Several nuclear emulsion plates have been triple scanned for nuclear interaction stars. Triple scanning showed that stars of different types had nearly similar intrinsic probabilities of being detected applying the Tolstov test. However, the estimated number of stars using the double scanning method of Lim et al. and the average value from triple scanning suggested by Tolstov were below the total number of stars found by the three scannings n 1+2+3. A method was suggested to classify the stars into two groups each of different intrinsic probability. With this classification and with the consideration of the effect of the positions of stars in their fields of view on their efficiencies, the double scanning method was found to an estimated total number above n 1+2+3.