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γ射线曝光计算尺是在γ射线探伤时用来计算曝光时间的计算尺.一曝光量计算公式用于射线探伤的γ源可视为点源,计算点源辐射场强度可用下式表示:N_0=А·Г/R_0~2(R/h) (1)式中:N_0——离源 R_0厘米处的照射率;Г——照射率常数,它表示距离1毫居里(3.7×10~7贝柯勒尔)点状γ源1cm 处产生的以伦琴/小时(R/h)为单位的照射率;A——源强,mCi;R_0——离源之距离,cm.射线探伤时,考虑散射射线的影响,则可视为宽束γ射线在物质中的减弱。宽束γ射线在物质中的减弱可用下式表示:
The γ-ray exposure slide rule is a slide rule used to calculate the exposure time during the γ-ray flaw detection. An Exposure Calculation Formula The γ source used for ray flaw detection can be regarded as a point source. The intensity of a point source radiation field can be expressed as follows: N_0 = А · Г / R_0 ~ 2 (R / h) (1) where: N_0 - the rate of radiation at R_0 cm from the source; Γ - the rate constant of the radiation, which represents a distance of 1 millitorre (3.7 × 10 ~ 7 Bakeller) Irradiance at Rcm / hour (R / h) at 1 cm from a point-like gamma source A - source intensity, mCi; R_0 - distance from the source, cm , Consider the impact of scattered radiation, it can be considered as wide beam γ-ray attenuation in matter. Wide beam γ-ray attenuation in matter can be expressed as follows: