Determining The Specific Activity of Radioactive Isotopes of, 226Ra,228A, 40K, 137Cs in The Soils of Selected Areas of Najaf city - Central Iraq

This study dealt with the determination of the specific activity of radioactive isotopes,
²²⁶
Ra,
²²⁸
A, 40K,
¹³⁷
Cs in soil samples from selected areas in the city of Najaf - central Iraq, 20 samples were collected from different areas of Najaf governorate - central Iraq during the month of December 2021. An effective short-term measurement method using High Purity Germanium (HPGe) detector was used. The results showed that the values of the specific activity of natural radioactive isotopes in the soils of the study area, were the lowest value of the specific effectiveness of radium 226Ra Bk.kg
⁻¹
22.95 in sample No. S16 (Abbassi) and the highest value of 186.74 Bk.kg
⁻¹
in sample No. S17 aldasam area with an average of 39.05 Bk.kg
⁻¹
and for actinium
²²⁸
Ac, the lowest value for activity was 17.73 Bk.kg
⁻¹
in sample (S16) and the highest value was 45.15 Bk.kg
⁻¹
in sample (S10) in the wahat alruhban with an average of 29.32 Bk.kg
⁻¹
For potassium 4oK, the lowest value for the activity was 208.19 Bk.kg
⁻¹
for sample No. S16 and the highest value for 530.18 Bk.kg
⁻¹
for sample (S10) with an average of 349.86 Bk.kg
⁻¹
, and for synthetic cesium 137Cs, the highest value for the activity was 5.10 Bk.kg
⁻¹
for sample No. (S13) and the lowest value of Bk.kg- 1 was 0.34 for sample S5 with an average of 2.33 Bk.kg
⁻¹
S5. The radium equivalent was calculated and found that its value ranged between (63.46-158.53) Bk.kg
⁻¹
((S16-S10) and an average of 105.34 Bk.kg
⁻¹
4917. The values of the absorbed dose in the air were calculated and found to range between nGy.h
⁻¹
(29.64-74.05) and an average Bk.kg
⁻¹
of 48.90, the external and internal risks resulting from the level of specific efficacy in those models and it was found that the internal risks Hin ranged between 0.27) S16)) to (and (0.53.) With a rate of 0.39, and for Hex external hazards, it ranged between (0.22) (S16) to (S10) (0.44) (S10) and a rate of 0.32. In general, the study found that the values of the specific effectiveness of the radioactive isotopes,
²²⁶
Ra,
²²⁸
A, 40K,
¹³⁷
Cs, for the studied models fall within The internationally permissible limits are 32Bq/Kg,33Bq/Kg,412Bq/Kg,14.8Bq/Kg), with the exception of some study areas, especially the wahat alruhban, which recorded a noticeable increase in the values of specific activity.