07 Jun It happened in 1969 last quarter.
The carbonaceous clay of the cliff section once I samples was checked out for the fluorescence. A uv lamp was used in a dark room to expose the carclay samples . Interestingly the carclay showed slight orangis fluorescence and indicator of U3O8 in the carbonaceous clay.
Late BLK Somayajulu of BARC screend the samples , only two, and informed me that the samples carried 0.0098 % of U3O8. The fee for analysis was paid off by the univ of Kerala.
It happened in 1969 last quarter.
The waters that flowed over the carclay carried the radon from the radio active mineral.
In fact, the old schmo,ok geologists would recall similar reports of u3o8 from sedimentary organic rich clays from various parts of the world including that of the Neyveli tertiary sediments.