[en] During neutron irradiation, some TL phosphors were activated. After leaving the irradiation field the TL phosphor produced self-irradiation. The TL output of self-dose was only related to the original neutron fluence and independent of the γ-radiation. Several CaSO₄ TL phosphors were made. They were CaSO₄:Dy, CaSO₄:Dy-Teflon, CaSO₄:Dy mixed with Dy₂O₃, CaSO₄:Mn mixed with Dy₂O₃. The linearity, and lower detection limits of these TL phosphors were measured. The thermal neutron response of CaSO₄:Mn mixed with Dy₂O₃ was 64 R/(10¹⁰cm^-2) and the lower detection limit was 1.3x10⁵cm^-2

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[en] The neutron spectra around the HWRR (Heavy Water Research Reactor) of the Institute of Atomic Energy of China were measured. For the neutron spectra at different measuring points, the mean neutron energies ranged from 11 to 201 keV, the maximum energies were below 5 MeV, the effective quality factors were between 2.5 and 5, and the fast neutron dose equivalents mostly contributed the large fraction. During normal operation of the reactor, the n-γ dose equivalent rates in working areas were measured as well. In the experimental hall and the basement of the reactor, the mean values of the n/γ dose equivalent ratios were 15% and 31%, respectively; the γ dose equivalents were predominant. The annual dose equivalents to the persons working in the areas mentioned above possibly exceed the dose equivalent limit

[en] This paper describes the indoor absorbed dose rate in air in Beijing. The average indoor absorbed dose rate in air is 8.29 μrad/h. The ratio of indoor to outdoor absorbed dose rate for 849 buildings is 1.51