Photoneutron spectrum estimation and its experimental validation using neutron REM (Roentgen Equivalent in Man) detector

► The photoneutron spectrum from the beryllium target of thickness 2 cm and 9 cm diameter is estimated using MCNP code. ► The NCRP-38 flux to dose conversion factors has been used for neutron dose calculation. ► The calculated neutron dose at 42 cm from the source is 5.29E−04 ± 5.9% Sv/h. ► The experimentally measured neutron dose using the Neutron rem detector is 5.52E−04 ± 3.9% Sv/h.