[ RadSafe ] IAEA Dose limits

[Sandy Perle]

Schedule II

DOSE LIMITS

APPLICATION
II-1. The dose limits specified in Schedule II apply to exposures
attributable to
practices, with the exceptions of medical exposures and of exposures from
natural
sources that cannot reasonably be regarded as being under the responsibility
of any
principal party of the Standards.
II-2. Subject to the requirements set forth in para. 205 for exposure in a
workplace
to radon above a yearly average concentration of 1000 Bq-irT3 37 in air, the
dose
limits for occupational exposure and the relevant requirements of Appendix I
shall
apply.
II-3. The dose limits are not relevant for the control of potential
exposures.
II-4. The dose limits are not relevant for decisions on whether and how to
undertake
an intervention, but workers undertaking an intervention shall be subject to
the
relevant requirements of Appendix V.
OCCUPATIONAL EXPOSURE
Dose limits
II-5. The occupational exposure of any worker shall be so controlled that
the
following limits be not exceeded:
(a) an effective dose of 20 mSv per year averaged over five consecutive
years38;
(b) an effective dose of 50 mSv in any single year;
37 The International Commission on Radiological Protection has recommended
that
the action levels for occupational exposure to radon can fall in the range
500-1500 Bq-m~3.
(See INTERNATIONAL COMMISSION ON RADIOLOGICAL PROTECTION, Protection
against Radon-222 at Home and at Work, Publication No. 65, Ann. ICRP 23 2,
Pergamon
Press, Oxford (1993).)
38 The start of the averaging period shall be coincident with the first day
of the
relevant annual period after the date of entry into force of the Standards,
with no retroactive
averaging.
91
92 SCHEDULES
(c) an equivalent dose to the lens of the eye of 150 mSv in a year; and
(d) an equivalent dose to the extremities (hands and feet) or the skin39 of
500 mSv
in a year.
II-6. For apprentices of 16 to 18 years of age who are training for
employment
involving exposure to radiation and for students of age 16 to 18 who are
required
to use sources in the course of their studies, the occupational exposure
shall be so
controlled that the following limits be not exceeded:
(a) an effective dose of 6 mSv in a year;
(b) an equivalent dose to the lens of the eye of 50 mSv in a year; and
(c) an equivalent dose to the extremities or the skin39 of 150 mSv in a
year.
Special circumstances
II-7. When, in special circumstances40, a temporary change in the dose
limitation
requirements is approved pursuant to Appendix I:
(a) the dose averaging period mentioned in para. II-5 (a) may exceptionally
be up
to 10 consecutive years as specified by the Regulatory Authority, and the
effective
dose for any worker shall not exceed 20 mSv per year averaged over this
period and shall not exceed 50 mSv in any single year, and the circumstances
shall be reviewed when the dose accumulated by any worker since the start of
the extended averaging period reaches 100 mSv; or
(b) the temporary change in the dose limitation shall be as specified by the
Regulatory
Authority but shall not exceed 50 mSv in any year and the period of the
temporary change shall not exceed 5 years.
PUBLIC EXPOSURE
Dose limits
II-8. The estimated average doses to the relevant critical groups of members
of the
public that are attributable to practices shall not exceed the following
limits:
39 The equivalent dose limits for the skin apply to the average dose over 1
cm2 of the
most highly irradiated area of the skin. Skin dose also contributes to the
effective dose, this
contribution being the average dose to the entire skin multiplied by the
tissue weighting factor
for the skin.
40 See Appendix I: the provisions for 'alternative employment' set out in
para. 418
may be relevant.
II. DOSE LIMITS 93
(a) an effective dose of 1 mSv in a year;
(b) in special circumstances, an effective dose of up to 5 mSv in a single
year
provided that the average dose over five consecutive years does not exceed
1 mSv per year;
(c) an equivalent dose to the lens of the eye of 15 mSv in a year; and
(d) an equivalent dose to the skin of 50 mSv in a year.
Dose limitation for comforters and visitors of patients
II-9. The dose limits set out in this part shall not apply to comforters of
patients,
i.e., to individuals knowingly exposed while voluntarily helping (other than
in
their employment or occupation) in the care, support and comfort of patients
undergoing medical diagnosis or treatment, or to visitors of such patients.
However,
the dose of any such comforter or visitor of patients shall be constrained
so that
it is unlikely that his or her dose will exceed 5 mSv during the period of a
patient's
diagnostic examination or treatment. The dose to children visiting patients
who
have ingested radioactive materials should be similarly constrained to less
than
1 mSv.

----------------------------------------------------------------
Sander C. Perle 
President
Global Dosimetry Solutions, Inc. 
2652 McGaw Avenue
Irvine, CA 92614
 
Tel: (949) 296-2306 / (888) 437-1714 Extension 2306 
Fax:(949) 296-1144
 
E-Mail: sperle at dosimetry.com
E-Mail: sandyfl at cox.net 
 
Global Dosimetry Website: http://www.dosimetry.com/ 
 

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of Brian Rees
Sent: Thursday, July 19, 2007 8:06 AM
To: radsafe at radlab.nl
Subject: [ RadSafe ] IAEA Dose limits

I am unable to download IAEA safety series 115, and am looking to find out 
conclusively what the IAEA limits for occupational workers are: 20 or 50 
mSv/yr.

Thanks,
Brian Rees 

_______________________________________________
You are currently subscribed to the RadSafe mailing list

Before posting a message to RadSafe be sure to have read and understood the
RadSafe rules. These can be found at:
http://radlab.nl/radsafe/radsaferules.html

For information on how to subscribe or unsubscribe and other settings visit:
http://radlab.nl/radsafe/