title: Measurement and Monte Carlo modelling of the JRC 241Am-Li(alpha,n) source spectrum.
abstract: The neutron energy spectrum of the JRC 241Am-Li(alpha,n) radionuclide source has been measured at the PTB in Germany using various spectrometry systems, such as Bonner spheres, proton recoil counters and NE213 liquid scintillators. The source photon spectrum has been measured and the neutron contamination due to traces of beryllium through the 9Be(alpha,n)12C reaction has been determined. The effects associated with source encapsulation and the materials it contains have been investigated previously, using Monte Carlo simulations, the various structures seen in the spectra have been explained and the anisotropy of fluence distributions in 4pi have been calculated and compared to measurements. These extensive high resolution spectrometry measurements have been coupled to Monte Carlo calculations to provide a realistic spectrum and new spectrum-averaged fluence-to-dose equivalent conversion coefficients for the actual 241Am-Li source.
authors.affiliation: The European Commission, Joint Research Centre, I-21020 Ispra (VA), Italy. hamid.tagziria@irc.it
authors.forename: H
authors.initials: H
authors.lastname: Tagziria
authors.forename: B
authors.initials: B
authors.lastname: Wiegel
authors.forename: H
authors.initials: H
authors.lastname: Klein
authors.forename: K
authors.initials: K
authors.lastname: Knauf
authors.forename: J
authors.initials: J
authors.lastname: Wittstock
authors.forename: A
authors.initials: A
authors.lastname: Zimbal
mesh_terms: D000576:Americium / Q000032:analysis*; D001822:Body Burden; D002138:Calibration / Q000592:standards; D003198:Computer Simulation; D017076:Computer-Aided Design; D019544:Equipment Failure Analysis / Q000295:instrumentation / Q000379:methods / Q000592:standards; D005858:Germany; D038622:Internationality; D008094:Lithium / Q000032:analysis*; D015233:Models, Statistical; D009010:Monte Carlo Method; D009502:Neutrons; D009688:Nuclear Reactors; D016273:Occupational Exposure / Q000032:analysis; D017785:Photons; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation / Q000379:methods* / Q000592:standards*; D011868:Radioisotopes / Q000032:analysis; D011874:Radiometry / Q000295:instrumentation / Q000379:methods* / Q000592:standards*; D012015:Reference Standards; D012062:Relative Biological Effectiveness; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity
chemical_list: D011868:Radioisotopes; D008094:Lithium; D000576:Americium