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Environment & Health

Question
21 out of 72
 

Proposed guideline values for radioactivity in drinking water is:



A Gross α activity 0.5 Bq/L & gross β activity 1Bq/L

B Gross α activity 1 Bq/L & gross β activity 0.1Bq/L

C Gross α activity 1 Bq/L & gross β activity 10 Bq/L

D Gross α activity 10 Bq/L & gross β activity 1Bq/L

Ans. A Gross αactivity 0.5 Bq/L & gross βactivity 1Bq/L Ref: Park; 22nd edi, pg –691,754
  1. Radioactivity in drinking water should not only be kept within safe limits; it should also, within those limits, be kept as low as is reasonably possible. The guideline values recommended take account of both naturally occurring radioactivity and any radioactivity that may reach the water source as a result of man's activities. From a radiological point of view, they represent a value below which water can be considered potable without any further radiological examination.
  2. The activity of a radioactive material is the number of nuclear disintegration per unit of time. The unit of activity is a becquerel (Bq); 1 Bq = 1 disintegration per second. Formerly, the unit of activity was curie (Ci).
  3. The proposed guideline values are: gross alpha activity 0.5 Bq / L gross beta activity 1.0 Bq / L

Environment & Health Flashcard List

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