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The specific activities of  226 Ra,  232 Th and  40 K of seven different color classification of nephrite samples from Xinjiang of China were measured by gamma spectrometry, and their radiological hazard indices such as radium equivalent ( Raeq ), external hazard index ( H ex), internal hazard index ( Hin ), alpha index ( Iα ), absorbed dose rate ( D ) and annual effective dose rate ( AED ) were investigated and assessed. According to the experimental results, the specific activity level of  226 Ra,  232 Th,  40 K in all nephrite samples was between 13.56 and 116.39 Bq·kg −1  with an average of 44.72 Bq·kg −1 , between 2.19 and 10.89 Bq·kg −1  with an average of 4.90 Bq·kg −1 , and between 21.06 and 94.32 Bq·kg −1  with an average of 52.24 Bq·kg −1 , respectively. The mean values of radiological indicators, such as  Raeq ,  H ex,  Hin ,  Iα  and  AED  were 55.75 Bq·kg −1 , 0.15, 0.27, 0.22, 0.16 mSv·y -1  (worn) and 0.13 mSv·y −1  (indoor), respectively, are lower than the international recommended value. The values of  D  range from 10.13 to 54.46 nGy·h −1  with an average of 25.80 nGy·h −1 . In the end, it can be concluded that the use of the seven different color categories of nephrites as ornament is considered to be safe and unlikely to cause any significant biological radiation hazard to the public.

Radiological characterization of nephrite produced in Xinjiang, Northwest China