Boron neutron capture therapy(BNCT)is recognized as a precise binary targeted radiotherapy technique that effectively eliminates tumors through the^(10)B(n,α)^(7)Li nuclear reaction.Among various neutron sources,acce...Boron neutron capture therapy(BNCT)is recognized as a precise binary targeted radiotherapy technique that effectively eliminates tumors through the^(10)B(n,α)^(7)Li nuclear reaction.Among various neutron sources,accelerator-based sources have emerged as particularly promising for BNCT applications.The^(7)Li(p,n)^(7)Be reaction is highly regarded as a potential neutron source for BNCT,owing to its low threshold energy for the reaction,significant neutron yield,appropriate average neutron energy,and additional benefits.This study utilized Monte Carlo simulations to model the physical interactions within a lithium target subjected to proton bombardment,including neutron moderation by an MgF_(2)moderator and subsequent BNCT dose analysis using a Snyder head phantom.The study focused on calculating the yields of epithermal neutrons for various incident proton energies,finding an optimal energy at 2.7 MeV.Furthermore,the Snyder head phantom was employed in dose simulations to validate the effectiveness of this specific incident energy when utilizing a^(7)Li(p,n)^(7)Be neutron source for BNCT purposes.展开更多
In the present work, radon gas concentrations in different dwellings in Baghdad governorate are measured by using RAD-7 detector. The results have shown that, the radon gas concentrations ranged between (40.67 ± ...In the present work, radon gas concentrations in different dwellings in Baghdad governorate are measured by using RAD-7 detector. The results have shown that, the radon gas concentrations ranged between (40.67 ± 3.1 Bq/m<sup>3</sup>) to (190.00 ± 2.7 Bq/m<sup>3</sup>) with an average value (113.66 ± 30.2 Bq/m<sup>3</sup>);in the first one we draw the map radiations for indoor radon gas concentrations in Baghdad governorate. We would like to mention that the present study is considered to be very important and vital because it is concerned with people health and safety in the first place.展开更多
Coconut water has several uses that are beneficial to humans, mainly because of its nutritional and medicinal properties. In this study coconut water samples were collected from the fresh mature coconuts and from pack...Coconut water has several uses that are beneficial to humans, mainly because of its nutritional and medicinal properties. In this study coconut water samples were collected from the fresh mature coconuts and from packaged processed coconut water to measure the radon concentrations in them. The results were used to estimate the annual effective radiation dose to the general adult population from ingestion of coconut water. The samples were analyzed for radon concentrations using the Durridge RAD-7 radon detector. The results of measured radon concentrations for the fresh mature coconut were ranged from 381.10 Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span> to 1716.80 Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span>. The results for packaged processed coconut samples ranged from 68.08 Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span> to 556.85 Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span>. The mean values for the samples were (1081.40 and 222.78) Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span> for the fresh and processed samples, respectively. The estimated mean annual effective doses (AED) due to ingestion of coconut water were 0.41 and 0.08 μSv·y<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-1</sup></span> for fresh and processed samples, respectively. These values are significantly lower than the safe limits recommended by the World Health Organization and the European Commission of 0.1 mSv·y<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-1</sup></span> and the maximum contamination level (MCL) of 11,000 Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span> by the United States Environmental Protection Agency and so do not constitute a risk to consumers of coconut water.展开更多
文摘Boron neutron capture therapy(BNCT)is recognized as a precise binary targeted radiotherapy technique that effectively eliminates tumors through the^(10)B(n,α)^(7)Li nuclear reaction.Among various neutron sources,accelerator-based sources have emerged as particularly promising for BNCT applications.The^(7)Li(p,n)^(7)Be reaction is highly regarded as a potential neutron source for BNCT,owing to its low threshold energy for the reaction,significant neutron yield,appropriate average neutron energy,and additional benefits.This study utilized Monte Carlo simulations to model the physical interactions within a lithium target subjected to proton bombardment,including neutron moderation by an MgF_(2)moderator and subsequent BNCT dose analysis using a Snyder head phantom.The study focused on calculating the yields of epithermal neutrons for various incident proton energies,finding an optimal energy at 2.7 MeV.Furthermore,the Snyder head phantom was employed in dose simulations to validate the effectiveness of this specific incident energy when utilizing a^(7)Li(p,n)^(7)Be neutron source for BNCT purposes.
文摘In the present work, radon gas concentrations in different dwellings in Baghdad governorate are measured by using RAD-7 detector. The results have shown that, the radon gas concentrations ranged between (40.67 ± 3.1 Bq/m<sup>3</sup>) to (190.00 ± 2.7 Bq/m<sup>3</sup>) with an average value (113.66 ± 30.2 Bq/m<sup>3</sup>);in the first one we draw the map radiations for indoor radon gas concentrations in Baghdad governorate. We would like to mention that the present study is considered to be very important and vital because it is concerned with people health and safety in the first place.
文摘Coconut water has several uses that are beneficial to humans, mainly because of its nutritional and medicinal properties. In this study coconut water samples were collected from the fresh mature coconuts and from packaged processed coconut water to measure the radon concentrations in them. The results were used to estimate the annual effective radiation dose to the general adult population from ingestion of coconut water. The samples were analyzed for radon concentrations using the Durridge RAD-7 radon detector. The results of measured radon concentrations for the fresh mature coconut were ranged from 381.10 Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span> to 1716.80 Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span>. The results for packaged processed coconut samples ranged from 68.08 Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span> to 556.85 Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span>. The mean values for the samples were (1081.40 and 222.78) Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span> for the fresh and processed samples, respectively. The estimated mean annual effective doses (AED) due to ingestion of coconut water were 0.41 and 0.08 μSv·y<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-1</sup></span> for fresh and processed samples, respectively. These values are significantly lower than the safe limits recommended by the World Health Organization and the European Commission of 0.1 mSv·y<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-1</sup></span> and the maximum contamination level (MCL) of 11,000 Bq·m<span lang="EN-US" style="font-size:9pt;font-family:Tahoma, sans-serif;"><sup>-3</sup></span> by the United States Environmental Protection Agency and so do not constitute a risk to consumers of coconut water.
