0 20 40 60 80 1
RESULTS AND DISCUSSION
Figure 4. Diffuse-reflectance and fluorescence spectra of nano-FAP powder
All diffraction peaks can be assigned to synthetic
fluoroapatite [JCPDS 83-0557], indicating that
obtained phase of FAP is pure with high
The FTIR spectrum contain characteristic
phosphate bands at 572 and 602 cm-1 (ν4), and at
1037.2 and 1095 cm-1 (ν3). Small band at 750.5
cm-1 arise from presence of fluor.
Particles of FAP have nano size at about 100 nm,
and easily form agglomerates of 1 and 2 μm.
1University of Belgrade, Vinča Institute of Nuclear Science, P. O. Box 522
11001 Belgrade, Serbia (firstname.lastname@example.org)
2 University of Novi Sad, Faculty of Technology, Bul. Cara Lazara 1, 21000 Novi S
3University of Belgrade, Faculty of Chemistry, P. O. Box 51, 11158 Belgrade, S
4University of Belgrade, ICTM, Njegoševa 12, 11000 Belgrade, Serbia
Figure 3. Micrographs of the nano-FAP powder
Synthesis and characterization of luminescent fluorapatite
nanomaterial as potential dosimeter for food irradiation
Ab initio calculations of fluorescence spectra were done on three geometries with metal ion
in positions I and II, while the third model system contains three metal cations, three PO 3−
anions and F− ion in the center (luminescence center). The third model system showed the
best agreement with the experimental data .
Figure 5. Model systems for fluorescence of FAP .
Food irradiation, a technology of processing of food by ionizing
radiation, can serve many purposes such as preservation, delay of
sprouting and ripening, control of insects and pests, prevention of
foodborne illness, and especially sterilization of food for illness patients
and astronauts [1, 2]. It is of great importance for food irradiation to use
a dosimetry and to develop new and better suited dose meter materials,
which will cover the full range of food irradiation from 10 Gy to 10 kGy
. In recent years, synthesis, characterization and applicability of
apatite based materials, such as fluorapatite and hydroxyapatite, as
potential dosimeter materials in food irradiation, environmental
protection and medicine, can be noticed [4, 5]. In this paper,
luminescent fluorapatite material, as potential dosimeter in many fields,
was synthesized and characterized.
Fluorapatite precipitate was prepared at room temperature by using
3 2 2 4 2 4 4
Ca(NO ) ∙4H O, (NH ) HPO and (NH )F of p.a. grade of purity. The
obtained precipitate was dried at 110 oC for 12 h. The resulting material
is calcinated at fixed 1000 oC for 1 h. Characterization was done by XRD,
FTIR, SEM, UV-VIS and PL.
This work was supported by the Ministry for Science and Technological Development of the Republic of Serbia (Project No.III 43009). DVM thanks his parents who funded his volunteer work on this research.
Figure 1. XRD difractogram of the nano-FAP powder Figure 2. FTIR spectrum of the nano-FAP powder
 Radiation processing dosimetry-past, present and future, Techniques for high
dose dosimetry in industry, agriculture and medicine, IAEA,Vienna, 1999, 3-10
 Dosimetry for food irradiation, Technical reports series No. 409,
IAEA, Vienna, 2002, 9-31
 D. A. E. Ehlermann, The Suitability of intrinsic and added materials as dose meters for
radiation processing of particulate foods, Radiat. Phys. Chem.,1990, 36(5), 609-612
 M. Shafaei, F. Ziaie, D. Sardari, M. M. Larijani, Thermoluminescence properties of
gamma irradiated nano-structure hydroxyapatite, Luminescence, 2016, 31, 223–228
 D. Lapraz, A.Baumer, Thermoluminescent properties of synthetic and natural
fluorapatite, Ca5(PO4)3F, physica status solidi,1983, 80, 353–366
 G. Janjić, D. Milojkov, V. Stanić, Model systems for fluorescence of fluorapatite based
on crystallographic and quantum-chemical data, Abstracts, 23rd Conference of the
In diffuse-reflectance spectrum, the
maximum of reflectance of 90% is
noticed around 310 nm.
In fluorescence spectrum, peak is
located in violet region of visible
part of spectrum.
Luminescent nanostructured particles of FAP were synthesized
by precipitation at low temperature condition.
Obtained monophase nanomaterial is of high crystallinity, with
fluorescence in violet region.