Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 4

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Ionisation Chambers Containing Boron as Neutron Detectors in Mixed Radiation Fields

100%
Gryziński M., Tulik P., Zielczyński M.
Polish Journal of Medical Physics And Engineering
|
2007
|
vol. 13
|
issue 2
79-91
EN
The paper presents a newly designed ionisation chambers containing boron, operated in the initial recombination regime. The chambers were either filled with BF3 or the chamber electrodes were covered with B4C. The chambers can be placed in paraffin moderators. The sensitivity of the chambers was investigated depending on gas pressure, moderator thickness and polarizing voltage. The results showed that it was possible to obtain nearly the same sensitivity of the chamber to H* (10) for photons and neutrons in restricted energy range, however further investigations are needed to make an optimum design. The examples of applications for dosimetric measurements in mixed radiation fields near medical linear accelerator and in the vicinity of high-energy proton accelerator are presented.
2
Content available remote

A Sensitive Neutron Counter with a High-Pressure Ionization Chamber Filled with BF3

100%
Zielczyński M., Rusinowski Z., Tulik P.
Polish Journal of Medical Physics And Engineering
|
2007
|
vol. 13
|
issue 3
157-162
EN
A ionization chamber, filled with 10BF3 and operating in a pulse mode, was investigated as a possible sensitive pocket detector for detection of neutrons at low flux densities. The chamber is 85 mm long and 19 mm in diameter. The measured sensitivity of the chamber placed near the human body (in the belt), without any additional moderator was of the order of 1 pulse/n cm-2 in the radiation field of a 252Cf source.
3
Content available remote

A Method of determination of ambient quality factor of fast neutrons in mixed radiation fields using advanced recombination methods

100%
Zielczyński M., Golnik N., Gryziński M.
Polish Journal of Medical Physics And Engineering
|
2011
|
vol. 17
|
issue 4
189-206
PL
Przedstawiono sposób wyznaczania przestrzennego współczynnika jakości neutronów prędkich, Qn*(10), w polu promieniowania mieszanego o nieznanym, lecz ograniczonym, widmie energii neutronów. W tym sposobie wykorzystuje się korelacje między wartościami Qn*(10), obliczonymi metodą Monte Carlo dla neutronów monoenergetycznych, a parametrami doświadczalnych charakterystyk nasycenia komory rekombinacyjnej, umieszczonej we wzorcowych polach neutronów monoenergetycznych wraz z towarzyszącym promieniowaniem gamma. Omija się przy tym szereg niepewności, m.in. związanych z brakiem pełnej odpowiedniości między współczynnikiem jakości promieniowania a parametrami, od których zależy lokalna rekombinacja jonów, a także z brakiem pełnej odpowiedniości konstrukcji komory rekombinacyjnej z tzw. kulą MKJR (ang. ICRU) definiującą wielkości operacyjne H*(10) i Q*(10).
EN
The paper presents a method for determination of ambient quality factor for fast neutrons, Qn*(10), in mixed radiation fields with unknown neutron energy spectrum of limited energy range. The method uses a correlation between the Qn*(10) values, calculated by Monte-Carlo method for monoenergetic neutrons, with parameters of saturation curves of the recombination chamber, determined experimentally in the fields of monoenergetic neutrons and accompanying gamma radiation. In such a way, a number of discrepancies can be omitted, among them those associated with limited conformity between radiation quality factor and parameters of initial recombination of ions, as well as between construction of the recombination chamber and ICRU sphere, for which the quantities H*(10) and Q*(10) were defined.
4
Content available remote

Measurements of high level of iodine activity in thyroid with different radiation meters

76%
Ośko J., Golnik N., Pliszczyński T., Sosnowiec R., Umaniec M., Zielczyński M.
|
EN
Iodine activity in thyroid of female patient was measured with different radiation meters in order to estimate a possibility to use them in case of radiation accident. Two series of measurements were performed - first after diagnostic and second after therapeutic administration of iodine to the patient. The isotope activities were higher than those registered during routine radiation monitoring and similar to the activities which could be registered after radiation accident. The studies showed that simple dose rate meters may serve for identification and selection of contaminated persons which should be later subjected to the measurements with especially dedicated equipment. The initial measurements can be performed outside laboratory.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.