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Coherent and incoherent scatterings for measurement of mandibular bone density and stable iodine content of tissue.

Sharma A, Singh M, Singh B, Sandhu BS - J Med Phys (2009)

Bottom Line: A high-purity germanium detector is placed at various angular positions to record the scattered spectra originating from interactions of incident gamma rays with the phantom.The measured intensity ratio of coherent to incoherent scattered gamma rays, corrected for photo-peak efficiency of HPGe detector, absorption of gamma rays in air column present between phantom and detector, and self-absorption in the phantom, is found to be increasing linearly with increase in concentration of K(2)HPO(4) and KI in distilled water within experimental estimated error of <6%.The present non-destructive technique has the potential for a measure of mandibular bone density and stable iodine contents of thyroid.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Punjabi University, Patiala-147002, India.

ABSTRACT
The aim of present study is to investigate the feasibility of gamma ray scattering for measurements of mandibular bone density and stable iodine content of tissue. Scattered spectra from solutions of K(2)HPO(4) in distilled water (a phantom simulating the mandibular bone) and KI in distilled water filled in a thin plastic vial (a phantom simulating the kinetics of thyroid iodine) are recorded for 59.54 and 145 keV incident gamma rays, respectively. A high-purity germanium detector is placed at various angular positions to record the scattered spectra originating from interactions of incident gamma rays with the phantom. The measured intensity ratio of coherent to incoherent scattered gamma rays, corrected for photo-peak efficiency of HPGe detector, absorption of gamma rays in air column present between phantom and detector, and self-absorption in the phantom, is found to be increasing linearly with increase in concentration of K(2)HPO(4) and KI in distilled water within experimental estimated error of <6%. The regression lines, obtained from experimental data for intensity ratio, provide the bone density and stable iodine contents of thyroid. The present non-destructive technique has the potential for a measure of mandibular bone density and stable iodine contents of thyroid.

No MeSH data available.


Related in: MedlinePlus

Experimental variation of coherent to incoherent scattered intensity as function of concentration of K2HPO4 solution (a) simulating mandibular bone and KI solution (b) simulating stable iodine content of thyroid. The measured statistical uncertainties lie within the size of experimental observed points represented by filled circles
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Figure 0003: Experimental variation of coherent to incoherent scattered intensity as function of concentration of K2HPO4 solution (a) simulating mandibular bone and KI solution (b) simulating stable iodine content of thyroid. The measured statistical uncertainties lie within the size of experimental observed points represented by filled circles

Mentions: The actual values of intensity ratio of Rayleigh to Compton scattering, corrected for various effect discussed above, for different concentration of K2HPO4 and KI solutions at various selected scattering angles, are given in columns (after column 1) of [Tables Table 1 and Table 2], respectively. The errors quoted in measured intensity ratio indicate percentage error due to statistical uncertainties only. The measured values of Rayleigh to Compton intensity ratio, for various scattering angles, are also plotted as function of concentration of K2HPO4 (curves of [Figure 3a]) and KI (curves of [Figure 3b]) solution. The solid lines represent the best-fit lines through the experimental data points corresponding to the measured intensity ratios. The equations for the best-fitted regression lines are linear one. The slope of linear curves also increases with scattering angle. This is because an increase in scattering angle results in decrease in the probability for scattering process to occur, and this decrease is more pronounced for Rayleigh scattering in comparison to Compton scattering. The measured values of slope and intercept for the regression lines of phantom simulating thyroid are 0.00217, 0.00323, 0.00178 g-1 and 0.00723, 0.0037, and 0.00204 for scattering angles of 50°, 70°, and 90°, respectively.


Coherent and incoherent scatterings for measurement of mandibular bone density and stable iodine content of tissue.

Sharma A, Singh M, Singh B, Sandhu BS - J Med Phys (2009)

Experimental variation of coherent to incoherent scattered intensity as function of concentration of K2HPO4 solution (a) simulating mandibular bone and KI solution (b) simulating stable iodine content of thyroid. The measured statistical uncertainties lie within the size of experimental observed points represented by filled circles
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2807686&req=5

Figure 0003: Experimental variation of coherent to incoherent scattered intensity as function of concentration of K2HPO4 solution (a) simulating mandibular bone and KI solution (b) simulating stable iodine content of thyroid. The measured statistical uncertainties lie within the size of experimental observed points represented by filled circles
Mentions: The actual values of intensity ratio of Rayleigh to Compton scattering, corrected for various effect discussed above, for different concentration of K2HPO4 and KI solutions at various selected scattering angles, are given in columns (after column 1) of [Tables Table 1 and Table 2], respectively. The errors quoted in measured intensity ratio indicate percentage error due to statistical uncertainties only. The measured values of Rayleigh to Compton intensity ratio, for various scattering angles, are also plotted as function of concentration of K2HPO4 (curves of [Figure 3a]) and KI (curves of [Figure 3b]) solution. The solid lines represent the best-fit lines through the experimental data points corresponding to the measured intensity ratios. The equations for the best-fitted regression lines are linear one. The slope of linear curves also increases with scattering angle. This is because an increase in scattering angle results in decrease in the probability for scattering process to occur, and this decrease is more pronounced for Rayleigh scattering in comparison to Compton scattering. The measured values of slope and intercept for the regression lines of phantom simulating thyroid are 0.00217, 0.00323, 0.00178 g-1 and 0.00723, 0.0037, and 0.00204 for scattering angles of 50°, 70°, and 90°, respectively.

Bottom Line: A high-purity germanium detector is placed at various angular positions to record the scattered spectra originating from interactions of incident gamma rays with the phantom.The measured intensity ratio of coherent to incoherent scattered gamma rays, corrected for photo-peak efficiency of HPGe detector, absorption of gamma rays in air column present between phantom and detector, and self-absorption in the phantom, is found to be increasing linearly with increase in concentration of K(2)HPO(4) and KI in distilled water within experimental estimated error of <6%.The present non-destructive technique has the potential for a measure of mandibular bone density and stable iodine contents of thyroid.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Punjabi University, Patiala-147002, India.

ABSTRACT
The aim of present study is to investigate the feasibility of gamma ray scattering for measurements of mandibular bone density and stable iodine content of tissue. Scattered spectra from solutions of K(2)HPO(4) in distilled water (a phantom simulating the mandibular bone) and KI in distilled water filled in a thin plastic vial (a phantom simulating the kinetics of thyroid iodine) are recorded for 59.54 and 145 keV incident gamma rays, respectively. A high-purity germanium detector is placed at various angular positions to record the scattered spectra originating from interactions of incident gamma rays with the phantom. The measured intensity ratio of coherent to incoherent scattered gamma rays, corrected for photo-peak efficiency of HPGe detector, absorption of gamma rays in air column present between phantom and detector, and self-absorption in the phantom, is found to be increasing linearly with increase in concentration of K(2)HPO(4) and KI in distilled water within experimental estimated error of <6%. The regression lines, obtained from experimental data for intensity ratio, provide the bone density and stable iodine contents of thyroid. The present non-destructive technique has the potential for a measure of mandibular bone density and stable iodine contents of thyroid.

No MeSH data available.


Related in: MedlinePlus