In this paper, the radon concentrations in the houses of (10) locations were measured using real-time continuous radon monitor RAD-7 detector together with estimating the corresponding female and male organ doses using Monte Carlo (MC) simulation software at Al- Najaf city-Iraq. It is found that the radon concentrations varied from (8.75±1.1 Bq/m3) to (32.32±4.0 Bq/m3 with an average (20.57±2.90 Bq/m3). The resulted data for male reveal that the bladder received the highest dose at 9.78E-05 μGy/h in Missan, while the salivary gland was noticed to have the highest dose in each of Jmhorria, Adalh, Saad and Milad regions with dose rates of 4.65E-05, 3.59E-05, 5.72E-05 and 3.45E-05 μGy/h respectively. In Asskry Najaf regions the highest dose was seen to be with the Lung with 9.30E-05 μGy/h. In Asskiry Kufa and Mutnaby the highest organ doses were attributed to the bone surface at 9.73E-05 and 9.62E-05 μGy/h respectively. In Tmoz and Sirai regions, the highest organ doses were with Extrathor airways and thyroid at 6.64E-05 and 9.65E-05 μGy/h respectively. By contrast, the female findings reveal the doses for all organs and across all considered neighborhoods ranged from 1. E-04 μGy/h to 9E-05 μGy/h. Finally, it can be concluded that all results of radon concentrations in ten locations samples were within the range allowed according to ICRP. The organ doses seem to be very low which in turn reduce the concern realted to the effect of radiation.

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Reducing the number of radiotherapy sessions is the primary goal of the radiotherapist domain. One of the most promising ways is to achieve this goal by adding nanoparticles as a contrast agent to the target where radiation is applied. The contribution of the nanoparticles will appear Sensitivity Enhancement Ratio (SER). SER is the ratio between the number of cancer cells destroyed by the presence of the contrast agent and the number of cells destroyed by the absence of the contrast agent for the same dose. Increasing the amount of SER indicates the increase in the number of destroyed cells compared with the number of destroyed cells in the absence of contrast agent. In this research, silver nanoparticles (AgNPs) were used as a contrast agent for adipose tissue cancer together with photons beam whose energy range from (2-15) MeV that applied to the adipose tissue loaded with AgNPs. The results showed an increase in the SER (1.44 with an energy of 15 MeV ), which would indicate a reduction in the number of radiotherapy sessions to become from five to three weeks depending on the energy of applied photon where the normal radiotherapy sessions are seven weeks.

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