legal dose limits that an
employee should not exceed in a calendar year.
ISU establishes more conservative values than allowed by Federal and
State authorities and the ALARA goals
in the next section) are set and self imposed by the ISU Radiation
Safety Committee in
to minimize personnel exposure.
Idaho State University's
Dose Limits (legal limits set by ISU) are
The annual adult
is the more limited of:
administrative occupational dose limits
are far less
than the occupational dose limits set by the NRC or the State of Idaho.
equal to 2,000 mrem (2 rem); or
sum of the
equivalent and the
committed dose equivalent to any individual organ or tissue, being
equal to 10,000 mrem (10
The ALARA goals
here as a
comparison to the legal limits. The ALARA concept is
the next section.
Dose Limits (applies
to radioactive materials users)
- 300 mrem/calendar
quarter (notification level)
The annual adult
age or older) occupational dose limit established by the United States
Nuclear Regulatory Commission is the more limiting of:
equal to 5,000 mrem (5 rem); or
- The sum of the deep-dose
equivalent and the committed dose equivalent to any
individual organ or tissue other than the lens of the eye being equal
to 50,000 mrem (50 rem).
eye dose equivalent
15,000 mrem (15
of 50,000 mrem (50
rem) to the skin or to each of the extremities.
Limits (applies to X-ray and accelerator users only)
Public Dose Limits
body; head and
trunk; active blood-forming
organs; lens of eye or gonads 1,250 mrem/cal qtr
and ankles 18,750
of whole body
The dose limit
for members of
public, including all persons who are not classified as radiation
is a total effective dose equivalent not to exceed 100 mrem per
In addition, the dose in any unrestricted area from external sources
exceed 2 mrem in any one hour.
may be more
to radiation effects than an adult and is, therefore, subject to a
dose limit. The dose limit for the embryo-fetus is 500 mrem
during the entire gestation period. As a further precaution,
limit should not be experienced in an acute fashion, but rather
distributed relatively uniformly during the gestation period if it is
to be experienced (Regulatory
Guide 8.13). This degree of protection for the embryo-fetus
be achieved with the cooperation of the employee. It is recommended
that she notifies her
supervisor or the RSO as soon as the pregnancy is known. In
a pregnant worker to take advantage of the lower exposure limit and
monitoring provisions, the woman may declare
pregnancy in writing to the TSO. A form letter
from TSO or by clicking here.
This notification is optional, and at the discretion of the employee
the TSO encourages the act of notification, when appropriate. Unless
a woman declares her pregnancy, ISU can not set special dose equivalent
Limits for Minors
The dose limits
18 years of age) are 10% of the adult occupational dose limits.