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ABSTRACT: Indoor radon was systematically surveyed in the town of Niksic-the second largest town in Montenegro-which has some of its settlements built above red bauxite deposits. The radon concentrations were measured in 55 homes in 2002/03, in the summer and winter period, using CR-39 etched track detectors. The average annual radon concentrations were found to be lognormally distributed (geometric mean = 66.2 Bq m(-3), geometric standard deviation = 3.0) within the range from 10 to 966 Bq m(-3), with arithmetic mean of 122.7 Bq m(-3) and median of 61.7 Bq m(-3). Although the annual mean radon concentrations above the action level of 400 Bq m(-3) are found only in four dwellings, the indoor radon levels in the town of Niksic are relatively high when compared with the average in the South European countries, as well as with indoor radon levels in other regions in Montenegro.
Radiation Protection Dosimetry 02/2007; 124(4):385-91. · 0.82 Impact Factor
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H Yanagie,
K Maruyama,
T Takizawa,
O Ishida,
K Ogura,
T Matsumoto,
Y Sakurai,
T Kobayashi,
A Shinohara,
J Rant,
J Skvarc, R Ilic,
G Kuhne,
M Chiba,
Y Furuya,
H Sugiyama,
T Hisa,
K Ono,
H Kobayashi,
M Eriguchi
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ABSTRACT: Tumour cell destruction in boron neutron-capture therapy (BNCT) is due to the nuclear reaction between (10)B and thermal neutrons. It is necessary for effective BNCT therapy to accumulate (10)B atoms in the tumour cells. The delivery system consisted of polyethylene-glycol (PEG) binding liposomes (DPPC/cholesterol/DSPC-PEG2000) with an entrapped (10)B-compound and we evaluated the cytotoxic effects of intravenously injected (10)B-PEG-liposomes on human pancreatic carcinoma xenografts in nude mice with thermal neutron irradiation. After thermal neutron irradiation of mice injected with (10)B-PEG-liposomes, growth of AsPC-1 tumours was suppressed relative to controls. Injection of (10)B-PEG-liposomes caused the greatest tumour suppression with thermal neutron irradiation in vivo. These results suggest that intravenous injection of (10)B-PEG-liposomes can increase the retention of (10)B atoms by tumour cells, causing suppression of tumour growth in vivo, after thermal neutron irradiation.
Biomedecine [?] Pharmacotherapy 02/2006; 60(1):43-50. · 2.00 Impact Factor
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ABSTRACT: Stacks consisting of thin CR-39 sheets sandwiched between thick lucite and water absorbers were perpendicularly bombarded by 12C ions at 200 and 244 MeV/u. Track radius distributions representing the charge composition of the fragmented beams were automatically measured by a particle track analysis system. After analysis of the nuclear charge distributions, the total charge removal cross-sections and elemental production cross-sections of fragments with atomic numbers from 5 to 3, were obtained down to the lower energies (approximately 50 and 100 MeV/u, respectively). It has been found that the measured total charge removal cross-section agrees with theoretical predictions within approximately 10% and very well with previous experiments in corresponding energy regions. Two model calculations for production of B fragment are in good agreement with our measured data while a third model overestimates it by approximately 12%. Theoretical cross-sections for Be and Li fragments differ strongly among the different models and from measured values.
Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 02/1999; 159(4):233-40. · 1.21 Impact Factor
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ABSTRACT: This paper reports on a search conducted for neutrons, protons, tritons, {sup 3}He ions, gamma rays, and ion-induced X-rays from deuterium-deuterium (D-D) fusion in cast (36-g), annealed (4-g), and cold-rolled (16-g) palladium specimens and a palladium hydrogen thermal valve (11 g) electrochemically charged with deuterium. The palladium cathodes were charged in an electrolytic cell (0.1 M LiOD (99.8% deuterium), platinum anode) at a current density of 25 mA/cm{sup 2} from 20 to 140 h.
Fusion Technology; (United States). 10/1990; 18:3.
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ABSTRACT: The equipment and method for large scale radon monitoring using etched track detectors developed in the J. Stefan Institute is reviewed. This review comprises a description of: (1) two highly sensitive ("1 and "10 kBq.m-3.h) radon dosemeters, (2) devices for chemical and electrochemical etching, and (3) a microcomputer-assisted system for counting nuclear tracks. This is followed by a brief summary of indoor radon distribution measurements in some regions of Slovenia (the two biggest towns, an area with high natural radioactivity, an area in the vicinity of a coal fired power plant) and outdoor radon monitoring in the vicinity of the uranium mine Zirovski vrh. Results obtained from 326 dwellings show that the median value of radon concentration in Slovenian homes is "70 Bq.m-3. The median value of radon concentration in 24 old houses in Poljanska Valley, characterised by high natural radioactivity, was found to be "230 Bq.m-3. The annual outdoor average radon concentration in the villages surrounding the uranium mine Xirovski vrh was found to be "20 Bq.m-3. The outdoor radon concentration in other regions of Slovenia is from 5 to 20 Bq.m-3 depending on mircroclimatic and geological conditions.
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ABSTRACT: The first systematic indoor radon measurements on the Montenegrin Coast were carried out in the period 2002–2003, when 107 randomly selected homes in urban settlements were surveyed using CR-39 track-etch detectors, twice a year, each time for about 6 months. None of the measured radon concentrations exceeded the action level of . The annual average radon concentrations were found to be lognormally distributed (, GSD=2.1) within the range from 3 to , with arithmetic mean of , and median of . The average effective dose due to exposure to radon in urban homes on the Montenegrin Coast is estimated to be .
Radiation Measurements.
