Home » Public Awareness » General Information to Public»
Public Awareness  
Management of nuclear / radiation disasterFrequentaly Asked Questions (FAQ)
Frequently Asked Questions : Radiation Exposure & Effects


What is the cumulative effective dose (dose rate in Sv) for permanent sterility on testis?

The effective dose for acute exposure (whole body/gonadal exposure(testis)) likely to cause permanent sterility is ³ 6 Sv. Cumulative dose required may be even more since it will involve fractionated or chronic exposure as the case may be. Permanent sterility will occur if this dose to both testis is delivered in < 1 day.


What is the cumulative effective dose for permanent sterility on male sexual impotency?

There are several reasons for sexual impotency. These include diabetes, hypertension, drugs, smoking, chronic alcoholism, varied psychological factors, injury to spinal cord etc. Impotence refers only to sexual performance and not infertility. Causes such as vasculitis and vascular insufficiency in any form on permanent basis would require radiation exposure of the order of 15 Sv or above.


List the names of casual labours who has been overexposed to Nuclear Radiation

No case of Casual Labourer have been reported to have been over exposed.


List the names of contractors companies who are assigned to Radiation job/work.  

No contractors are employed in radiation work.


What is the cumulative effective dose for permanent sterility on eyes?

There is no such thing as permanent sterility of eyes. Acute gamma ray exposure in the region of 2.5 to 4 Gy may induce lenticular opacity (cataract).


Whether chances of blood cancer are likely to overexposed persons later in life and if “yes” what are the precautions to be taken to cure the diagnosis?

As per the scientific information available in literature the induction period for blood cancer following radiation exposure is 2 to 7 years. This is purely a probabilistic phenomenon. The probability of induction of blood cancer of any type depends on dose received. An acute dose of 1 Gy (1000 mGy) may cause an increase of 4% in incidence of cancer in occupational workers in their life time over and above natural occurrence of cancer (all types of cancer).


Which part of the body is most likely to be effected on overexposure by a highly radioactive source on wholebody mention the organ.

It is the bone marrow and the process of hematopoiesis (formation of various cell types in the blood).


Whether any worker/Labour/Employee has died due to highly overexposure of nuclear radiation in BARC.

No person working in BARC has died to overexposure of Nuclear radiation.


What about Health Hazards for Radiation workers? Who are overexposed to nuclear radiation, and radioactive isotopes.

Health hazards to radiation workers (occupational) have been extensively documented in the reports of the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). These are available on the website http.//unscear.org. There are also strict radiation protection and surveillance programmes instituted at various units in DAE. These follow the directions of National Regulatory Board (AERB) which are consistent with international radiation protection standards laid down by International Commission on Radiological Protection.


Whether any annual medical check up of staff was held? What are the findings of such medical check up?

Periodical medical check-up is conducted in BARC Hospital for all categories of employees, who work in different areas, like laboratories, service sectors, construction, maintenance, administration, security etc. During the period from 01.09.2009 to 31.08.2010, 3219 persons’ have undergone the health check-up and some of the employees were found to have the following health problems:

  1. 95 persons with respiratory problems
  2. 6 persons with liver related illness
  3. No case of illness due various forms of radiation exposure