Dose equivalents

Xem 1-6 trên 6 kết quả Dose equivalents
  • The NCRP has long recognized the need for a clear assessment of the magnitude of doses from various sources of radiation to which the population of the U.S. is exposed. In anticipation of the need to gather data for input into this process, five assessment committees, each addressing a different source category, were established. NCRP reports assessing exposures from natural background, consumer products, nuclear power generation, and diagnostic medical radiation have been published (NCRP, 1987a,b,c,d, NCRP, 1989)....

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  • To determine the effect of different doses of: – ADIMIX C (0, 500, 1000 g/ton ) – ADIMIX 30 COATED 1500 g/ton in the prestarter and starter – Prestarter contained 5 kg/ton Ultracid Lac Plus Dry. – Starter contained 3 kg/ton Ultracid Lac Plus Dry. • To determine the equivalence of ADIMIX Coated 30% to ADIMIX C • To determine the optimal dose in the prestarter/starter phases

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: Stereotactic body radiation therapy for melanoma and renal cell carcinoma: impact of single fraction equivalent dose on local control...

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  • In 1948, the General Conference on Weights and Measures (Confkrence Ginirale des Poids et Mesures, CGPM), a diplomatic conference responsible for the "international unification and development of the metric system," instructed its International Committee for Weights and Measures to develop a set of rules for the units of measurement. The "International System of Unitsn (SI) was developed under this charge, adopted by the CGPM in 1960, and accepted by all signatories to the Meter Convention in 1977...

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  • The activity concentrations of the natural radionuclides 226Ra, 232Th and 40K in soil samples were measured by a gamma spectrometer with a HPGe detector. The average activity concentrations of the natural radionuclides 226Ra, 232Th and 40K are 43.8 ± 5.6, 57.0 ± 7.3 and 426.4 ± 23.1, respectively. The average activity concentrations of 226Ra and 232Th in this work are higher than those of the world average values.

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  • Từ đó có khái niệm liều t−ơng đ−ơng (Equivalent dose). Liều t−ơng đ−ơng l tích số của liều hấp thụ với yếu tố chất l−ợng tia. Trong hệ SI, liều t−ơng đ−ơng đ−ợc tính bằng J/ kg hay còn gọi l Sievert (Sv). Bức xạ Alpha (α): có tác dụng phá huỷ mạnh, ít đ−ợc dùng trong lâm s ng. Các loại đvpx nhân tạo thông dụng đều không phát tia Alpha.

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