Publications for TASLIMAGE and TASTRAK


Evaluation of risk of secondary cancer occurrence after proton radiotherapy of ocular tumours

Stolarczyk L, Cywicka-Jakiel T, Horwacik, T. et al. Dec. 2011
Radiation Measurements 46(12),DOI 10.1016/j.radmeas.2011.05.046
Reduction of undesired exposure to scattered neutron and gamma radiation associated with proton therapy should reduce the risk of occurrence of secondary cancers, especially in paediatric patients. By replacing the patient with a RANDO (R) antropomorphic phantom, we determined the undesired radiation doses during the entire course of treatment at the ocular proton radiotherapy facility at IFJ PAN in Krakow and estimated the associated risk of secondary cancers. The highest exposure from the scattered radiation, per therapeutic proton absorbed dose, was found in the brain close to the target volume. Using TASTRAK PADC track detectors we estimated the fast neutron dose equivalent in the brain at 15.2 mu Sv/Gy, a value consistent with 17.06 mu Sv/Gy obtained from MCNPX 2.5.0 Monte Carlo calculations. The ambient dose equivalent, H*(10), determined with WEND! II and FHT 192 detectors at the position of the patient (50 cm below the isocentre), was 2.41 mu Sv/Gy from neutrons and 0.43 mu Sv/Gy from gamma-rays, respectively. Based on estimated values of organ dose equivalents, we evaluate the whole-body risk of fatal secondary cancers per course of treatment at below 0.001%. (C) 2011 Elsevier Ltd. All rights reserved.

The response of CR-39 nuclear track detector to 1-9 MeV protons

Sinenian N, Rosenberg MJ, Manuel M, Petrasso RD, et al. Oct. 2011
The Review of scientific instruments 82(10):103303
The response of CR-39 nuclear track detector (TasTrak()) to protons in the energy range of 0.92-9.28 MeV has been studied. Previous studies of the CR-39 response to protons have been extended by examining the piece-to-piece variability in addition to the effects of etch time and etchant temperature; it is shown that the shape of the CR-39 response curve to protons can vary from piece-to-piece. Effects due to the age of CR-39 have also been studied using 5.5 MeV alpha particles over a 5-year period. Track diameters were found to degrade with the age of the CR-39 itself rather than the age of the tracks, consistent with previous studies utilizing different CR-39 over shorter time periods.

The response of CR-39 nuclear track detector to 1-9 MeV protons

Sinenian N, Rosenberg MJ, Manuel M, Petrasso RD, et al. Oct. 2011
Review of Scientific Instruments 82(10):103303, DOI: 10.1063/1.3653549
The response of CR-39 nuclear track detector (TasTrak (R)) to protons in the energy range of 0.92-9.28 MeV has been studied. Previous studies of the CR-39 response to protons have been extended by examining the piece-to-piece variability in addition to the effects of etch time and etchant temperature; it is shown that the shape of the CR-39 response curve to protons can vary from piece-to-piece. Effects due to the age of CR-39 have also been studied using 5.5 MeV alpha particles over a 5-year period. Track diameters were found to degrade with the age of the CR-39 itself rather than the age of the tracks, consistent with previous studies utilizing different CR-39 over shorter time periods. (C) 2011 American Institute of Physics. [doi:10.1063/1.3653549]

Spectrometry of linear energy transfer with track-etched detectors in carbon ion beams, MONO and SOBP

Pachnerova Brabcova K, Ambrozova I, Spurny F Feb. 2011
Radiation protection dosimetry 143(2-4):440, 4
Five various materials employed as track-etched detectors (TEDs) were exposed in beams of carbon ions with energy 290 MeV. u(-1) in the HIMAC-BIO facility in Japan. The exposures were performed behind various types of polymethyl methacrylate shielding. The beam had two possible set-ups--monoenergetic set-up and modulated spread-out Bragg peak set-up. All used TEDs are polyallyl diglycol carbonates (PADCs): Page from Mouldings (Pershore) Ltd, Tastrak from Track Analysis Systems Ltd, both from the UK; USF4 from American Technical Plastics from the USA and two products of Japan Fukuvi Chemical Industry Co., Ltd--TD1 and Baryotrak. Spectra of linear energy transfer and depth-dose distributions were obtained. Besides, differences among PADCs are discussed.

SPECTROMETRY OF LINEAR ENERGY TRANSFER WITH TRACK-ETCHED DETECTORS IN CARBON ION BEAMS, MONO AND SOBP

Brabcova K Pachnerova, Ambrozova I, Spurny F Feb. 2011
Radiation Protection Dosimetry 143 (2-4): 440, 444
Five various materials employed as track-etched detectors (TEDs) were exposed in beams of carbon ions with energy 290 MeV.u(-1) in the HIMAC-BIO facility in Japan. The exposures were performed behind various types of polymethyl methacrylate shielding. The beam had two possible set-ups-monoenergetic set-up and modulated spread-out Bragg peak set-up. All used TEDs are polyallyl diglycol carbonates (PADCs): Page from Mouldings (Pershore) Ltd, Tastrak from Track Analysis Systems Ltd, both from the UK; USF4 from American Technical Plastics from the USA and two products of Japan Fukuvi Chemical Industry Co., Ltd-TD1 and Baryotrak. Spectra of linear energy transfer and depth-dose distributions were obtained. Besides, differences among PADCs are discussed.
15th International Symposium on Microdosimetry, OCT 25-30, 2009, Verona, ITALY

Track etch based LET spectrometry in beams of neutrons with energies from 0.2 to 200 MeV

Brabcova K, Spurny F, Jadrnickova I, Nov. 2009
Radiation Measurements 44(9-10): 969-971, DOI 10.1016/j.radmeas.2009.10.089
There is still need to develop further methods able to characterize an external exposure to neutrons This. contribution presents results obtained with linear energy transfer spectrometer based on the chemically etched track detectors. There were employed two types of polyallyldiglycolcarbonates, Page and Tastrak, to obtain spectra of linear energy transfer. Detectors were exposed to monoenergetic neutron beams with energies of 0.2, 0.5,1, 3, 7,15, 20, 100 and 200 MeV. Calculated dose equivalents are compared with delivered reference values. (C) 2009 Elsevier Ltd. All rights reserved.
24th International Conference on Nuclear Tracks in Solids, SEP 01-05, 2008,Bologna, ITALY

Comparison among two fast neutron CR-39 (R) materials: preliminary experimental studies

Mariotti F, Falangi G, Fantuzzi E, Nov 2009
Radiation Measurements 44(9-10): 996-998, DOI 10.1016/j.radmeas.2009.10.003
The ENEA fast neutron dosemeter is based on a planar PADC (Poly Allyl Diglicol Carbonate) placed in a polyethylene holder. The present paper reports the results of a preliminary experimental comparison of a CR-39 (R) material with the addition of 0.1% of DOP (Dioctylphthalate), produced by the Italian company Intercast Europe S.p.A., and TASTRAK material produced by the British company TASL (UK). The etching procedure is for both materials: pre-etching with 40% KOH water solution 6.25 N and 60% ethyl alcohol at 70 degrees C followed by 12 h of etching in 6.25 N KOH water solution. Dosemeters have ((241)Am-Be) at the ENEA Calibration Service for Ionizing been irradiated with neutron sources Radiations. For each kind of set of detectors, 10 have been irradiated free-in-air at 1 mSv of H*(10) with an (241)Am-Be source at ENEA Calibration Service for Ionizing Radiations, whilst the other 40 detectors have been used as background samples. The dosimetric performance of the material for fast neutrons is expressed in terms of sensitivity, background value and lowest detectable dose. For each batch the value of the average background signal, the average neutron sensitivity and minimum detectable dose equivalent have been determined. Two identical tests have been completed and separated with a time of 6 months in order to evaluate the aging effect on the material stored in the same conditions. The results are compared with our acceptance test. A comparison of criteria the performance of the two CR-39 (R) materials is reported. (C) 2009 Elsevier Ltd. All rights reserved.
24th International Conference on Nuclear Tracks in Solids, SEP 01-05, 2008, Bologna, ITALY

Effect of thermal annealing on optical properties of CR-39 polymeric track detector

Nidhi, Gupta Renu, Sharma Tanu, Aggarwal Sanjeev, Kumar S, Jul. 2009
INDIAN JOURNAL OF PHYSICS AND PROCEEDINGS OF THE INDIAN ASSOCIATION FOR THE CULTIVATION OF SCIENCE 83(7): 921-926, DOI 10.1007/s12648-009-0049-4
The samples of CR-39 polymer (TASTRAK, Bristol, England) were annealled thermally at various temperatures ranging from 100 degrees C to 180 degrees C for 1 hour, in air. FTIR spectroscopy reveals the structural degradation of CR-39 polymer due to thermal annealing above its glass transition temperature. Optical band gap of pristine and thermally annealed samples has been determined using UV-Visible absorption spectra. It has been observed that the optical band gap decreases continuously as a result of annealing.
15th National Symposium on Solid State Nuclear Track Detectors and their Applications