Abstract
This research included measuring the concentrations of natural radioactive isotopes U-238 and Th-232 and radiation dose rates for selected areas of Missan province, GR-460 system was used which has the potential to measure the concentrations of natural radioactive isotopes in (ppm) unit and measuring the radiation dose rates in μR/h unit. It was also used with the system the mobile device FH-40 which measures the radiation dose rates in units μSμ/h the measurement results showed the absence of a significant increase in the U-238 and Th-232 concentration where the concentration of isotopes of U-238 and natural Th-232 (3.35-5.46) ppm respectively it is authorized and universally accepted. In terms of radiation dose rates it ranged between 45-65ոSv/հ by GR-460 system and FH-40 device and all these values are within the natural background radiation. Except for one outlying villages that affiliate to the Kahla area were found the radioactive source type 137Cs was left in a swamp of water rancid. Dose rate reached about 6 meters distance from the source 5.3 mSv/h by FH-40 device and GR-460 system 90.6 μR/h where equivalent 815 ոSvհ. The radioactive source has been transferred safely to the main store in AlTuwaitha site.
Highlights
The natural radioactivity or what is known as background radiation, is very important for the population's exposure to radiation and the many countries of the world measuring the exposure rate that caused by natural radiation for various purposes including epidemiological studies and selection of nuclear facilities sites and emergency plans
Human exposes to multiple sources of radiation most important natural radiation sources which include ground origin of radionuclides, a uranium series U-238 and thorium series Th-232 and potassium K-40 that are found in the crust of the earth since the creation because of the long halflives [1]
The instruments 1- GR - 460 system was used in the radiological survey operations as it allows the system to show radiation dose rate in units μR/հ and the possibility to identify the radioactive source's identity through the appearance of the source name and spectrum its energies and the system is a detector Sodium Iodide (NaI) with two crystal each one 256 Lang size becomes a total volume of 512 lange cubic where offers the possibility and efficiency of high detecting to cover a wide area
Summary
The natural radioactivity or what is known as background radiation, is very important for the population's exposure to radiation and the many countries of the world measuring the exposure rate that caused by natural radiation for various purposes including epidemiological studies and selection of nuclear facilities sites and emergency plans. Key words Radiation dose, Concentration of natural isotopes, Missan Province.
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