Artigo de peri??dico
Design, fabrication and modeling of an AmBe neutron irradiator for TLD screening for neutron dose measurement in mixed radiation fields
Registro en:
0969-8043
150
10.1016/j.apradiso.2019.05.009
0000-0003-4023-236X
0000-0002-6318-6805
0000-0003-4817-5275
0000-0003-2281-5756
33.036
43.00
Autor
CAVALIERI, TASSIO A.
SIQUEIRA, PAULO T.D.
SHORTO, JULIAN M.B.
GENEZINI, FREDERICO A.
YORIYAZ, HELIO
Resumen
TLDs dosimeters are frequently presented as a viable choice for dosimetric studies when dealing with mixed
neutron-gamma radiation fields. However, this choice is not without some drawbacks, because not only TLD
response is highly dependent on particle type but also on neutron energy spectrum. Therefore, a correct
screening and calibration of the dosimeter are required, and a simple shift from gamma screening methodology
for mixed field is not suitable. This paper presents the design, fabrication and tests of an irradiator for TLD
screening for neutron dose measurement using an AmBe source and polyethylene as moderator material. The
design of the irradiator was conducted through Monte Carlo simulations using the MCNP5 code. The experimental
validation and tests were performed using Indium activation foils and TLD 600 dosimeters. The manufactured
irradiator demonstrated to be suitable for TLD screening under neutron source radiation field, offering
very good homogeneity conditions in the radiation field so to guarantee same radiation dose delivered to the
TLDs.