The spectrum-dose conversion operators (hereafter,
G(
E) function) were calculated for CsI(Tl) scintillation counters based on the response functions obtained by a Monte Carlo simulation code, MCNP5, in the photon energy range from 40 to 10,000 keV. The
G(
E) functions were determined in the cases of crystal sizes 5.5 × 5.5 × 5.5, 10 × 10 × 10, 13 × 13 × 20 and 38 × 38 × 25 mm
3 for ambient dose,
H*(10). It was found that the values of
H*(10) deduced from the pulse-height spectra and the
G(
E) function agreed with those of
H*(10) evaluated in the calibration field in Japan Atomic Energy Agency (JAEA) within 2% in the case of irradiations by
137Cs,
226Ra and
60Co source, by the measurements using a scintillation counter whose crystal size was 13 × 13 × 20 mm
3.
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