External exposure of deciduous tooth enamel to photons: dose conversion coefficients for standard radiation fields.
Dose conversion coefficients for teeth of children were computed for external photon sources by means of Monte Carlo methods using a modified MIRD-type mathematical phantom of a 5-year-old child. The tooth region is separated into eight smaller regions that represent incisors, canines, first and second molars. Each of these sub-regions is separated into enamel and dentin parts. Dose conversion coefficients were computed as ratio of absorbed dose in the enamel and air kerma. They are given for unidirectional (AP, PA, RLAT, LLAT), rotational (ROT) and isotropic (ISO) photon sources in the energy range from 10 keV to 10 MeV. All computations were performed with the MCNP4 code including coupled electron-photon transport. The computed coefficients demonstrate a significant non-linearity versus photon energy, which is more pronounced than that observed for adult phantoms. Due to this non-linearity, use of the EPR-measured doses in human teeth requires information on the incident photon fluence spectra. The data presented can be used for assessment of public exposure.
Ulanovsky
A
A
GSF-Forschungszentrum für Umwelt und Gesundheit, GmbH, Ingolstädter Landstrasse 1, Neuherberg, Germany. ulanovsky@gsf.de
Wieser
A
A
D001681:Biological Assay / Q000379:methods*; D002648:Child; D003198:Computer Simulation; D003743:Dental Enamel / Q000502:physiology* / Q000528:radiation effects*; D004307:Dose-Response Relationship, Radiation; D004781:Environmental Exposure / Q000032:analysis*; D006801:Humans; D008954:Models, Biological; D009010:Monte Carlo Method; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000379:methods*
Radiat Prot Dosimetry. 2001;95(2):101-8
11572637
Ann ICRP. 1996;26(3-4):1-205
9105539
Radiat Environ Biophys. 2006 Mar;44(4):273-7
16432745
J Nucl Med. 1999 Aug;40(8):1327-36
10450685
J Nucl Med. 1999 Mar;40(3):62S-101S
10086719
Phys Med Biol. 2002 Jul 21;47(14):2367-85
12171328
Radiat Environ Biophys. 1996 Nov;35(4):305-10
9008008
Radiat Environ Biophys. 2006 Mar;44(4):279-88
16456671
Ann ICRP. 2002;32(3-4):5-265
14506981
Health Phys. 2005 Dec;89(6):645-59
16282797
Radiat Environ Biophys. 2001 Jun;40(2):153-62
11484787