Abstract. Comparisons of the air kerma standards of six national laboratories, carried out in ¹³⁷Cs gamma radiation, show an overall agreement of 0,8 % between the standards. This result is not quite as good as that of comparisons in ⁶⁰Co gamma radiation, mainly because the evaluation of the ionization-chamber wall correction is less accurate for ¹³⁷Cs radiation. However, this agreement is acceptable for radio-protection applications.

Print publication: Issue 2 (April 1997)