State primary standards of equivalent dose and equivalent dose rate units of neutron radiation

1976 ◽  
Vol 19 (3) ◽  
pp. 404-408
Author(s):  
A. P. Yanovskii ◽  
M. F. Yudin ◽  
L. A. Popruzhko ◽  
V. V. Frolov ◽  
Yu. D. Lysak
Keyword(s):  
Dose Rate ◽  
Neutron Radiation ◽  
Equivalent Dose ◽  
Equivalent Dose Rate ◽  
Primary Standards

Neutron Equivalent Dose Rate Measurements of Gypsum-Waste Tire Rubber Layered Structures

2013 ◽  
Vol 18 (6) ◽  
pp. 423-429 ◽  
Author(s):  
Turgay Korkut ◽  
Zeynep Itır Umaç ◽  
Bünyamin Aygün ◽  
Abdulhalik Karabulut ◽  
Sinan Yapıcı ◽  
...  
Keyword(s):  
Dose Rate ◽  
Layered Structures ◽  
Equivalent Dose ◽  
Tire Rubber ◽  
Equivalent Dose Rate ◽  
Waste Tire ◽  
Waste Tire Rubber

scholarly journals CHANGES OF NATURAL IONIZING RADIATION IN ANTHROPOGENIC OBJECTS

2005 ◽  
Vol 13 (3) ◽  
pp. 103-107
Author(s):  
Viktorija Bogdevičiene ◽  
Milda Pečiuliene ◽  
Aloyzas Girgždys
Keyword(s):  
Ionizing Radiation ◽  
Dose Rate ◽  
Specific Activity ◽  
Anthropogenic Activities ◽  
Ventilation System ◽  
Ground Level ◽  
Equivalent Dose ◽  
Field Soil ◽  
Equivalent Dose Rate ◽  
Arable Field

Dosimetric investigations that were performed in various geographic places, mostly connected to anthropogenic activities, are observed in this work. Equivalent dose rate was measured with a radiometer SRP‐68, 0,3 m above the point of investigation. It is determined that equivalent dose rate changes from 97 nSv/h measured above a non‐arable field soil to 219 nSv/h measured in a tunnel. The hignest values of equivalent dose rate are in closed buildings with a bad ventilation system. It is noticed that the specific activity of 40K and 226Ra changes depending on the depth of a trench. The specific activity of 40K is the highest at the deepest point (441 Bq/kg) of a trench; the highest specific activity of 226Ra is at the ground level (37 Bq/kg).

scholarly journals EVALUATION OF FLUCTUATION OF EQUIVALENT DOSE RATE DUE TO RADIONUCLIDE RADIATION IN BUILDINGS

2006 ◽  
Vol 14 (4) ◽  
pp. 207-213 ◽  
Author(s):  
Milda Pečiulienė ◽  
Gražina Grigaliūnaitė-Vonsevičienė ◽  
Aloyzas Girgždys
Keyword(s):  
Ionizing Radiation ◽  
Dose Rate ◽  
Building Materials ◽  
Natural Radionuclides ◽  
Equivalent Dose ◽  
Natural Background ◽  
Empirical Dependence ◽  
Equivalent Dose Rate ◽  
Natural Gamma ◽  
Gamma Field

Radionuclide gamma radiation in building materials twist natural gamma field, therefore, dosimetry investigation of ionizing radiation of natural radionuclides was carried out near various building constructions. It was detected that equivalent dose rate of natural radionuclides increases exponentially (this empirical dependence stays in force to 10–15 meters from a building) while approaching a building under investigation. It was measured that buildings increase ionizing radiation approximately 1,5–2 times. Wooden buildings are an exception. They change natural background to 5 %. The values of equivalent dose rate in buildings are distributed according to Gaussian distribution. The measured equivalent dose rate is 1,5 times smaller in wooden houses then in block, silicate and ceramic bricks houses.

scholarly journals Study the Effect of Scattering and Disperse Radiation on Equivalent Dose Rate for Al & Pb Shields

2011 ◽  
Vol 8 (2) ◽  
pp. 261-268
Author(s):  
Baghdad Science Journal
Keyword(s):  
Dose Rate ◽  
Atomic Number ◽  
Equivalent Dose ◽  
Secondary Radiation ◽  
Dose Equivalent ◽  
Equivalent Dose Rate ◽  
Equivalent Rate

The effects of scattering and secondary radiation generated inside the material on dose equivalent rate where studied using Co60 and Cs137 sources of activity (199.8 , 177.6) MBq , respectively for different thicknesses of Al , Pb and Pb- glass . The results showed that the equivalent rate increases when the effect of scattering was included for Al and Pb shields with cobalt-60 source of energy 1.25 MeV ; and decreases for Pb shield with Cs-137 source of energy 0.662MeV .The results showed also that the atomic number of The material effects the dose equivalent rate . The Pb-glass shield was found to be more efficient in absorption than other shields.

scholarly journals Natural Radioactivity and Radon Exhalation from Building Materials in Underground Parking Lots

2021 ◽  
Vol 11 (16) ◽  
pp. 7475
Author(s):  
Dainius Jasaitis ◽  
Milda Pečiulienė
Keyword(s):  
Dose Rate ◽  
Building Materials ◽  
Activity Concentration ◽  
Gamma Spectroscopy ◽  
Natural Radionuclides ◽  
Equivalent Dose ◽  
Strong Positive Correlation ◽  
Radon Exhalation ◽  
Parking Lots ◽  
Equivalent Dose Rate

The change of natural ionizing radiation and the radon exhalation rates from typical building materials in underground parking lots are presented in the article. The activity concentration of natural radionuclides 232Th, 226Ra, and 40K in six important types of construction materials, which are mostly used in Lithuania, were analyzed using high-resolution gamma spectroscopy. The highest values were found in concrete and ferroconcrete samples: 226Ra 44 and 90 Bq kg−1; 232Th 29 and 34 Bq kg−1; 40K 581 and 603 Bq kg−1. A strong positive correlation (0.88) was observed between radium activity concentration and radon concentration. The activity indexes (Iα and Iγ) and radium equivalent activity (Req) evaluating the suitability of materials for such constructions from the view of radiation safety were determined. The average values of the calculated absorbed dose rate in samples ranged from 18.24 nGy h−1 in the sand to 87.26 nGy h−1 in ferroconcrete. The calculated annual effective dose was below the limit of 1.0 mSv y−1. The values of the external and internal hazards index (Hex and Hin) were all below unity, and the values of Iγ and Iα were below the recommended levels of 0.5 and 1. Dosimetric analysis of underground parking lots was carried out. It was determined that the external equivalent dose rate caused by the 222Rn progeny radiation in the underground car parking lots varies from 17 to 30% of the total equivalent dose rate.

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