This study represents the first systematic measurement of environmental radiation in the University City of the Universidad Nacional Mayor de San Marcos (UNMSM) and the National Institute of Neoplastic Diseases (INEN) in the city of Lima, Peru, conducted between July, December 2022, and January 2023. Natural radioactivity levels and absorbed dose rates in soil samples were determined by using gamma spectroscopy with a high purity germanium detector (HPGe) semiconductor detector with 150 % efficiency. At UNMSM, the following results were obtained for the activity concentrations (A) of the four main naturally occurring radioactive materials NORM (238U, 226Ra, 232Th, and 40K): AU238 = 24.2 ± 3.4 Bq kg− 1, ARa226 = 28.8 ± 0.7 Bq kg− 1, ATh232 = 39.4 ± 1.2 Bq kg− 1 and AK40 = 539 ± 7 Bq kg− 1. We find the absorbed dose rate of 57.5 nGy h− 1 and an annual effective dose equivalen...

This study represents the first systematic measurement of environmental radiation in the University City of the Universidad Nacional Mayor de San Marcos (UNMSM) and the National Institute of Neoplastic Diseases (INEN) in the city of Lima, Peru, conducted between July, December 2022, and January 2023. Natural radioactivity levels and absorbed dose rates in soil samples were determined by using gamma spectroscopy with a high purity germanium detector (HPGe) semiconductor detector with 150 % efficiency. At UNMSM, the following results were obtained for the activity concentrations (A) of the four main naturally occurring radioactive materials NORM (238U, 226Ra, 232Th, and 40K): AU238 = 24.2 ± 3.4 Bq kg 1, ARa226 = 28.8 ± 0.7 Bq kg 1, ATh232 = 39.4 ± 1.2 Bq kg 1 and AK40 = 539 ± 7 Bq kg 1. We find the absorbed dose rate of 57.5 nGy h 1 and an annual effective dose equivalent of 0.28 mSv y...