Development Of Thermoluminescence Neutron Personal Dosemeter For Broad Spectrum

Neutron personal dose equivalent was overestimated in the low-energy range butunderestimated in the high-energy range for albedo neutron thermoluminescencedosemeter（TLD）. And there isn’t a convenient and simple method to evaluate neutronpersonal dose equivalent reasonably in stray neutron field so far. The research purpose of thispaper is to optimize the parameter based on the TLD designed by our team and to proposetwo methods for evaluating neutron personal dose reasonably.The energy responses of the particles were calculated by MCNP. The particles includemonoenergetic neutron with the energy range from thermal to20MeV, photon with the energyrange from10keV to10MeV and approximately150groups of broad neutron spectrum fromthe IAEA of Technical Reports Series No.318and No.403. In order to get the neutronpersonal dose, two methods of field calibration factor and few-channel unfolding were usedfor evaluating neutron personal dose.The results based on the field calibration factor method shown that the deviations of thepersonal dose equivalent were within±70%in monoenergetic neutron field and the deviationsof the stray neutron field were less than six times, respectively.The results of the few-channel unfolding method indicated that the deviations of personaldose equivalent were from-23%to41%and the deviations of the neutron mean energy wereless than ten times in monoenergtic neutron field, respectively. The deviations of the personaldose equivalent were from-55%to72%and the deviations of the neutron mean energy werefrom-94%to81%in broad neutron spectrum, respectively.The TLD was calibrated with¹³⁷Cs γ source and reference neutron radiation²⁴¹Am-Besource. Two monoenergetic neutron fields of2.5MeV and14.8MeV were selected for theverification test. The experimental results show that the deviations of the neutron personaldose equivalent were less than±100%by means of the field calibration method and werewithin±30%by means of the few-channel unfolding method, respectively.