[ RadSafe ] Question about 10 CFR 30-15

[Cary Renquist]

Those exemptions were proposed in 1968 and finalized in 1969: (H3 in 1969; Pm147 in 1967)
The exemption for 147Pm in spark gap tubes was proposed on February 7, 1967 (32 FR 2575),
and issued as a final rule on April 26, 1967 (32 FR 6433), but the limit on the absorbed dose at
that time was 0.005 mGy/h (0.5 mrad/h). Except for 3H in microwave receiver protector tubes,
all of the other present exemptions for electron tubes, including the current limit on absorbed
dose of 0.01 mGy/h (1 mrad/h), were proposed on November 14, 1968 (33 FR 16602), and
issued as a final rule on April 18, 1969 (34 FR 6651). The exemption for 3H in microwave
receiver protector tubes was proposed on December 25, 1969 (34 FR 20276), and issued as a
final rule on June 6, 1970 (35 FR 8820).

Nureg-1717 (Radiological Assessment of Exemptions) has a lot of history on the US NRC exemptions
https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1717/

Best regards,
Cary


-----Original Message-----
From: RadSafe <radsafe-bounces at health.phys.iit.edu> On Behalf Of BRISSON Nicolas
Sent: Friday, September 21, 2018 8:56 AM
To: The International Radiation Protection (Health Physics) MailingList <radsafe at health.phys.iit.edu>
Subject: [ RadSafe ] Question about 10 CFR 30-15

Hi all,

I recently had to characterize an electron tube coming from the US, manufacturer unknown.
I only had one info : Cs-137 activity < 5 microCi.
I know it’s the exemption limit given by 10-CFR 30-15.

My question concerns the age of this regulation.
Has the limit always been the same and when has it first been implemented ?

Thanks for your help.

Nicolas Brisson
IRSN

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