Track-etched detectors are commonly used also for radiation monitoring onboard International Space Station. To be registered in track-etched detectors, the particle needs to meet several criteria-it must have linear energy transfer above the detection threshold and strike the detector's surface under an angle higher than the so-called critical angle. Linear energy transfer is then estimated from calibration curve from the etch rate ratio V that is calculated from parameters of individual tracks appearing on the detector's surface after chemical etching. It has been observed that V can depend on the incident angle and this dependence can vary for different detector materials, etching and evaluating conditions. To investigate angular dependence, detectors (Harzlas TD-1) were irradiated at HIMAC by several ions under angles from 0° to 90°. The correction accounting not only for critical angle but also for dependence of V on the incident angle is introduced and applied to spectra measured onboard International Space Station.

• MeSH
• dávka záření MeSH
• ionty MeSH
• kalibrace MeSH
• kosmická loď * MeSH
• kosmické záření MeSH
• kosmický let přístrojové vybavení   MeSH
• lineární přenos energie MeSH
• monitorování radiace přístrojové vybavení   metody   MeSH
• termoluminiscenční dozimetrie přístrojové vybavení   metody   MeSH
• těžké ionty * MeSH
• Publikační typ
• časopisecké články MeSH

• MeSH
• dospělí MeSH
• klinická studie jako téma MeSH
• koronární angiografie * metody   MeSH
• lidé středního věku MeSH
• lidé MeSH
• počítačová rentgenová tomografie * metody   MeSH
• radiační expozice analýza   MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• termoluminiscenční dozimetrie * metody   MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• ženské pohlaví MeSH

As workers in interventional radiology belong to one of the most occupationally exposed groups, methods for sufficiently accurate quantification of their external exposure are sought. The objective of the authors' experiment was to investigate the relations between eye lens dose and Hp(10), Hp(3) or Hp(0.07) values measured with a conventional whole-body personal thermoluminescence dosemeter (TLD). Conditions of occupational exposure during common interventional procedures were simulated in laboratory. An anthropomorphic phantom represented a physician. The TLDs were fixed to the phantom in different locations that are common for purposes of personal dosimetry. In order to monitor the dose at the eye lens level during the exposures, a special thermoluminescence eye dosemeter was fixed to the phantom's temple. Correlations between doses measured with the whole-body and the eye dosemeters were found. There are indications that personnel in interventional radiology do not need to be unconditionally equipped with additional eye dosemeters, especially if an appropriate whole-body dosimetry system has been already put into practice.

• MeSH
• celotělové počítání MeSH
• dávka záření * MeSH
• fantomy radiodiagnostické MeSH
• intervenční radiologie metody   MeSH
• kalibrace MeSH
• lidé MeSH
• monitorování radiace metody   MeSH
• ochranné prostředky očí MeSH
• oční čočka účinky záření   MeSH
• operační sály MeSH
• počítačová simulace MeSH
• pracovní expozice analýza   prevence a kontrola   MeSH
• radiační ochrana metody   MeSH
• termoluminiscenční dozimetrie přístrojové vybavení   metody   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

UNLABELLED: The International Atomic Energy Agency (IAEA) has a long tradition of supporting development of methodologies for national networks providing quality audits in radiotherapy. A series of co-ordinated research projects (CRPs) has been conducted by the IAEA since 1995 assisting national external audit groups developing national audit programs. The CRP 'Development of Quality Audits for Radiotherapy Dosimetry for Complex Treatment Techniques' was conducted in 2009-2012 as an extension of previously developed audit programs. MATERIAL AND METHODS: The CRP work described in this paper focused on developing and testing two steps of dosimetry audit: verification of heterogeneity corrections, and treatment planning system (TPS) modeling of small MLC fields, which are important for the initial stages of complex radiation treatments, such as IMRT. The project involved development of a new solid slab phantom with heterogeneities containing special measurement inserts for thermoluminescent dosimeters (TLD) and radiochromic films. The phantom and the audit methodology has been developed at the IAEA and tested in multi-center studies involving the CRP participants. RESULTS: The results of multi-center testing of methodology for two steps of dosimetry audit show that the design of audit procedures is adequate and the methodology is feasible for meeting the audit objectives. A total of 97% TLD results in heterogeneity situations obtained in the study were within 3% and all results within 5% agreement with the TPS predicted doses. In contrast, only 64% small beam profiles were within 3 mm agreement between the TPS calculated and film measured doses. Film dosimetry results have highlighted some limitations in TPS modeling of small beam profiles in the direction of MLC leave movements. DISCUSSION: Through multi-center testing, any challenges or difficulties in the proposed audit methodology were identified, and the methodology improved. Using the experience of these studies, the participants could incorporate the auditing procedures in their national programs.

• MeSH
• dozimetry MeSH
• fantomy radiodiagnostické MeSH
• lidé MeSH
• mezinárodní agentury MeSH
• plánování radioterapie pomocí počítače metody   normy   MeSH
• radiometrie přístrojové vybavení   metody   normy   MeSH
• řízení kvality MeSH
• termoluminiscenční dozimetrie přístrojové vybavení   metody   normy   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• multicentrická studie MeSH

Progress in the development of high-performance semiconductor radiation imaging pixel detectors based on technologies developed for use in high-energy physics applications has enabled the development of a completely new generation of compact low-power active dosimeters and area monitors for use in space radiation environments. Such detectors can provide real-time information concerning radiation exposure, along with detailed analysis of the individual particles incident on the active medium. Recent results from the deployment of detectors based on the Timepix from the CERN-based Medipix2 Collaboration on the International Space Station (ISS) are reviewed, along with a glimpse of developments to come. Preliminary results from Orion MPCV Exploration Flight Test 1 are also presented.

• MeSH
• dávka záření MeSH
• design vybavení MeSH
• kosmická loď MeSH
• kosmické záření * MeSH
• kosmický let MeSH
• monitorování radiace přístrojové vybavení   metody   MeSH
• radiometrie metody   MeSH
• termoluminiscenční dozimetrie metody   MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Research Support, U.S. Gov't, Non-P.H.S. MeSH

Dose delivered outside the proton field during radiotherapy can potentially lead to secondary cancer development. Measurements with a 170-MeV proton beam were performed with passive detectors (track etched detectors and thermoluminescence dosemeters) in three different depths along the Bragg curve. The measurement showed an uneven decrease of the dose outside of the beam field with local enhancements. The major contribution to the delivered dose is due to high-energy protons with linear energy transfer (LET) up to 10 keV µm(-1). However, both measurement and preliminary Monte Carlo calculation also confirmed the presence of particles with higher LET.

• MeSH
• celková dávka radioterapie * MeSH
• design vybavení MeSH
• fantomy radiodiagnostické MeSH
• lidé MeSH
• lineární přenos energie MeSH
• metoda Monte Carlo MeSH
• neutrony MeSH
• plánování radioterapie pomocí počítače MeSH
• polymethylmethakrylát chemie   MeSH
• protonová terapie škodlivé účinky   MeSH
• protony * MeSH
• radiometrie přístrojové vybavení   metody   MeSH
• radioterapie škodlivé účinky   MeSH
• reprodukovatelnost výsledků MeSH
• termoluminiscenční dozimetrie přístrojové vybavení   metody   MeSH
• vysokoenergetická radioterapie MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Geografické názvy
• Rusko MeSH

State-of-the-art laser systems are able to generate ionising radiation of significantly high energies by focusing ultra-short and intense pulses onto targets. Thus, measures ensuring the radiation protection of both working personnel and the general public are required. However, commercially available dosemeters are primarily designed for measurement in continuous fields. Therefore, it is important to explore their response to very short pulses. In this study, the responses of dosemeters in a radiation field generated by iodine high-power and Ti:Sapphire laser systems are examined in proton and electron acceleration experiments. Within these experiments, electron bunches of femtosecond pulse duration and 100-MeV energy and proton bunches with sub-nanosecond pulse duration and energy of several megaelectronvolts were generated in single-shot regimes. Responses of typical detectors (TLD, films and electronic personal dosemeter) were analysed and compared. Further, a first attempt was carried out to characterise the radiation field generated by TW-class laser systems.

• MeSH
• anizotropie MeSH
• dávka záření MeSH
• design vybavení MeSH
• elektronika MeSH
• elektrony MeSH
• ionizující záření MeSH
• jod MeSH
• křemík MeSH
• lasery * MeSH
• lidé MeSH
• oxid hlinitý chemie   MeSH
• pracovní expozice analýza   prevence a kontrola   MeSH
• protony MeSH
• radiační ochrana přístrojové vybavení   MeSH
• radiometrie přístrojové vybavení   metody   MeSH
• termoluminiscenční dozimetrie přístrojové vybavení   metody   MeSH
• titan chemie   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

Gamma dose and thermal neutron fluence in a phantom exposed to an epithermal neutron beam for boron neutron capture therapy (BNCT) can be measured by means of a single thermoluminescence dosemeter (TLD-700). The method exploits the shape of the glow curve (GC) and requires the gamma-calibration GC (to obtain gamma dose) and the thermal-neutron-calibration GC (to obtain neutron fluence). The method is applicable for BNCT dosimetry in case of epithermal neutron beams from a reactor because, in most irradiation configurations, thermal neutrons give a not negligible contribution to the TLD-700 GC. The thermal neutron calibration is not simple, because of the impossibility of having thermal neutron fields without gamma contamination, but a calibration method is here proposed, strictly bound to the method itself of dose separation.

• MeSH
• celková dávka radioterapie MeSH
• fantomy radiodiagnostické MeSH
• fluoridy MeSH
• fotony MeSH
• kalibrace MeSH
• lidé MeSH
• nádory radioterapie   MeSH
• neutrony MeSH
• plánování radioterapie pomocí počítače MeSH
• reprodukovatelnost výsledků MeSH
• sloučeniny lithia MeSH
• terapie metodou neutronového záchytu (bor-10) metody   MeSH
• termoluminiscenční dozimetrie přístrojové vybavení   metody   MeSH
• záření gama * MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

• Klíčová slova
• dozimetrie, TL dozimetr pro oční čočku, celotělový OSL dozimetr, amnealing TLD, citlivost TLD, kalibrační křivka,
• MeSH
• dávka záření MeSH
• ionizující záření MeSH
• katarakta MeSH
• lidé MeSH
• monitorování radiace MeSH
• oční čočka účinky záření   MeSH
• rentgenové záření MeSH
• termoluminiscenční dozimetrie metody   využití   MeSH
• Check Tag
• lidé MeSH

NaCl is a cheap and widely available material. This study investigated the potential of NaCl in the form of a household salt as a retrospective and accident dosemeter using optically stimulated luminescence (OSL). Samples of the investigated household salt were stimulated using blue light of linearly modulated power. Attention was concentrated on sensitivity, dose dependence of the OSL signal, fading, optimisation of the read-out procedure and application of analytical protocols that do not require a specific calibration. A potential of NaCl as a complementary dosemeter within emergency preparedness was considered. The behaviour of the OSL signal observed was found to be favourable for dosimetry.

• MeSH
• chlorid sodný chemie   MeSH
• dávka záření MeSH
• kalibrace MeSH
• luminiscence MeSH
• radiometrie metody   MeSH
• retrospektivní studie MeSH
• senzitivita a specificita MeSH
• termoluminiscenční dozimetrie metody   MeSH
• úrazy a nehody MeSH
• vztah dávky záření a odpovědi MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH