Radioprotection No 59-4 | Page 82

E . Srinivasa et al .: Radioprotection 2024 , 59 ( 4 ), 317 – 326 321
Table 2 . Comparison of the average activity concentration of 238 U , 226 Ra , 232 Th , and 40 K recorded in literature for different region soil samples . Country Activity concentration ( Bq kg �1 ) Reference
238 U
226 Ra
232 Th
40 K
World average
35
32
45
420
( UNSCEAR , 2000 )
Indian Average
31
29
64
400
( UNSCEAR , 2000 )
Chikmagalur district
–
36
51
566
( Srinivasa et al ., 2022 )
Bangalore rural
–
40
93
750
( Ningappa et al ., 2008 )
Coastal Karnataka
–
35
29
117
( Narayana et al ., 2001 )
Bangalore
–
26
53
635
( Prasad et al ., 2008 )
Mandya
–
40
72
639
( Shivakumara et al ., 2014 )
Granite region of Karnataka
–
28
60
117
( Sannappa et al ., 2010 )
Kaiga
–
31
27
159
( Karunakara et al ., 2001 )
Gogi region
–
36
85
859
( Yashodhara et al ., 2011 )
Uttara Kannada district
–
34
45
198
( Suresh et al ., 2022 )
North Karnataka
–
18
38
546
( Kerur et al ., 2011 )
Tumkur and Ramanagara district
–
41
86
869
( Srilatha et al ., 2015 )
Kolar district ( KGF )
–
27
63
818
( Umesh Reddy et al ., 2017 )
Hassan District
42
39
58
592
Present study
Fig . 2 . ( a ) Frequency distribution of 226 Ra in soil . ( b ) Frequency distribution of 232 Th in soil . ( c ) Frequency distribution of 40 K in soil .