelerators (LINACs or microtrons) are used for activation preferably. The predominant photonuclear reaction is of the ({gamma},n)-type. Thus, normally neutron-deficient nuclides are produced. These usually emit gamma rays, annihilation quanta and characteristic X-ray fluorescence, all of whom can be used for analytical evaluation. The spectrometry equipment is the same as used for the other activation techniques (semiconductor detectors, sodium iodide crystals in coincidence geometry). Being uncharged high energy photons have a large penetration power, thus do not suffer from strong matrix absorption. Although not having a detection power as large as in NAA (in the most cases), PAA offers several further convincing advantages, e.g. several elements not or hardly detectable by NAA can be analysed: Titanium, nickel, thallium, lead, bismuth and, in particular, the light elements carbon, nitrogen, oxygen, fluorine, phosphorus. Several typical applications will be described.

• OSTI ID: 21289674
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1099; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BISMUTH
CARBON
COMPARATIVE EVALUATIONS
LEAD
LINEAR ACCELERATORS
MEV RANGE
MICROTRONS
MULTI-ELEMENT ANALYSIS
NAI DETECTORS
NEUTRON ACTIVATION ANALYSIS
NICKEL
NITROGEN
OXYGEN
PHOSPHORUS
PHOTON ACTIVATION ANALYSIS
PHOTONUCLEAR REACTIONS
QUANTITATIVE CHEMICAL ANALYSIS
THALLIUM
TITANIUM
X-RAY FLUORESCENCE ANALYSIS