Open AccessEVALUATION OF CARCINOGENIC RISK OF GRANITE SAMPLES FROM SELECTED QUARRIES IN ONDO AND EKITI STATES, NIGERIA
Author(s) -
Adeniyi Akinrinbola Ebenezer
Publication year - 2019
Publication title -
international journal of engineering applied science and technology
Language(s) - English
Resource type - Journals
ISSN - 2455-2143
DOI - 10.33564/ijeast.2019.v04i03.036
Subject(s) - environmental science , mining engineering , geology
A total of twenty granite rock samples were collected from twenty quarry locations in Ondo and Ekiti States. Activity concentration measurement was done using Hyper Pure Germanium detector. The mean activity concentration is 21.01±3.15 Bq kg -1 for samples in 238 U, 51.19±6.73 Bq kg -1 in 232 Th, and 489.11±73.37 Bq kg -1 in 40 K. The mean absorbed dose rate in air is 57.21 nGy h -1 , the mean internal level index is 0.11 while the maximum permissible level for the four is unity and the mean excess lifetime cancer risk is 0.74 x 10 -3 . The probability of sample from selected quarries causing carcinogenic risk on the buildings they are constructed with is very low. KEYWORD – Activity, Detector, Germanium, Hyperpure, Gonnadal