Measurement of the Wear of a Blast Furnace Brickwork with a Radioactive Isotope (II)

Abstract

Following the foundamental exgeriment, which was reported previously, on a test method using a radioisotope for measuring wear of the blast furnace brickwork during its operation, 22 specimens containing Co⁶⁰ were buried in the brickwork of Kamaishi No. 1 B. F. which was reconstructed from Aug. to Nov. 1958. The buried positions were 11 in 4 levels and two specimens which trisected the brickwork were buried on each position. Measurements were done once a week on the mantle of these positions with a portable scintillation counter. As the average radioactivity of Co⁶⁰ buried was about 0·5mc., there was no problem about safety.
The wearing state had been measured since Nov. 18, 1958, when the No. 1 B.F. was blown in, and on the bosh level the two buried specimens were dropped within only 4 weeks.