[en] Based on neutron Q-bar Values recommended by ICRP report 60 and the unified dose conversion functions given by Wagner et al., the ambient dose equivalent coefficients of reference neutron radiations are computed, and the relative issues are also discussed

[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

[en] The development on the concept of neutron quality factor and dose equivalent is briefly introduced. An empirical formula on effective neutron quality factors recommended by the ICRP report 60 is given. The fluence to ambient dose equivalent conversion coefficients for some monoenergic neutrons are given as well

[en] Highlights: • The nanostructured Zr films deposited on Al₂O₃ substrate are obtained by pulsed laser deposition (PLD) for the application of first mirror. • The Zr films showed a very smooth surface and low values of root mean square roughness (RMS). • The high reflectivities make it one of great candidate of first mirror materials for the applications of nuclear fusion. - Abstract: The nanostructured zirconium (Zr) films deposited on Al₂O₃ substrate are obtained by pulsed laser deposition (PLD) for the application of first mirror. Structural features, optical properties and surface morphologies of as-grown Zr films are systematically investigated as a function of pulse repetition rate. It is found that the Zr films show a typical hexagonal close packed structure and all deposited films exhibit a very smooth surface. There are no voids and folds on the surface of Zr films. The root mean square roughness (RMS) values increase with increasing pulse repetition rate. The variation of pulse repetition rate has no obvious effects on the reflectivity because of the smooth film surface. Up to the wavelength of 800 nm, the reflectivity is higher than 70%, which is excellent for the application of first mirror

[en] The checking computation and interpolation for conversion coefficient of photon ambient dose equivalent recommended by ICRU report 47 are given, and the suitable interpolation is put forward

No abstract available

[en] The shielding neutron efficiency of boron-bearing materials developed recently is introduced. The thermal neutron shield ratio for two kinds of non-waving cloth with thickness of 58 mg/cm² and 153 mg/cm² is 51% and 79%. Their mass attenuation coefficient for 0.186, 24.4 and 144 keV neutron is 1.56, 1.29 and 0.9 cm²/g separately. For the neutral boron-bearing transparent resin plate with the thickness of 0.59 g/cm², the thermal neutron shield ratio is 85% and for enriched boron or gadolinium-bearing resin plate is 97%. The shield ratios of all three materials for 24.4 keV neutrons are 38%. The transparence of natural light for enriched boron-bearing resin plates is no considerable change after they were exposed to thermal neutrons up to 6 Sv. After they were exposed up to 20 Sv, the transparence reduces to 50% but the thermal neutron shield ratio does not change. The gadolinium-bearing plate has a very strong thermal neutron-capture gamma radiation and its dose-equivalent is greater than the dose-equivalent of incident thermal neutrons

[en] We have developed two kinds of portable monitoring devices to measure the concentration and potential energy concentration of radon and its progeny in air. The thermoluminescence material CaSO4 (Tm) is used as the detection element. One of the devices is called passive radon monitor. The lowest detectable limit for radon in air is about 1.5 Bq/m³, as a sampling time being one week. Good reliability and ease to operate are its main advantages. The second kind of device is called a working level monitor which consists of a miniature remembrane pump and an integrating sampling probe. The lowest detectable limit is about 0.00043 WL (9x10^-9J/m³) for a sampling time of 6 hours. It weighs only 0.35 kg, but maintenance is necessary sometimes. (author). 6 refs, 2 figs, 4 tabs

[en] Two kinds of portable monitors have been developed, which can be used to measure the concentration of radon or potential energy concentration of radon or potential energy concentration of radon progenies in air. The thermoluminescent material CaSO₄(Tm) is used as a detecting element for both of them. The lowest detectable limit of the passive radon monitor is about 1.5 Bq/m³ for radon in air, as the exposure time being one week. Its main advantages are high reliability and convenient manipulation. The working level monitor for radon progenies in air consists of a mini membrane pump and an integrating probe. The lowest detectable limit is about 6.2 x 10^-9 J/m³, as the sampling time being 6 hours. It weights only about 0.35 kg

[en] The energy response and directionality of neutron survey meter type MK7 and 2202D are determined. The reactor thermal column beam, reactor filtered beams (6 eV, 24.4 keV and 144 keV), ²²⁶Ra-Be, ²⁴¹Am-Be, ²⁵²Cf and its moderated sources are used for the measurement. The results shows: the survey meters are influenced obviously by the direction; the response of middle-energy region is large, the energy response of 2202D is better than MK7