“…The XRF methods developed in our laboratory (Chandola et al 1976ab, Chandola and Mohile 1977and Dixit and Deshpande 1975, 1977a,b, 1978Dixit and Kapoor 1980) use fixed time counting (maximum 100 sec) and reproducible double-layer pellet method for sample preparation and therefore have better precision, lower estimation limit with adequate accuracy.…”