Using a ‘vector rotation’ technique and ‘parallel geometry’ utility to calculate the equivalent dose rate from a patient undergoing nuclear medicine procedures

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).

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

Journal of Environmental Engineering and Landscape Management ◽

10.3846/16486897.2006.9636899 ◽

2006 ◽

Vol 14 (4) ◽

pp. 207-213 ◽

Cited By ~ 2

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.

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

Baghdad Science Journal ◽

10.21123/bsj.8.2.261-268 ◽

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.

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