(Reprinted from the Federal Register of September 26, 1961, as corrected]
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exposure with respect to the RPG. For
this purpose, the total dally intake of
such materials, averaged over Periods of
the order of a year, constitutes an appropriate criterion.
The contro! of the intake by members
of the genera] population of radioactive
materials from the environment can appropriately involve many different kinds
of actions. The character and import of
these actions may vary widely, from those
which entall little interference with
usual activities, such as monitoring and
surveillance, to those which involve u«
Tam T—Onapen Ocates oF Acrion
Ranges of transient
Fates of daily intake
Graded scale of action
Range I...wee) Periodic
confirmatory
veillance as necessary.
Range IT_._....-.... Quantitative survel
Foutine control.
rt is recommended that:
3. (a) The following guidance on daily
| intake be adopted for norma) peacetime
operations to be applied to the averace
of suitable samples of an exposed popusur- lation group:
ond
Range TI __........[ Evaluation and application ef
addivana) con
Becessary.
.
measures af
Taarz IT]—Rawers or Transtorr Rates o7 Intare
(wrcnoscaocimuzs Pee Dav} von Ust m Gaaved
SCALE OF ACTIONS Brum aRrrey In TaRLe IL
Roadiopucides
Rapre li
Range TI
Range Il -
Radium-2M........-
o-2
+d
ax0
10
K-00
We },an
Recommendations on J2a-226, I-131, Jodine-131 !....-.
oD
beyi
202 0
major disruption, such as condemnation
Sr-90, and Sr-89. The Council has given Suontium-W....
Strantium-8¥....ORO
2-2,000
200-00
of food supplies. Some contro) actions Specific consideration to the effects on
may require projonged lead times before man of rates of intake of radium-226,
} 2p the case of fodine-131, the suitable samj-le wou!d
ing effective, e.g., major changes fodine-131, strontium-90 and strontium- - feclude
only small children. For adutts, the PG for
in processing facilities or water supplies. 89 resulting in radiation doses equal to the thyroid would pot be excerded by rates of intake
The magnitude of control measures those specified in the appropriate RPG's. higherby @ factor of 30 than those applicable to smal)
should be related to the degree of likeli- ' The Council has also reviewed past and
(b) Federal agencies determine conhood that the RPG maybe exceeded. current activities resulting in the release
The use of a single numerica) intake of these radionuclides to the environment centrations of these radionuciiaes in ar,
value, which in part has been the practice and has given consideration to future water, or items of food applicable tc
wntil now, does not in many instances developments. For each of the nuclides their particular programs whicr. are conprovide adequate guidance for taking three ranges of transient daily intake are sistent with the guidance contained
actions appropriate to the risk involved. given which correspond to the guidance herein on average daily intake for the
For planning purposes, it is desirable contained in Recommendation 2, above. radionuclides radium-226, jodinc-131,
that insofar as possible contro) actions Routine control of useful applications of strontium-90, and strontium-89. Some
"to meet contingencies be known tn _ Yadiation and atomic energy should be of the genera) considerations involved in
sadvance.
such that eapected average exposures of the derivation of concentration values
It is recommended that:
suitable ramples of an exposed popula- from intak«:values are given in Stafl Re2. The radiologica) health activities of tion group will not exceed the upper port No. 2.
It is recommended that:
.
Federal agencies in connection with en- value of Range I. For iodine-131 and_
4. For radionuclides not considered in
vironmental, contamination with rauwo- radium-22., this value corresponds to
active materials be based, within the the RPG for the average of a suitable this report, agencies use concentration
limits of the agency's statutory respon- sample of an exposed population group. values in alr, water, or items of food
sibilities, on a graded series of appropri- In the cases of strontium-90 and stron- which are consistent with recommended
ate actions related to ranges of intake of tium-89, the Counci)’s study indicated Radiation Protection Guides and the
. Fadioactive materials by exposed popu- ‘that there is currently no known opera- general guidance on intake.
In the future, the Council wil] direct
tional requirement for an intake value
. lgation groups.
In order to provide guidance tn the a: high as the one corresponding the attention to the development of approagencies in adapting the gi.ded asyp- -gorG. Heuce, a value estimated to cor- priate radiation protection guidance icr
proach to their own programs, tne respond to doses to the critical organ not those radionuclides for which such con_ recommendations pertaining to the greater than one-third of the RPG has sideration appears appropriate or necessary. In particular, the Counc!) will
specific radionuclides in this memoran- been used.
study any radionuclides for which use“ dum consider three transient daily rates.
The guidance recommended below is ful applications of radiation or atomic
* of intake by suitable samples of exposed
population groups. For the other radio- given in terms of transient rates of energy require release to the environment
* muclides, the agencies can use the same | (radioactivity) intake in micromicrocu- of significant amounts of these nuclides.
-general approach, the details-of which - ties per day, The upper limit of Range ’ Federal agencies are urged to inform
are considered in Staff Report No. 2.
TT is based on an annual RPG (or lower, the Council of such situations.
The general types of action appropriate in case of radioactive strontium) considABRAHAM RiBicorr,
-when these transient rates of intake fal: ered as a1) acceptable risk for a lifetime.
* Chairman,
into the different ranges are also dis- However, it is necessary to use averages
Federal Radiation Council.
cussed in 8taff Report No. 2. The pur- over periods much shorter than a lifeThe recommendations numbered “1”
pose of these actions is to provide reason- time for both radiation dose rates and
- able assurance that average rates of Tates of. intake for administrative and through “4” contained in the above
- intake by a suitable samp’: + anew ---3 t=:ulatorv nurposes. It is recommended memorandum are approved for the guidance of Federai agencies, and the memopopulation group, ave...
tuar such --criods should be of the order
sample and averaged ove: perio’ 2 ion ofone year. It ts to be noted that values randum shall be published in the Froof the order of one year, do not exceed sted tn the tables are much smaller ERAL REGISTER. ,
Joun F. Kennepy.
the upper value of Range II. The een- than any single intake from which an
eral character of these actions is sug- individual might be expected to sustain
SEPTEMBER 207 1961.
gested in the following table.
dinfury,
.
DOE ARCHIVES
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