Active mobile dosimetry unit (Liulin), passive plastic nuclear track detectors (PNTD) and thermoluminescent detectors (TLD) were exposed in a C290 MeV/n beam at HIMAC-BIO (NIRS, Japan). Two different types of beam configuration were used--monoenergetic beam (MONO) and spread-out Bragg peak (SOBP); the detectors were placed at several depths from the entrance up to the depths behind the Bragg peak. Relative response of TLDs in beams has been studied as a function of the depth, and it was re-proved that it can depend on the linear energy transfer (LET). Liulin measures energy deposition in Si; the spectra of energy deposited in Si can be transformed to the spectra of lineal energy or LET. PNTDs are able to determine the LET of registered particles directly. The limitation of both methods is in the range in which they can determine the LET-Liulin is able to measure perpendicularly incident charged particles up to ∼35 keV/µm (in water), PNTD can measure from ∼7 to 400 keV/µm, independently of the registration angle. The results from both methods are compared and combined for both beams' configuration, and a good agreement is observed.
- MeSH
- analýza selhání vybavení MeSH
- částice - urychlovače přístrojové vybavení MeSH
- design vybavení MeSH
- lineární přenos energie MeSH
- radiometrie přístrojové vybavení MeSH
- radioterapie těžkými ionty MeSH
- těžké ionty MeSH
- Publikační typ
- časopisecké články MeSH
- hodnotící studie MeSH
- srovnávací studie MeSH
- Geografické názvy
- Japonsko MeSH
One of the topics which forms part of CONRAD project addresses the problems related to the dosimetry of complex-mixed radiation fields at workplaces. This topic was included in work package (WP) 6. WP 6 was established to co-ordinate research activities in two areas:the development of new techniques and the improvement of current techniques for characterisation of complex workplace fields (including high-energy fields and pulsed fields): measurement and calculation of particle energy and direction distributions (Subgroup A); and model improvements for dose assessment of solar particle events (Subgroup B). In both cases in order to aid the research, WP 6 increases the efficiency of resource utilisation, and facilitates the technology transfer to practical application and for the development of standards. This contribution presents a general overview of activities of SG A; specific results related to the benchmark experiment at GSI Darmstadt are presented separately, and will be published in other way. As far as the results acquired in the frame of the SG B activities, these are presented in the meeting held as part of EURADOS AM 2008.
- MeSH
- dávka záření MeSH
- Evropská unie MeSH
- lidé MeSH
- metoda Monte Carlo MeSH
- monitorování radiace metody MeSH
- počítačová simulace MeSH
- pracovní expozice MeSH
- sluneční aktivita MeSH
- teoretické modely MeSH
- vystavení vlivu životního prostředí MeSH
- záření MeSH
- Check Tag
- lidé MeSH
- Geografické názvy
- Švýcarsko MeSH
The neutron contribution to the spacecraft crew exposure could represent an important part of the total dose equivalent value. The determination of this contribution represents a rather complex and difficult task, both through experimental and theoretical estimation. This paper will present an attempt to determine the neutron contribution onboard the International Space Station and Foton capsule using the data measured by means of a Si-diode based energy deposition spectrometer. As such a spectrometer, the MDU-Liulin equipment, developed in one of our laboratories was used. The equipment allows the data accumulated during the passage in or out of the South Atlantic Anomaly (SAA). In this paper, only the data obtained out of the SAA were analysed, assuming that the neutron spectra are similar to those onboard aircraft and/or at the CERF high-energy radiation field. The excess of deposited energy in the region above 1 MeV, when comparing with the aircraft field, was expected to represent the primary high-energy charged particles. Total dosimetry characteristics obtained in this way are in reasonable agreement with other data, neutron contribution representing approximately 40% of the total dose equivalent for the flight duration outside of the SAA.
- MeSH
- analýza selhání vybavení MeSH
- dávka záření MeSH
- design vybavení MeSH
- kosmické záření MeSH
- kosmický let MeSH
- monitorování radiace metody přístrojové vybavení MeSH
- neutrony MeSH
- pracovní expozice analýza MeSH
- radiační ochrana metody přístrojové vybavení MeSH
- reprodukovatelnost výsledků MeSH
- senzitivita a specificita MeSH
ICRP Publication 60 recommended that the radiation exposure due to the cosmic component at high altitudes be considered when appropriate as part of occupational exposure to the radiation. The recommendation was incorporated to the Czech regulation in 1997, and the studies on how to perform individual dosimetry of Czech companies aircraft crew started immediately. The individual monitoring values were calculated using the Transport code CARI. The results obtained since the beginning have been recalculated, now with the version 6. The information on the flight schedules and the participation of aircraft crew in the flight were received from the air company. Routine individual dosimetry had started in 1998. Main results for the period 1998-2003 are as follows: both relative frequencies, as well as, average annual effective doses vary with the company and with the year, without any evident general tendency; the average annual values of E were between 1.5 and 2 mSv; and collective effective dose increased regularly, from approximately 1.5 manSv to >2.2 manSv. More detailed analysis is presented, including the verification of the procedure by a series of onboard experimental measurements.
- MeSH
- analýza selhání vybavení MeSH
- dávka záření MeSH
- design vybavení MeSH
- financování organizované MeSH
- internacionalita MeSH
- kosmické záření MeSH
- letectví MeSH
- monitorování radiace metody MeSH
- pracovní expozice analýza MeSH
- radiační ochrana metody MeSH
- reprodukovatelnost výsledků MeSH
- senzitivita a specificita MeSH
- Geografické názvy
- Česká republika MeSH
- MeSH
- analýza selhání vybavení MeSH
- hodnocení rizik MeSH
- lidé MeSH
- neutrony MeSH
- radiační ochrana metody MeSH
- radiometrie normy přístrojové vybavení MeSH
- únik radioaktivních látek MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- srovnávací studie MeSH
- Geografické názvy
- Česká republika MeSH
- MeSH
- finanční podpora výzkumu jako téma MeSH
- kosmické záření MeSH
- letectví pracovní síly MeSH
- lidé MeSH
- obsah radioaktivních látek v organizmu MeSH
- radiační účinky MeSH
- radiometrie metody využití MeSH
- Check Tag
- lidé MeSH
- Geografické názvy
- Česká republika MeSH
