The study of crystalline etch products of CR-39
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Sodium hydroxide
CR-39
Nuclear track
In this research the activity of radon gas in air in Baghad governorate,Iraq, using “alpha-emitters track registration (CR-39) track detector were measured. This measurement was done for selected areas from Baghdad Governorate, The results obtained shows that the highest average concentrations for Rn-222 is (179.077 Bq/m^3) which was recorded within Al-Shaaib city and less average concentrations was (15.79 Bq/m^3) in the nearby residential area of Baghdad International Airport and the overall average concentrations is (86.508 Bq/m^3) for these regions. Then the radon concentration was measured annual effective dose calculated from radon concentration and found in range from 0.4031 mSv/y to 4.5179 mSv /y with an average value of 2.1824 mSv/y. The annual effective dose of radon was within the allowed international limits.
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CR-39
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Nuclear track
CR-39
Nuclear emulsion
Fragmentation
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Nuclear track
CR-39
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Solid state nuclear track detectors are increasingly being used to obtain the radon concentration in soil of some regions of Iraq. Several samples of soil were collected from Al – Anbar, Wasit, Diayala and Baghdad nearby sites to evaluate the radon concentration. CR – 39 plastic track detectors was used as a measurement device with cylindrical diffusion Technique. Results shows higher concentration was recorded in Al – Ramadi city which was equal to 143.1 Bq/m 3 , while the lower radon concentration was found in Diayala governorate which was equal to 21.504 Bq/m 3 . By making a comparison between results and the permissible limits of radon concentration in soil of ICRP, we found that all sites of the study are in agreement with the permissible limits.
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CR-39
Soil test
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Nuclear track
CR-39
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Alpha (finance)
CR-39
Alpha particle
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Radon and thoron activity concentration levels have been determined in the soil of Basra Governorate, Iraq. The area of the study included three districts, they are Hayy-Alabas, Hayy-Aljameeat and Almuaficia.. In this investigation CR-39 and LR-115 type2 solid state nuclear track detectors and a cylindrical plastic container technique are used. The samples are taken from the surface and the depth 1m for each location. Maximum activity of radon levels observed is (16200 Bq.m-3) in Hayy-Alabas station number 10 for soil from the surface and minimum levels is (1560 Bq.m-3) were observed in Almuaficia station number 54 for soil from the surface. The activity of radon were measured in Hayy-Aljameeat and Almuaficia which are with in normal limits according to International Commission on Radiological Protection (ICRP). The high values of radon activity are measured in many locations in Hayy-Alabas and Hayy-Aljameeat. There are many anomalous values of radon activity in the soil in some stations of Hayy-Alabas has been observed in this study. The reasons of this anomalous has been discussed. The activity concentration of thoron is smaller than the activity concentration for radon (( 220 / 222 c c A A ) <1) over all study area. The reason of this result has been discussed. The average value of the activity of thoron concentration 220 c A in the soil samples from the surface equal 2073.33 Bq.m-3, 1893.75 Bq.m-3 and 1822.22 Bq.m-3 for Hayy-Alabas, Hayy-Aljameeat and Almuaficia respectively and the average value for the soil samples from the depth 1m equal 1666.66 Bq.m-3 , 906.25 Bq.m-3 and 1103.333 Bq.m-3 for Hayy-Alabas, Hayy-Aljameeat and Almuaficia respectively.
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Traditionally, the international conference on solid state nuclear track detectors (SSNTDS) covers all types of detector from emulsions, through plastics, to glasses and minerals. However, at the 11th meeting of the series (held at Bristol University on 7–12 September 1981) 80% of the papers concerned polymeric or plastic track detectors – in particular the sensitive polymer CR-39, discovered in 1978 by scientists at Berkeley, California.
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