چكيده لاتين :
The study was conducted for the investigation of amount of radioactivity in the barren and cultivated soil of Bio
saline Research Station in Pakka Anna, established by Nuclear Institute for Agriculture and Biology (NIAB) in 1990,
34 km, away from the city of Faisalabad, in the Punjab province of Pakistan. The studies were done on an area of
about 100 hectares of two types of virgin and fertilized saline soils. The technique of gamma ray spectrometry was
applied using HPGe (high purity germanium) gamma ray detector and a PC based MCA. Activity concentration levels
due to 4oK, 137Cs, 226Ra and 232Th were measured in 250 saline soil samples collected at a spacing of about 4 hectares
at the depth level of 0-25 em. with a step of 5 em. depth. Activity concentrations ranges of the concerned
radionuclides for both of the soils were as follows: 40K, for virgin and cultivated saline soil was 500-610.2 and Bqlkg
560.2-635.6 respectively; 137Cs, 3.57-3.63 and 1.98-5.15 Bqlkg 238U, 26.3-31.6 and 30.3-38.7 Bq/kg, and 232Th,
50.6-55.3 and 50.6-64.0 Bqlkg respectively. The absorbed dose rate in air lies in the region 63-73 nGyhי1 and 68-83
nGyhי1 for virgin and fertilized soils respectively. This indicates that this region lies in the area of higher radiation
background, while comparing with the worldsי average. The slightly higher value of dose in the fertilized farm may
be due to the use of fertilizers for cultivation. Before the radiometric measurements, chemical analysis for
concentration ofNa, Ca and Mg was also carried out along with the measurement of electrical conductivity and pH of
the soil samples.
