Personal Monitoring

Anyone working with radioactive materials or with radiation emitting devices must be monitored for radiation exposure. Grand Valley most often uses Dosimeter badges to monitor occupational exposure. Dosimeters contain material that is sensitive to radiation and allowing the monitoring of exposure. Monitoring will not be used on persons who are exposed only to low energy beta radiation such as 3H, 14C, 35S, 45Ca, and 63Ni. The Radiation Safety Committee may require monitoring to be conducted on other individuals at their discretion. GVSU will manage its dosimetry program as follows.

Radiation Rings

  1. Personal dosimeters are supplied to Authorized Users on a monthly or quarterly basis and must be used at all times when working with ionizing radiation.
  2. Individuals are responsible for keeping track of their own dosimeters and returning them at the end of the monitoring period.
  3. It is typically the responsibility of the RSO to cover costs associated with monitoring of NRC Licensed user. Dosimitry for X-ray medical devices will be managed by the academic department utilizing the equipment.
  4. Personal dosimeters are assigned to one individual and are not to be used by any other individual during the monitoring period. Authorized users are responsible for ensuring dosimeters are used by the appropriate individual and are worn properly.
  5. A badge will be issued if it is likely that the body may be exposed fairly uniformly. Badges should be worn on chest, collar, or belt so as to indicate "whole body" exposure. If a lead apron is worn the badge should be worn at collar level outside the apron so that exposure to the head is monitored.
  6. Ring badges should be issued in non-uniform radiation fields where an extremity may receive a significant exposure. They should be worn on the palm side of the hand to best monitor the exposure received from handling radionuclides. If wearing gloves to prevent contamination to the hands, the ring badge should be worn under the gloves.
  7. Control badges are used to determine the background radiation levels which is subtracted from the individuals exposure to determine the occupational dose received. The control badge must not be exposed to any source of radiation.
  8. If a dosimeter is lost or damaged, the RSO should be notified immediately so that a temporary replacement dosimeter can be issued.
  9. Records will be received, reviewed and maintained by the RSO or other departmental authorized individuals. Unless posting of results is required, results will be available electronically and provided upon request of individuals tested. Each monitored individual should maintain records from their own entire occupational history of exposure to ionizing radiation. Monitoring records will be kept by GVSU indefinitely.

 

Table 1: Allowable Annual Occupational Dose Limits

Description

Dose Limit (Rem)

Whole Body

5

Skin and Extremities

50

Lens of Eyes

15

Minors

10% of above

Pregnant Workers

0.5