**Energy Compensation Sources for Well Logging and Other Regulatory
Clarifications B Part 39**

**(65 FR 20337; April 17, 2000) RATS ID 2000‑1 Effective 5/17/00**

+-----+------+----+-------+----------------+-----+------+-----------+
| **  | *    | *  | **    | **Summary of   | **  | **S  | **If      |
| Cha | *Tit | *S | Compa | Change to      | Dif | igni | Di        |
| nge | le** | ta | tibil | CFR**          | fer | fica | fference, |
| to  |      | te | ity** |                | enc | nt** | Why or    |
| NR  |      | ** |       |                | e** |      | Why Not   |
| C** |      |    | **    |                |     | **   | Was a     |
|     |      | *  | Categ |                | *   | Yes/ | Comment   |
| **  |      | *S | ory** |                | *Ye | No** | Ge        |
| Sec |      | ec |       |                | s/N |      | nerated** |
| tio |      | ti |       |                | o** |      |           |
| n** |      | on |       |                |     |      |           |
|     |      | ** |       |                |     |      |           |
+=====+======+====+=======+================+=====+======+===========+
| \'3 | Def  |    | B     | **Added        |     |      |           |
| 9.2 | init |    |       | Definition:**  |     |      |           |
|     | ions |    |       |                |     |      |           |
|     |      |    |       | Energy         |     |      |           |
|     |      |    |       | compensation   |     |      |           |
|     |      |    |       | source (ECS)   |     |      |           |
|     |      |    |       | means a small  |     |      |           |
|     |      |    |       | sealed source, |     |      |           |
|     |      |    |       | with an        |     |      |           |
|     |      |    |       | activity not   |     |      |           |
|     |      |    |       | exceeding 3.7  |     |      |           |
|     |      |    |       | MBq \[100      |     |      |           |
|     |      |    |       | microcuries\], |     |      |           |
|     |      |    |       | used within a  |     |      |           |
|     |      |    |       | logging tool   |     |      |           |
|     |      |    |       | or other tool  |     |      |           |
|     |      |    |       | components, to |     |      |           |
|     |      |    |       | provide a      |     |      |           |
|     |      |    |       | reference      |     |      |           |
|     |      |    |       | standard to    |     |      |           |
|     |      |    |       | maintain the   |     |      |           |
|     |      |    |       | tool\'s        |     |      |           |
|     |      |    |       | calibration    |     |      |           |
|     |      |    |       | when in use.   |     |      |           |
+-----+------+----+-------+----------------+-----+------+-----------+
| \'3 | Def  |    | B     | **Added        |     |      |           |
| 9.2 | init |    |       | Definition:**  |     |      |           |
|     | ions |    |       |                |     |      |           |
|     |      |    |       | Tritium        |     |      |           |
|     |      |    |       | neutron        |     |      |           |
|     |      |    |       | generator      |     |      |           |
|     |      |    |       | target source  |     |      |           |
|     |      |    |       | means a        |     |      |           |
|     |      |    |       | tritium source |     |      |           |
|     |      |    |       | used within a  |     |      |           |
|     |      |    |       | neutron        |     |      |           |
|     |      |    |       | generator tube |     |      |           |
|     |      |    |       | to produce     |     |      |           |
|     |      |    |       | neutrons       |     |      |           |
+-----+------+----+-------+----------------+-----+------+-----------+
| \   | A    |    | C     | **Revised      |     |      |           |
| '39 | gree |    |       | Paragraphs     |     |      |           |
| .15 | ment |    |       | (a)(5)(ii)&    |     |      |           |
|     | with |    |       | intro(iii):**  |     |      |           |
|     | well |    |       |                |     |      |           |
|     | o    |    |       | (a)(5)         |     |      |           |
|     | wner |    |       |                |     |      |           |
|     | or   |    |       | \(ii\) A means |     |      |           |
|     | oper |    |       | to prevent     |     |      |           |
|     | ator |    |       | inadvertent    |     |      |           |
|     |      |    |       | intrusion on   |     |      |           |
|     |      |    |       | the source,    |     |      |           |
|     |      |    |       | unless the     |     |      |           |
|     |      |    |       | source is not  |     |      |           |
|     |      |    |       | accessible to  |     |      |           |
|     |      |    |       | any subsequent |     |      |           |
|     |      |    |       | drilling       |     |      |           |
|     |      |    |       | operations;    |     |      |           |
|     |      |    |       | and            |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(iii\) A      |     |      |           |
|     |      |    |       | permanent      |     |      |           |
|     |      |    |       | identification |     |      |           |
|     |      |    |       | plaque,        |     |      |           |
|     |      |    |       | constructed of |     |      |           |
|     |      |    |       | long lasting   |     |      |           |
|     |      |    |       | material such  |     |      |           |
|     |      |    |       | as stainless   |     |      |           |
|     |      |    |       | steel, brass,  |     |      |           |
|     |      |    |       | bronze, or     |     |      |           |
|     |      |    |       | monel, must be |     |      |           |
|     |      |    |       | mounted at the |     |      |           |
|     |      |    |       | surface of the |     |      |           |
|     |      |    |       | well, unless   |     |      |           |
|     |      |    |       | the mounting   |     |      |           |
|     |      |    |       | of the plaque  |     |      |           |
|     |      |    |       | is not         |     |      |           |
|     |      |    |       | practical. The |     |      |           |
|     |      |    |       | size of the    |     |      |           |
|     |      |    |       | plaque must be |     |      |           |
|     |      |    |       | at least 17 cm |     |      |           |
|     |      |    |       | \[7 inches\]   |     |      |           |
|     |      |    |       | square and 3   |     |      |           |
|     |      |    |       | mm             |     |      |           |
|     |      |    |       | \[1/8‑inch\]   |     |      |           |
|     |      |    |       | thick. The     |     |      |           |
|     |      |    |       | plaque must    |     |      |           |
|     |      |    |       | contain‑‑      |     |      |           |
+-----+------+----+-------+----------------+-----+------+-----------+
| \   | Leak |    | C     | **Amended      |     |      |           |
| '39 | tes  |    |       | paragraphs     |     |      |           |
| .35 | ting |    |       | (b), (c),**    |     |      |           |
|     | of   |    |       |                |     |      |           |
|     | se   |    |       | **(d)(1),      |     |      |           |
|     | aled |    |       | (e)(1), (e)(4) |     |      |           |
|     | sou  |    |       | and (e)(5):**  |     |      |           |
|     | rces |    |       |                |     |      |           |
|     |      |    |       | \(b\) Method   |     |      |           |
|     |      |    |       | of testing.    |     |      |           |
|     |      |    |       | The wipe of a  |     |      |           |
|     |      |    |       | sealed source  |     |      |           |
|     |      |    |       | must be        |     |      |           |
|     |      |    |       | performed      |     |      |           |
|     |      |    |       | using a leak   |     |      |           |
|     |      |    |       | test kit or    |     |      |           |
|     |      |    |       | method         |     |      |           |
|     |      |    |       | approved by    |     |      |           |
|     |      |    |       | the Commission |     |      |           |
|     |      |    |       | or an          |     |      |           |
|     |      |    |       | Agreement      |     |      |           |
|     |      |    |       | State. The     |     |      |           |
|     |      |    |       | wipe sample    |     |      |           |
|     |      |    |       | must be taken  |     |      |           |
|     |      |    |       | from the       |     |      |           |
|     |      |    |       | nearest        |     |      |           |
|     |      |    |       | accessible     |     |      |           |
|     |      |    |       | point to the   |     |      |           |
|     |      |    |       | sealed source  |     |      |           |
|     |      |    |       | where          |     |      |           |
|     |      |    |       | contamination  |     |      |           |
|     |      |    |       | might          |     |      |           |
|     |      |    |       | accumulate.    |     |      |           |
|     |      |    |       | The wipe       |     |      |           |
|     |      |    |       | sample must be |     |      |           |
|     |      |    |       | analyzed for   |     |      |           |
|     |      |    |       | radioactive    |     |      |           |
|     |      |    |       | contamination. |     |      |           |
|     |      |    |       | The analysis   |     |      |           |
|     |      |    |       | must be        |     |      |           |
|     |      |    |       | capable of     |     |      |           |
|     |      |    |       | detecting the  |     |      |           |
|     |      |    |       | presence -of   |     |      |           |
|     |      |    |       | 185 Bq \[0.005 |     |      |           |
|     |      |    |       | microcuries\]  |     |      |           |
|     |      |    |       | of radioactive |     |      |           |
|     |      |    |       | material on    |     |      |           |
|     |      |    |       | the test       |     |      |           |
|     |      |    |       | sample and     |     |      |           |
|     |      |    |       | must be        |     |      |           |
|     |      |    |       | performed by a |     |      |           |
|     |      |    |       | person         |     |      |           |
|     |      |    |       | approved by    |     |      |           |
|     |      |    |       | the Commission |     |      |           |
|     |      |    |       | or an          |     |      |           |
|     |      |    |       | Agreement      |     |      |           |
|     |      |    |       | State to       |     |      |           |
|     |      |    |       | perform the    |     |      |           |
|     |      |    |       | analysis.      |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(c\) Test     |     |      |           |
|     |      |    |       | frequency. (1) |     |      |           |
|     |      |    |       | Each sealed    |     |      |           |
|     |      |    |       | source (except |     |      |           |
|     |      |    |       | an energy      |     |      |           |
|     |      |    |       | compensation   |     |      |           |
|     |      |    |       | source (ECS))  |     |      |           |
|     |      |    |       | must be tested |     |      |           |
|     |      |    |       | at intervals   |     |      |           |
|     |      |    |       | not to exceed  |     |      |           |
|     |      |    |       | 6 months. In   |     |      |           |
|     |      |    |       | the absence of |     |      |           |
|     |      |    |       | a certificate  |     |      |           |
|     |      |    |       | from a         |     |      |           |
|     |      |    |       | transferor     |     |      |           |
|     |      |    |       | that a test    |     |      |           |
|     |      |    |       | has been made  |     |      |           |
|     |      |    |       | within the 6   |     |      |           |
|     |      |    |       | months before  |     |      |           |
|     |      |    |       | the transfer,  |     |      |           |
|     |      |    |       | the sealed     |     |      |           |
|     |      |    |       | source may not |     |      |           |
|     |      |    |       | be used until  |     |      |           |
|     |      |    |       | tested.        |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(2\) Each ECS |     |      |           |
|     |      |    |       | that is not    |     |      |           |
|     |      |    |       | exempt from    |     |      |           |
|     |      |    |       | testing in     |     |      |           |
|     |      |    |       | accordance     |     |      |           |
|     |      |    |       | with paragraph |     |      |           |
|     |      |    |       | (e) of this    |     |      |           |
|     |      |    |       | section must   |     |      |           |
|     |      |    |       | be tested at   |     |      |           |
|     |      |    |       | intervals not  |     |      |           |
|     |      |    |       | to exceed 3    |     |      |           |
|     |      |    |       | years. In the  |     |      |           |
|     |      |    |       | absence of a   |     |      |           |
|     |      |    |       | certificate    |     |      |           |
|     |      |    |       | from a         |     |      |           |
|     |      |    |       | transferor     |     |      |           |
|     |      |    |       | that a test    |     |      |           |
|     |      |    |       | has been made  |     |      |           |
|     |      |    |       | within the 3   |     |      |           |
|     |      |    |       | years before   |     |      |           |
|     |      |    |       | the transfer,  |     |      |           |
|     |      |    |       | the ECS may    |     |      |           |
|     |      |    |       | not be used    |     |      |           |
|     |      |    |       | until tested.  |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(d\) Removal  |     |      |           |
|     |      |    |       | of leaking     |     |      |           |
|     |      |    |       | source from    |     |      |           |
|     |      |    |       | service. (1)   |     |      |           |
|     |      |    |       | If the test    |     |      |           |
|     |      |    |       | conducted      |     |      |           |
|     |      |    |       | pursuant to    |     |      |           |
|     |      |    |       | paragraphs (a) |     |      |           |
|     |      |    |       | and (b) of     |     |      |           |
|     |      |    |       | this section   |     |      |           |
|     |      |    |       | reveals the    |     |      |           |
|     |      |    |       | presence of    |     |      |           |
|     |      |    |       | 185 Bq \[0.005 |     |      |           |
|     |      |    |       | microcuries\]  |     |      |           |
|     |      |    |       | or more of     |     |      |           |
|     |      |    |       | removable      |     |      |           |
|     |      |    |       | radioactive    |     |      |           |
|     |      |    |       | material, the  |     |      |           |
|     |      |    |       | licensee shall |     |      |           |
|     |      |    |       | remove the     |     |      |           |
|     |      |    |       | sealed source  |     |      |           |
|     |      |    |       | from service   |     |      |           |
|     |      |    |       | immediately    |     |      |           |
|     |      |    |       | and have it    |     |      |           |
|     |      |    |       | d              |     |      |           |
|     |      |    |       | econtaminated, |     |      |           |
|     |      |    |       | repaired, or   |     |      |           |
|     |      |    |       | disposed of by |     |      |           |
|     |      |    |       | an NRC or      |     |      |           |
|     |      |    |       | Agreement      |     |      |           |
|     |      |    |       | State licensee |     |      |           |
|     |      |    |       | that is        |     |      |           |
|     |      |    |       | authorized to  |     |      |           |
|     |      |    |       | perform these  |     |      |           |
|     |      |    |       | functions. The |     |      |           |
|     |      |    |       | licensee shall |     |      |           |
|     |      |    |       | check the      |     |      |           |
|     |      |    |       | equipment      |     |      |           |
|     |      |    |       | associated     |     |      |           |
|     |      |    |       | with the       |     |      |           |
|     |      |    |       | leaking source |     |      |           |
|     |      |    |       | for            |     |      |           |
|     |      |    |       | radioactive    |     |      |           |
|     |      |    |       | contamination  |     |      |           |
|     |      |    |       | and, if        |     |      |           |
|     |      |    |       | contaminated,  |     |      |           |
|     |      |    |       | have it        |     |      |           |
|     |      |    |       | decontaminated |     |      |           |
|     |      |    |       | or disposed of |     |      |           |
|     |      |    |       | by an NRC or   |     |      |           |
|     |      |    |       | Agreement      |     |      |           |
|     |      |    |       | State licensee |     |      |           |
|     |      |    |       | that is        |     |      |           |
|     |      |    |       | authorized to  |     |      |           |
|     |      |    |       | perform these  |     |      |           |
|     |      |    |       | functions.     |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | (e)(1)         |     |      |           |
|     |      |    |       | Hydrogen‑3     |     |      |           |
|     |      |    |       | (tritium)      |     |      |           |
|     |      |    |       | sources;       |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(4\) Sources  |     |      |           |
|     |      |    |       | of beta‑ or    |     |      |           |
|     |      |    |       | gamma‑         |     |      |           |
|     |      |    |       | emitting       |     |      |           |
|     |      |    |       | radioactive    |     |      |           |
|     |      |    |       | material with  |     |      |           |
|     |      |    |       | an activity of |     |      |           |
|     |      |    |       | 3.7 MBq \[100  |     |      |           |
|     |      |    |       | microcuries\]  |     |      |           |
|     |      |    |       | or less; and   |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(5\) Sources  |     |      |           |
|     |      |    |       | of alpha‑ or   |     |      |           |
|     |      |    |       | ne             |     |      |           |
|     |      |    |       | utron‑emitting |     |      |           |
|     |      |    |       | radioactive    |     |      |           |
|     |      |    |       | material with  |     |      |           |
|     |      |    |       | an activity of |     |      |           |
|     |      |    |       | 0.37 MBq \[10  |     |      |           |
|     |      |    |       | microcuries\]  |     |      |           |
|     |      |    |       | or less.       |     |      |           |
+-----+------+----+-------+----------------+-----+------+-----------+
| \   | De   |    | B     | **Amended      |     |      |           |
| '39 | sign |    |       | Section:**     |     |      |           |
| .41 | and  |    |       |                |     |      |           |
|     | per  |    |       | \(a\) A        |     |      |           |
|     | form |    |       | licensee may   |     |      |           |
|     | ance |    |       | use a sealed   |     |      |           |
|     | crit |    |       | source for use |     |      |           |
|     | eria |    |       | in well        |     |      |           |
|     | for  |    |       | logging        |     |      |           |
|     | sou  |    |       | applications   |     |      |           |
|     | rces |    |       | if ‑‑          |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(1\) The      |     |      |           |
|     |      |    |       | sealed source  |     |      |           |
|     |      |    |       | is doubly      |     |      |           |
|     |      |    |       | encapsulated;  |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(2\) The      |     |      |           |
|     |      |    |       | sealed source  |     |      |           |
|     |      |    |       | contains       |     |      |           |
|     |      |    |       | licensed       |     |      |           |
|     |      |    |       | material whose |     |      |           |
|     |      |    |       | chemical and   |     |      |           |
|     |      |    |       | physical forms |     |      |           |
|     |      |    |       | are as         |     |      |           |
|     |      |    |       | insoluble and  |     |      |           |
|     |      |    |       | nondispersible |     |      |           |
|     |      |    |       | as practical;  |     |      |           |
|     |      |    |       | and            |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(3\) Meets    |     |      |           |
|     |      |    |       | the            |     |      |           |
|     |      |    |       | requirements   |     |      |           |
|     |      |    |       | of paragraph   |     |      |           |
|     |      |    |       | (b), (c), or   |     |      |           |
|     |      |    |       | (d) of this    |     |      |           |
|     |      |    |       | section.       |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(b\) For a    |     |      |           |
|     |      |    |       | sealed source  |     |      |           |
|     |      |    |       | manufactured   |     |      |           |
|     |      |    |       | on or before   |     |      |           |
|     |      |    |       | July 14, 1989, |     |      |           |
|     |      |    |       | a licensee may |     |      |           |
|     |      |    |       | use the sealed |     |      |           |
|     |      |    |       | source, for    |     |      |           |
|     |      |    |       | use in well    |     |      |           |
|     |      |    |       | logging        |     |      |           |
|     |      |    |       | applications   |     |      |           |
|     |      |    |       | if it meets    |     |      |           |
|     |      |    |       | the            |     |      |           |
|     |      |    |       | requirements   |     |      |           |
|     |      |    |       | of USASI       |     |      |           |
|     |      |    |       | N5.10‑1968,    |     |      |           |
|     |      |    |       | \`\`           |     |      |           |
|     |      |    |       | Classification |     |      |           |
|     |      |    |       | of Sealed      |     |      |           |
|     |      |    |       | Radioactive    |     |      |           |
|     |      |    |       | Sources,\'\'   |     |      |           |
|     |      |    |       | or the         |     |      |           |
|     |      |    |       | requirements   |     |      |           |
|     |      |    |       | in paragraph   |     |      |           |
|     |      |    |       | (c) or (d) of  |     |      |           |
|     |      |    |       | this section.  |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(c\) For a    |     |      |           |
|     |      |    |       | sealed source  |     |      |           |
|     |      |    |       | manufactured   |     |      |           |
|     |      |    |       | after July 14, |     |      |           |
|     |      |    |       | 1989, a        |     |      |           |
|     |      |    |       | licensee may   |     |      |           |
|     |      |    |       | use the sealed |     |      |           |
|     |      |    |       | source, for    |     |      |           |
|     |      |    |       | use in well    |     |      |           |
|     |      |    |       | logging        |     |      |           |
|     |      |    |       | applications   |     |      |           |
|     |      |    |       | if it meets    |     |      |           |
|     |      |    |       | the oil‑well   |     |      |           |
|     |      |    |       | logging        |     |      |           |
|     |      |    |       | requirements   |     |      |           |
|     |      |    |       | of ANSI/HPS    |     |      |           |
|     |      |    |       | N43.6‑1997,    |     |      |           |
|     |      |    |       | \`\`Sealed     |     |      |           |
|     |      |    |       | Radioactive    |     |      |           |
|     |      |    |       | Sources‑‑Class |     |      |           |
|     |      |    |       | ification.\'\' |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(d\) For a    |     |      |           |
|     |      |    |       | sealed source  |     |      |           |
|     |      |    |       | manufactured   |     |      |           |
|     |      |    |       | after July 14, |     |      |           |
|     |      |    |       | 1989, a        |     |      |           |
|     |      |    |       | licensee may   |     |      |           |
|     |      |    |       | use the sealed |     |      |           |
|     |      |    |       | source, for    |     |      |           |
|     |      |    |       | use in well    |     |      |           |
|     |      |    |       | logging        |     |      |           |
|     |      |    |       | applications,  |     |      |           |
|     |      |    |       | if‑‑           |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(1\) The      |     |      |           |
|     |      |    |       | sealed         |     |      |           |
|     |      |    |       | source\'s      |     |      |           |
|     |      |    |       | prototype has  |     |      |           |
|     |      |    |       | been tested    |     |      |           |
|     |      |    |       | and found to   |     |      |           |
|     |      |    |       | maintain its   |     |      |           |
|     |      |    |       | integrity      |     |      |           |
|     |      |    |       | after each of  |     |      |           |
|     |      |    |       | the following  |     |      |           |
|     |      |    |       | tests: (i)     |     |      |           |
|     |      |    |       | Temperature.   |     |      |           |
|     |      |    |       | The test       |     |      |           |
|     |      |    |       | source must be |     |      |           |
|     |      |    |       | held at ‑40    |     |      |           |
|     |      |    |       | deg. C for 20  |     |      |           |
|     |      |    |       | minutes, 600   |     |      |           |
|     |      |    |       | deg. C for 1   |     |      |           |
|     |      |    |       | hour, and then |     |      |           |
|     |      |    |       | be subject to  |     |      |           |
|     |      |    |       | a thermal      |     |      |           |
|     |      |    |       | shock test     |     |      |           |
|     |      |    |       | with a         |     |      |           |
|     |      |    |       | temperature    |     |      |           |
|     |      |    |       | drop from 600  |     |      |           |
|     |      |    |       | deg. C to 20   |     |      |           |
|     |      |    |       | deg. C within  |     |      |           |
|     |      |    |       | 15 seconds.    |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(ii\) Impact  |     |      |           |
|     |      |    |       | test. A 5 kg   |     |      |           |
|     |      |    |       | steel hammer,  |     |      |           |
|     |      |    |       | 2.5 cm in      |     |      |           |
|     |      |    |       | diameter, must |     |      |           |
|     |      |    |       | be dropped     |     |      |           |
|     |      |    |       | from a height  |     |      |           |
|     |      |    |       | of 1 m onto    |     |      |           |
|     |      |    |       | the test       |     |      |           |
|     |      |    |       | source.        |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(iii\)        |     |      |           |
|     |      |    |       | Vibration      |     |      |           |
|     |      |    |       | test. The test |     |      |           |
|     |      |    |       | source must be |     |      |           |
|     |      |    |       | subject to a   |     |      |           |
|     |      |    |       | vibration from |     |      |           |
|     |      |    |       | 25 Hz to 500   |     |      |           |
|     |      |    |       | Hz at 5 g      |     |      |           |
|     |      |    |       | amplitude for  |     |      |           |
|     |      |    |       | 30 minutes.    |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(iv\)         |     |      |           |
|     |      |    |       | Puncture test. |     |      |           |
|     |      |    |       | A 1 gram       |     |      |           |
|     |      |    |       | hammer and     |     |      |           |
|     |      |    |       | pin, 0.3 cm    |     |      |           |
|     |      |    |       | pin diameter,  |     |      |           |
|     |      |    |       | must be        |     |      |           |
|     |      |    |       | dropped from a |     |      |           |
|     |      |    |       | height of 1 m  |     |      |           |
|     |      |    |       | onto the test  |     |      |           |
|     |      |    |       | source.        |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(v\) Pressure |     |      |           |
|     |      |    |       | test. The test |     |      |           |
|     |      |    |       | source must be |     |      |           |
|     |      |    |       | subject to an  |     |      |           |
|     |      |    |       | external       |     |      |           |
|     |      |    |       | pressure of    |     |      |           |
|     |      |    |       | 1.695 x 10^7^  |     |      |           |
|     |      |    |       | pascals        |     |      |           |
|     |      |    |       | \[24,600       |     |      |           |
|     |      |    |       | pounds per     |     |      |           |
|     |      |    |       | square inch    |     |      |           |
|     |      |    |       | absolute\].    |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(e\) The      |     |      |           |
|     |      |    |       | requirements   |     |      |           |
|     |      |    |       | in paragraphs  |     |      |           |
|     |      |    |       | (a), (b), (c), |     |      |           |
|     |      |    |       | and (d) of     |     |      |           |
|     |      |    |       | this section   |     |      |           |
|     |      |    |       | do not apply   |     |      |           |
|     |      |    |       | to sealed      |     |      |           |
|     |      |    |       | sources that   |     |      |           |
|     |      |    |       | contain        |     |      |           |
|     |      |    |       | licensed       |     |      |           |
|     |      |    |       | material in    |     |      |           |
|     |      |    |       | gaseous form.  |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(f\) The      |     |      |           |
|     |      |    |       | requirements   |     |      |           |
|     |      |    |       | in paragraphs  |     |      |           |
|     |      |    |       | (a), (b), (c), |     |      |           |
|     |      |    |       | and (d) of     |     |      |           |
|     |      |    |       | this section   |     |      |           |
|     |      |    |       | do not apply   |     |      |           |
|     |      |    |       | to energy      |     |      |           |
|     |      |    |       | compensation   |     |      |           |
|     |      |    |       | sources (ECS). |     |      |           |
|     |      |    |       | ECSs must be   |     |      |           |
|     |      |    |       | registered     |     |      |           |
|     |      |    |       | with the       |     |      |           |
|     |      |    |       | Commission     |     |      |           |
|     |      |    |       | under Sec.     |     |      |           |
|     |      |    |       | 32.210 of this |     |      |           |
|     |      |    |       | chapter or     |     |      |           |
|     |      |    |       | with an        |     |      |           |
|     |      |    |       | Agreement      |     |      |           |
|     |      |    |       | State.         |     |      |           |
+-----+------+----+-------+----------------+-----+------+-----------+
| \   | Ura  |    | C     | **Revised      |     |      |           |
| '39 | nium |    |       | Section:**     |     |      |           |
| .49 | si   |    |       |                |     |      |           |
|     | nker |    |       | The licensee   |     |      |           |
|     | bars |    |       | may use a      |     |      |           |
|     |      |    |       | uranium sinker |     |      |           |
|     |      |    |       | bar in well    |     |      |           |
|     |      |    |       | logging        |     |      |           |
|     |      |    |       | applications   |     |      |           |
|     |      |    |       | only if it is  |     |      |           |
|     |      |    |       | legibly        |     |      |           |
|     |      |    |       | impressed with |     |      |           |
|     |      |    |       | the words      |     |      |           |
|     |      |    |       | \`\`C          |     |      |           |
|     |      |    |       | AUTION‑‑RADIOA |     |      |           |
|     |      |    |       | CTIVE‑DEPLETED |     |      |           |
|     |      |    |       | URANIUM\'\'    |     |      |           |
|     |      |    |       | and \`\`NOTIFY |     |      |           |
|     |      |    |       | CIVIL          |     |      |           |
|     |      |    |       | AUTHORITIES    |     |      |           |
|     |      |    |       | (or COMPANY    |     |      |           |
|     |      |    |       | NAME) IF       |     |      |           |
|     |      |    |       | FOUND.\'\'     |     |      |           |
+-----+------+----+-------+----------------+-----+------+-----------+
| \   | En   |    | C     | **Revised      |     |      |           |
| '39 | ergy |    |       | Section:**     |     |      |           |
| .53 | comp |    |       |                |     |      |           |
|     | ensa |    |       | The licensee   |     |      |           |
|     | tion |    |       | may use an     |     |      |           |
|     | so   |    |       | energy         |     |      |           |
|     | urce |    |       | compensation   |     |      |           |
|     |      |    |       | source (ECS)   |     |      |           |
|     |      |    |       | which is       |     |      |           |
|     |      |    |       | contained      |     |      |           |
|     |      |    |       | within a       |     |      |           |
|     |      |    |       | logging tool,  |     |      |           |
|     |      |    |       | or other tool  |     |      |           |
|     |      |    |       | components,    |     |      |           |
|     |      |    |       | only if the    |     |      |           |
|     |      |    |       | ECS contains   |     |      |           |
|     |      |    |       | quantities of  |     |      |           |
|     |      |    |       | licensed       |     |      |           |
|     |      |    |       | material not   |     |      |           |
|     |      |    |       | exceeding 3.7  |     |      |           |
|     |      |    |       | MBq \[100      |     |      |           |
|     |      |    |       | microcuries\]. |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(a\) For well |     |      |           |
|     |      |    |       | logging        |     |      |           |
|     |      |    |       | applica-tions  |     |      |           |
|     |      |    |       | with a surface |     |      |           |
|     |      |    |       | casing for     |     |      |           |
|     |      |    |       | protecting     |     |      |           |
|     |      |    |       | fresh water    |     |      |           |
|     |      |    |       | aquifers, use  |     |      |           |
|     |      |    |       | of the ECS is  |     |      |           |
|     |      |    |       | only subject   |     |      |           |
|     |      |    |       | to the         |     |      |           |
|     |      |    |       | requirements   |     |      |           |
|     |      |    |       | of Secs.       |     |      |           |
|     |      |    |       | 39.35, 39.37   |     |      |           |
|     |      |    |       | and 39.39.     |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(b\) For well |     |      |           |
|     |      |    |       | logging        |     |      |           |
|     |      |    |       | applications   |     |      |           |
|     |      |    |       | without a      |     |      |           |
|     |      |    |       | surface casing |     |      |           |
|     |      |    |       | for protecting |     |      |           |
|     |      |    |       | fresh water    |     |      |           |
|     |      |    |       | aquifers, use  |     |      |           |
|     |      |    |       | of the ECS is  |     |      |           |
|     |      |    |       | only subject   |     |      |           |
|     |      |    |       | to the         |     |      |           |
|     |      |    |       | requirements   |     |      |           |
|     |      |    |       | of Secs.       |     |      |           |
|     |      |    |       | 39.15, 39.35,  |     |      |           |
|     |      |    |       | 39.37, 39.39,  |     |      |           |
|     |      |    |       | 39.51, and     |     |      |           |
|     |      |    |       | 39.77.         |     |      |           |
+-----+------+----+-------+----------------+-----+------+-----------+
| \   | Tri  |    | C     | **Revised      |     |      |           |
| '39 | tium |    |       | Section:**     |     |      |           |
| .55 | neu  |    |       |                |     |      |           |
|     | tron |    |       | \(a\) Use of a |     |      |           |
|     | g    |    |       | tritium        |     |      |           |
|     | ener |    |       | neutron        |     |      |           |
|     | ator |    |       | generator      |     |      |           |
|     | ta   |    |       | target source, |     |      |           |
|     | rget |    |       | containing     |     |      |           |
|     | so   |    |       | quantities not |     |      |           |
|     | urce |    |       | exceeding      |     |      |           |
|     |      |    |       | 1,110 MBq \[30 |     |      |           |
|     |      |    |       | curies\] and   |     |      |           |
|     |      |    |       | in a well with |     |      |           |
|     |      |    |       | a surface      |     |      |           |
|     |      |    |       | casing to      |     |      |           |
|     |      |    |       | protect fresh  |     |      |           |
|     |      |    |       | water          |     |      |           |
|     |      |    |       | aquifers, is   |     |      |           |
|     |      |    |       | subject to the |     |      |           |
|     |      |    |       | requirements   |     |      |           |
|     |      |    |       | of this part   |     |      |           |
|     |      |    |       | except Secs.   |     |      |           |
|     |      |    |       | 39.15, 39.41,  |     |      |           |
|     |      |    |       | and 39.77. (b) |     |      |           |
|     |      |    |       | Use of a       |     |      |           |
|     |      |    |       | tritium        |     |      |           |
|     |      |    |       | neutron        |     |      |           |
|     |      |    |       | generator      |     |      |           |
|     |      |    |       | target source, |     |      |           |
|     |      |    |       | containing     |     |      |           |
|     |      |    |       | quantities     |     |      |           |
|     |      |    |       | exceeding      |     |      |           |
|     |      |    |       | 1,110 MBq \[30 |     |      |           |
|     |      |    |       | curies\] or in |     |      |           |
|     |      |    |       | a well without |     |      |           |
|     |      |    |       | a surface      |     |      |           |
|     |      |    |       | casing to      |     |      |           |
|     |      |    |       | protect fresh  |     |      |           |
|     |      |    |       | water          |     |      |           |
|     |      |    |       | aquifers, is   |     |      |           |
|     |      |    |       | subject to the |     |      |           |
|     |      |    |       | requirements   |     |      |           |
|     |      |    |       | of this part   |     |      |           |
|     |      |    |       | except Sec.    |     |      |           |
|     |      |    |       | 39.41.         |     |      |           |
+-----+------+----+-------+----------------+-----+------+-----------+
| \   | Noti |    | C     | **Revised      |     |      |           |
| '39 | fica |    |       | Paragraph      |     |      |           |
| .77 | tion |    |       | (c)(1) and     |     |      |           |
|     | of   |    |       | added          |     |      |           |
|     | i    |    |       | paragraph      |     |      |           |
|     | ncid |    |       | (d)(9):**      |     |      |           |
|     | ents |    |       |                |     |      |           |
|     | and  |    |       | (c)(1) Notify  |     |      |           |
|     | lost |    |       | the            |     |      |           |
|     | sour |    |       | appropriate    |     |      |           |
|     | ces; |    |       | NRC Regional   |     |      |           |
|     | aba  |    |       | Office by      |     |      |           |
|     | ndon |    |       | telephone of   |     |      |           |
|     | ment |    |       | the            |     |      |           |
|     |      |    |       |                |     |      |           |
|     | pr   |    |       | circumstances  |     |      |           |
|     | oced |    |       | that resulted  |     |      |           |
|     | ures |    |       | in the         |     |      |           |
|     | for  |    |       | inability to   |     |      |           |
|     | i    |    |       | retrieve the   |     |      |           |
|     | rret |    |       | source and‑‑   |     |      |           |
|     | riev |    |       |                |     |      |           |
|     | able |    |       | \(i\) Obtain   |     |      |           |
|     | sou  |    |       | NRC approval   |     |      |           |
|     | rces |    |       | to implement   |     |      |           |
|     |      |    |       | abandonment    |     |      |           |
|     |      |    |       | procedures; or |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | \(ii\) That    |     |      |           |
|     |      |    |       | the licensee   |     |      |           |
|     |      |    |       | implemented    |     |      |           |
|     |      |    |       | abandonment    |     |      |           |
|     |      |    |       | before         |     |      |           |
|     |      |    |       | receiving NRC  |     |      |           |
|     |      |    |       | approval       |     |      |           |
|     |      |    |       | because the    |     |      |           |
|     |      |    |       | licensee       |     |      |           |
|     |      |    |       | believed there |     |      |           |
|     |      |    |       | was an         |     |      |           |
|     |      |    |       | immediate      |     |      |           |
|     |      |    |       | threat to      |     |      |           |
|     |      |    |       | public health  |     |      |           |
|     |      |    |       | and safety;    |     |      |           |
|     |      |    |       | and            |     |      |           |
|     |      |    |       |                |     |      |           |
|     |      |    |       | (d)(9) The     |     |      |           |
|     |      |    |       | immediate      |     |      |           |
|     |      |    |       | threat to      |     |      |           |
|     |      |    |       | public health  |     |      |           |
|     |      |    |       | and safety     |     |      |           |
|     |      |    |       | justification  |     |      |           |
|     |      |    |       | for            |     |      |           |
|     |      |    |       | implementing   |     |      |           |
|     |      |    |       | abandonment if |     |      |           |
|     |      |    |       | prior NRC      |     |      |           |
|     |      |    |       | approval was   |     |      |           |
|     |      |    |       | not obtained   |     |      |           |
|     |      |    |       | in accordance  |     |      |           |
|     |      |    |       | with paragraph |     |      |           |
|     |      |    |       | (c)(1)(ii) of  |     |      |           |
|     |      |    |       | this section;  |     |      |           |
+-----+------+----+-------+----------------+-----+------+-----------+