“…given for counting tritium activity in tritiated triolein and for determining naphthalene in tar oil fractions by the isotope-dilution method using naphthalene tagged with carbon-1 4. Liquid scintillation counting (1,4,7) is recognized as being advantageous for counting low-energy beta rays of radioisotopes such as carbon-14, tritium, and sulfur-35. It is also advantageous for relatively volatile substances such as naphthalene.…”