Abstract:
:A single-parameter geometry to describe soil is achieved for Monte Carlo calculation of absorbed dose rate in air for photon emitters from natural radionuclides. This optimised geometry based on physical assumptions consists of the soil part whose emitted radiation has a given minimum probability to reach the detector. This geometry was implemented in Geant4 toolkit and a significant reduction in computation time was achieved. Simulation tests have shown that for soil represented by a cylinder of 40 m radius and 1 m deep, >98% of the calculated dose rate conversion coefficients in air at 1 m above the ground is generated by only 6% of the soil volume in the case of uniform distribution of radioactivity, and >99.2% of the calculated dose rate for an exponential distribution. When the soil is represented by the entire optimised geometry, 99% of the conversion coefficients values are reached for a soil depth of 1 m and 100% for that of approximately 2 m.
journal_name
Radiat Prot Dosimetryjournal_title
Radiation protection dosimetryauthors
Askri B,Manai K,Trabelsi A,Baccari Bdoi
10.1093/rpd/ncm426subject
Has Abstractpub_date
2008-01-01 00:00:00pages
279-88issue
3eissn
0144-8420issn
1742-3406pii
ncm426journal_volume
128pub_type
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