A comparison of fission track and K-Ar ages for a set of mineral age standards has been used to evaluate the 238U spontaneous fission decay constant, 238λf. Neutron doses were monitored with two fission-track glasses calibrated against a series of Co wire neutron flux monitors in an irradiation facility with a uniform flux distribution in the Herald reactor. An interlaboratory comparison shows that these calibrations compare closely with standard dose measurements made at the U.S. National Bureau of Standards. A value of (7·±0·28) × 10-17 yr-1 was obtained for 238λf.
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