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Petelenz B. Maria Skłodowska-Curie—Heritage of the 19th and legacy to the 21st century. Catal Today 2012. [DOI: 10.1016/j.cattod.2011.12.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Stoch G, Ylinen EE, Punkkinen M, Petelenz B, Birczyński A. Deuteron NMR spectra and relaxation in fully and partly deuterated (NH4)2ZnCl4. Solid State Nucl Magn Reson 2009; 35:180-186. [PMID: 19272759 DOI: 10.1016/j.ssnmr.2008.12.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2008] [Revised: 10/31/2008] [Accepted: 12/05/2008] [Indexed: 05/27/2023]
Abstract
Deuteron NMR spectra and relaxation were studied at the resonance frequency of 46MHz in polycrystalline fully and partly deuterated (NH(4))(2)ZnCl(4) between 300 and 5K. Spectral components confirm existence of ammonium positions with different potential symmetry, resulting in two- and threefold reorientation of ammonium ions. The temperature dependence of the spin-lattice relaxation rate discloses two time constants in the whole range. The fitting procedure allows the separation into contributions from subsystems of ions in respective potentials. Two relaxation rate maxima are attributed to ions performing threefold uniaxial reorientation at low temperatures. The lower-temperature maximum is observed at T36K. With increasing temperature reorientations about remaining axes start to contribute leading to the other maximum near 100K. The other category of ammonium ions gives rise to the maximum at about 50K. Below this temperature the dominant motion seems to be 180( composite function) reorientations about one twofold axis according to observed spectra. Consistent picture of ion mobility is accomplished for 5%, 30%, 70% and 100% deuterated compounds.
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Affiliation(s)
- G Stoch
- H Niewodniczański Institute of Nuclear Physics of PAS, Kraków, Poland
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Wilczek K, Petelenz B, Strzała A, Marczewska B, Traczyk M, Poloński L. Dose perturbation caused by stents: experiments with a model 90Sr/90Y source. Cardiovasc Intervent Radiol 2007; 30:981-91. [PMID: 17710473 DOI: 10.1007/s00270-007-9148-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2006] [Revised: 06/12/2007] [Accepted: 06/21/2007] [Indexed: 10/22/2022]
Abstract
PURPOSE Biological effects of intravascular brachytherapy are very sensitive to discrepancies between the prescription and the applied dose. If brachytherapy is aimed at in-stent restenosis, shielding and shadowing effects of metallic stents may change the dose distribution relative to that produced by the bare source. The development of new generations of stents inspired us to a new experimental study in this field. The effect was studied for 14 stents which we have recently encountered in clinical practice. METHODS The model source was a continuous 20-mm column of (90)Sr/(90)Y solution sealed in a 1-mm-I.D. Plexiglas capillary. The dose distribution in the Plexiglas phantom was mapped using GafChromic MD-55-2 film. The stent masses varied from 2.5 to 25 mg; the strut thicknesses, from 0.075 to 0.15 mm; and the atomic numbers of stent materials, from 24 (Cr) to 79 (Au). RESULTS Dose perturbations depend on a variety of stent features. Local reduction of the mean dose rates near the reference distance (r(0) = 2 mm) varied from 11% to 47%. No simple correlation was found between these data and stent characteristics, but it seems that the atomic number of the stent material is less important than the strut thickness and mesh density. CONCLUSION The results provide a warning that clinical indications for in-stent radiation therapy must always be confronted with another aspect of the patient's history: the kind of implanted stent. Intravascular brachytherapy using pure beta sources may be recommended only for patients "wearing" light, thin-strut stents. The presence of thick-strut stents is a contraindication for this modality, due to excessive dose perturbation.
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Affiliation(s)
- Krzysztof Wilczek
- The Silesian Center for Heart Diseases, 3rd Chair and Clinical Hospital for Heart Diseases, Medical University of Silesia, 41-800 Zabrze, Szpitalna 2, Poland
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Birczyński A, Lalowicz ZT, Olejniczak Z, Stoch G, Petelenz B. Deuteron NMR spectra of ammonium ion isotopomers at low temperatures. Solid State Nucl Magn Reson 2005; 28:142-59. [PMID: 16081254 DOI: 10.1016/j.ssnmr.2005.07.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2005] [Revised: 07/06/2005] [Accepted: 07/08/2005] [Indexed: 05/03/2023]
Abstract
Partially deuterated ammonium compounds contain ammonium ion isotopomers with relative abundances given by the binomial distribution of protons and deuterons. All isotopomers with deuterons contribute characteristic deuteron NMR spectra at 5K. Experimental NMR spectra were separated and respective contributions of isotopomers were determined. The derived contributions agree with expected values for a given deuteration in the case of ammonium hexafluorophosphate. In ammonium hexachlorotellurate both NH2D2+ and about 50% of NH3D+ ions are rigid, while the remaining NH3D+ perform limited jumps. NHD3+ and ND4+ ions undergo tunnelling rotation, NH3D+ ions perform either jumps about C2 axis or limited jumps, but some stay rigid in ammonium hexachlorostannate. NH2D2+, NHD 3+ and ND4+ undergo rotational tunnelling. In the case of ammonium perchlorate, the NH3D+ ions perform either jumps about C3 axis or limited jumps whilst some remain rigid. Very low values of activation energies were derived for all spectral components from the temperature dependence of their spectra, up to about 20K, which indicates an incoherent tunnelling nature of the observed dynamic processes. The diverse mobility of NH3D+ ions appears to be the most interesting and new feature.
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Affiliation(s)
- A Birczyński
- H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Kraków, Poland
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Zalutsky MR, Petelenz B. Targeted Radiotherapy with Alpha-Particle Emitting Radionuclides Seminar, November 18, 2004, Cracow, Poland. Nucl Med Rev Cent East Eur 2004; 7:195. [PMID: 15968616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023] Open
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Walichiewicz P, Wilczek K, Petelenz B, Jacheć W, Jochem J, Tomasik A, Bilski P, Gaca P, Banaszczuk J, Ihnatowicz J, Wodniecki J. Post-Dilatation Intravascular Brachytherapy Trials on Hypercholesterolemic Rabbits Using 32P-Phosphate Solutions in Angioplasty Balloons. Cardiovasc Intervent Radiol 2003; 27:42-50. [PMID: 15109228 DOI: 10.1007/s00270-003-2700-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
PURPOSE Response of peripheral arteries to post-dilatation intravascular brachytherapy (IVBT) using 32P liquid sources was studied in a rabbit model. METHODS The applied sources were angioplasty balloons filled with aqueous solutions of Na2H32PO4, NaCl and iodinated contrast. Dose distribution was calibrated by thermoluminescence dosimetry. The uncertainty of in vitro determinations of the activity-dose dependence was +/- 15-30%. The animal experiments were performed on rabbits with induced hypercholesterolemia. The 32P sources were introduced into a randomly chosen (left or right) iliac artery, immediately after balloon injury. Due to the low specific activity of the applied sources, the estimated 7-49 Gy doses on the internal artery surface required 30-100 min irradiations. A symmetric, balloon-occluded but non-irradiated artery of the same animal served as control. Radiation effects were evaluated by comparing the thicknesses of various components of irradiated versus untreated artery walls of each animal. RESULTS The treatment was well tolerated by the animals. The effects of various dose ranges could be distinguished although differences in individual biological reactions were large. Only the 49 Gy dose at "zero" distance (16 Gy at 1.0 mm from the balloon surface) reduced hypertrophy in every active layer of the artery wall. The cross-sectional intimal thicknesses after 7, 12, 38 and 49 Gy doses were 0.277, 0.219, 0.357 and 0.196 mm2 respectively, versus 0.114, 0.155, 0.421 and 0.256 mm2 in controls (p < 0.05). The lowest radiation dose on the intima induced the opposite effect. Edge intimal hyperplasia was not avoided, which agrees with other reports. The edge restenosis and the variability of individual response to identical treatment conditions must be considered as limitations of the post-dilatation IVBT method. CONCLUSION Only application of highest irradiation doses was effective. The irradiation dose should be planned and calculated for adventitia.
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Affiliation(s)
- Piotr Walichiewicz
- Brachytherapy Unit, Institute of Oncology-Gliwice Division, 44-101 Gliwice, Poland.
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Walichiewicz P, Petelenz B, Wilczek K, Jacheć W, Jochem J, Tomasik A, Lange D, Wodniecki J. 32P liquid sources—comparison of the effectiveness of postangioplasty versus poststenting intravascular brachytherapy in hypercholesterolemic rabbits. Cardiovascular Radiation Medicine 2003; 4:64-8. [PMID: 14581085 DOI: 10.1016/s1522-1865(03)00145-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE Endovascular application of ionizing radiation is a promising but still not sufficiently studied means of restenosis prevention. To test the effects of radiation on restenosis, and especially their dependence on whether the angioplasty was followed by stent implantation or not, we performed an in-stent versus no-stent intravascular brachytherapy study in an animal model. Balloon-based, continuous and self-centering, liquid 32P sources seemed the most convenient for the purpose. METHOD The radial dose distribution around angioplasty balloons filled with solutions of Na(2)H32PO(4) was calibrated by thermoluminescence dosimetry, both in the absence and presence of stents. The animal experiments were performed on rabbits with induced hypercholesterolemia. The balloons containing 32P were introduced into iliac artery immediately after stent implantation or after angioplasty alone. Radiation effects were evaluated postmortem by comparing thickness of various components of the artery wall. RESULTS In the presence of titanium stents (TTS), irradiation with 16 Gy dose at 1.0 mm from the balloon surface was no less effective in reducing hypertrophy in every active layer of the artery wall than without a stent. CONCLUSION In the animal model, IVBT basing on P(32) liquid sources was no less effective in the stented arteries than in the nonstented ones.
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Affiliation(s)
- Piotr Walichiewicz
- Institute of Oncology, 15 Wybrzeze Armii Krajowej Str., 44-100, Gliwice, Poland.
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Petelenz B, Rajchel B, Bilski P, Misiak R, Bartyzel M, Wilczek K, Alber D. Physical and chemical limitations to preparation of beta radioactive stents by direct neutron activation. Biomaterials 2003; 24:427-33. [PMID: 12423597 DOI: 10.1016/s0142-9612(02)00355-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Pure beta emitters are the sources of choice for intracoronary irradiations in restenosis prevention. In this work we reconsidered preparation of low activity 32P sources by ion-implantation of stable 31P into highly biocompatible pure titanium stents, followed by neutron activation. Gamma-spectrometrical analysis has shown that during activations with high thermal neutrons flux production of gamma-active long-lived contaminants is much beyond the dosimetrically acceptable limit, mainly due to the competing (n,p) reactions induced by the fast neutrons on isotopes of the bulk stent material, and to a lesser extent due to (n,gamma) reactions on chemical impurities. A potential applicability of this method for obtaining alternative beta radioactive stents is discussed.
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Affiliation(s)
- Barbara Petelenz
- The Henryk Niewodniczański Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Kraków, Poland.
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Wilczek K, Walichiewicz P, Petelenz B, Jache W, Jochem J, Tomasik A, Bilski P, Snietura M, Wodniecki J. Post-stenting intravascular brachytherapy trials on hypercholesterolemic rabbits using 32P liquid sources: implications for prevention of in-stent restenosis. Cardiovasc Intervent Radiol 2002; 25:307-13. [PMID: 12042990 DOI: 10.1007/s00270-002-1879-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
PURPOSE Liquid sources of radiation delivered in angioplasty balloons may be a convenient self-centering device used for prevention of in-stent restenosis. To test the effectiveness of this method an intravascular brachytherapy study was performed using 32P liquid sources in an animal model. METHODS The radial dose distribution around angioplasty balloons filled with solutions of Na 2H 32PO 4 was calibrated by thermoluminescence dosimetry. The animal experiments were performed in rabbits with induced hypercholesterolemia. The balloons containing 32P were introduced into iliac arteries immediately after stent implantation. Estimated 7-49 Gy doses required 30-100 min irradiations. Radiation effects were evaluated by comparing the thickness of various components of the artery wall. RESULTS Doses of 7, 12, 16 or 49 Gy on the internal artery surface required 30-100 min of irradiation. The dose of 49 Gy at "zero" distance corresponding to 16 Gy at 1.0 mm from the balloon surface reduced hypertrophy in every layer of the arterial wall: in the intima the cross-sectional areas were 0.13 versus 0.91 mm 2, in the media were 0.5 versus 0.46 mm 2 and in the adventitia were 0.04 versus 0.3 mm 2 (p <0.05). A dose of 7 Gy at the balloon surface produced adverse irradiation effects: the intimal area of the artery was 2.087 versus 0.857 mm 2, the medial area was 0.59 versus 0.282 mm 2 and the adventitial area was 0.033 versus 0.209 mm 2 in treated and control arteries, respectively. CONCLUSION Application of a 49 Gy irradiation dose to the internal arterial surface effectively prevented in-stent restenosis.
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Affiliation(s)
- Krzysztof Wilczek
- III rd Department of Cardiology, Silesian School of Medicine, 2 Szpitalna str., 41-800 Zabrze, Poland.
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Petelenz B, Bilski P, Walichiewicz P, Gaca P, Wilczek K. Thermoluminescence dosimetry of liquid sources of variable size and composition. RADIAT MEAS 2002. [DOI: 10.1016/s1350-4487(02)00040-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bilski P, Ochab E, Petelenz B, Walichiewicz P, Wodniecki J. Thermoluminescence dosimetry in evaluation of liquid 32P sources for intravascular brachytherapy. RADIAT MEAS 2000. [DOI: 10.1016/s1350-4487(99)00269-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Zagrodzki P, Mietelski JW, Krośniak M, Petelenz B. Accumulation of cesium and radiocesium in forest litter in selected regions of Poland and its influence on litter-to-mushroom transfer factor. Biol Trace Elem Res 1994; 43-45:273-7. [PMID: 7710837 DOI: 10.1007/bf02917325] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The aim of this work was to check whether the stable cesium content in forest litter affects the value of radiocesium from litter-to-mushroom transfer factor Tf or not. Total cesium in litter, measured by AAS, varied from 0.1-2.7 micrograms/g. These data, combined with earlier results for mushrooms, showed no simple correlation for Tf. More complex relationships provided very high correlation coefficients, but their validity needs further investigation.
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Affiliation(s)
- P Zagrodzki
- Henryk Niewodniczański Institute of Nuclear Physics, Radzikowskiego, Poland
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Kalinowski J, Stampor W, Petelenz B, Petelenz P. Electro-absorption spectrum of tetracene. High field measurements on polycrystalline samples. Chem Phys 1992. [DOI: 10.1016/0301-0104(92)80033-r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ng JB, Petelenz B, Shurvell HF. The complementary use of factor analysis and spectral deconvolution in a study of the CD3COOD–D2O system. CAN J CHEM 1988. [DOI: 10.1139/v88-308] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The carbonyl stretching region of fully deuterated acetic acid CD3COOD in D2O has been studied by means of Raman spectroscopy. The number of linearly independent spectral components was determined to be four by factor analysis. Fourier self-deconvolution of the spectra revealed another major component band which was assigned to an overtone and/or combination vibration of the acid monomer. The overall band envelope was fitted with five Gauss–Lorentz functions using a non-linear least squares procedure. The abnormally high intensity of the band assigned to the overtone/combination is discussed in terms of Fermi resonance.
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Chałasiński G, Kołos W, Petelenz B, Piela L. Gaussian orbitals in calculations of the second-order corrections to the interaction energy of two hydrogen atoms. Chem Phys Lett 1971. [DOI: 10.1016/0009-2614(71)85053-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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