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Calibration of the RSS-131 high efficiency ionization chamber for radiation dose monitoring during plasma experiments conducted on plasma focus device

100%
Szewczak K., Jednoróg S.
Open Physics
|
2014
|
vol. 12
|
issue 10
719-724
EN
Plasma research poses a radiation hazard. Due to the program of deuterium plasma research using the PF-1000 device, it is an intensive source of neutrons (up to 1011 n · pulse −1) with energy of 2,45 MeV and ionizing electromagnetic radiation with a broad energy spectrum. Both types of radiation are mostly emitted in ultra-short pulses (∼100 ns). The aim of this work was to test and calibrate the RSS-131 radiometer for its application in measurements of ultra-short electromagnetic radiation pulses with broad energy spectrum emitted during PF-1000 discharge. In addition, the results of raw measurements performed in the control room are presented.
2
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Occupational exposure to Am-Be neutron calibration source mounted in OB26 shielding container

100%
Szewczak K., Jednorog S.
Nukleonika
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2014
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vol. 59
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issue 3
97-103
EN
Laboratory for Dosimetric and Radon Instruments Calibration which is a part of Central Laboratory for Radiological Protection (CLRP) in Warsaw is equipped with 241Am-Be neutron calibration source with activity of 185 GBq since 1999. The capsule was mounted in the OB26 type shielding container. The control room is separated from the above source by a concrete wall of 0.5 m in thickness. The calibration hall is adjacent to one side of the offi ce room. To comply with the requirements of the radiological protection system, the occupational exposure of persons that are working both in the offi ce and control room needs to be assessed. Two methods were involved for ambient dose equivalent rate determination. The active instrument measurements (AIMs) performed with the Berthold LB6411 neutron probe and the Monte Carlo simulation method (MCS) based on MCNP5 code. These estimations were completed for fi ve reference points. Additionally the γ radiation component was measured by RSS131 ionisation chamber. An increased value of the ambient dose equivalent rate from neutrons was observed in two reference positions. The fi rst observation was done in the control room while the second one in the offi ce room. Expected individual dose equivalents were evaluated based on the results of the AIM and on the expected working time in particular reference points. The annual individual dose equivalent associated with calibration activities using mentioned neutron source was estimated at maximum 0.8 mSv.
3
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Establishment of in vitro 192Ir γ-ray dose-response relationship for dose assessment by the lymphocyte dicentric assay

81%
Kowalska M., Meronka K., Szewczak K.
Polish Journal of Medical Physics And Engineering
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2012
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vol. 18
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issue 1
11-21
EN
In vitro dose-response relationships are used to describe the relation between dicentric chromosomes and radiation dose for human peripheral blood lymphocytes. The dicentric yield depends on both the dose and the radiation quality. Thus, for reliable dose estimation in vitro dose responses must be determined for different radiation qualities. This paper reports the work for setting up the relationship for the dicentric production in the lymphocytes exposed in vitro to 192Ir g-rays at Central Laboratory for Radiological Protection (CLOR). In a case of a radiation accident in industrial radiography using 192Ir sealed sources, this will be the basis for the indirect evaluation of the g-ray dose to which an accidental victim was exposed.
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