# Presentation: 498861

## 10 CFR 835 Amendment

**10 CFR 835 Amendment**
** **
**Peter O’Connell**
**CHP**
**Office of Health and Safety**
**U.S. Department of Energy**
**DOE Radiation Protection Workshop**
**November 2007**

## What Did We Do?

**What Did We Do?**

**Adopted the system of radiation dosimetry recommended in ICRP Publication 60.**

## Why Did We Do It? 

**Why Did We Do It?**** **

**To assess and record radiation dose received by DOE workers in accordance with updated accepted methods.**

## What We Changed 

**What We Changed **

- Specified new dosimetric terminology/quantities based on ICRP 60/68 in place of ICRP 26/30
- Specified ICRP 60 Tissue Weighting Factors in place of ICRP 26 Weighting Factors
- Specified ICRP 60 Radiation Weighting Factors in place of ICRP 26 Quality Factors
**Amended other parts of the regulation that changed as a result of adopting ICRP 60 dosimetry system and the resultant ICRP 68 dose conversion factors **

## Dosimetric Terms/Quantities 

**Dosimetric Terms/Quantities **

| Old                            | New |
| --- | --- |
| Committed effective dose equivalent | Committed effective dose |
| Committed dose equivalent | Committed equivalent dose |
| Cumulative total effective dose equivalent | Cumulative total effective dose |
| Dose equivalent | Equivalent dose |
| Effective dose equivalent | Effective dose |
| Quality factor | Radiation weighting factor |
| Weighting factor | Tissue weighting factor |
| Total effective dose equivalent | Total effective dose |

## Quality Factors  to

**Quality Factors  to**
**Radiation Weighting Factors**

| Radiation Type | Quality Factor | Radiation Weighting Factor |
| --- | --- | --- |
| Neutrons, energy < 10 keV | 3 | 5 |
| Neutrons, energy 10 keV to 100 keV  | 10 | 10 |
| Neutrons, energy > 100 keV to 2 MeV  | 10 | 20 |
| Neutrons, energy > 2 MeV to 20 MeV  | 10 | 10 |
| Neutrons, energy > 20 MeV  | 10 | 5 |
| Neutrons, unknown energy | 10 | 20 |
| Spectral data are sufficient to identify the energy of the neutrons  | Table titled “Quality Factors for Neutrons” 
(10 CFR 835 section 2(b)) | Formula taken from ICRP 60., appendix A, paragraph A12. |

## Quality Factors  to

**Quality Factors  to**
**Radiation Weighting Factors**
**(continued)**

| Radiation Type | Quality Factor | Radiation Weighting Factor |
| --- | --- | --- |
| X-rays, gamma rays, positrons, electrons (including tritium beta particles) | 1 |  |
| Photons, electrons and muons, all energies  |  | 1 |
| Protons and singly-charged particles of unknown energy with rest mass greater than one atomic unit  | 10 |  |
| Protons, other than recoil protons, energy > 2 MeV  |  | 10 |
| Alpha particles and multiple-charged particles (and particles of unknown charge) of unknown energy  | 20 |  |
| Alpha particles, fission fragments, heavy nuclei  |  | 20 |

## Weighting Factors  to Tissue Weighting Factors 

**Weighting Factors  to Tissue Weighting Factors **

| Tissue/Organ | Weighting Factors | Tissue Weighting Factors |
| --- | --- | --- |
| Gonads | 0.25 | 0.20 |
| Red bone marrow  | 0.12 | 0.12 |
| Colon  |  | 0.12 |
| Lungs  | 0.12 | 0.12 |
| Stomach  |  | 0.12 |
| Bladder  |  | 0.05 |
| Breast  | 0.15 | 0.05 |
| Liver  |  | 0.05 |
| Esophagus  |  | 0.05 |
| Thyroid  | 0.03 | 0.05 |
| Skin  |  | 0.01 |

## Weighting Factors  to Tissue Weighting Factors

**Weighting Factors  to Tissue Weighting Factors**
**(continued)**** **

| Tissue/Organ | Weighting Factors | Tissue Weighting Factors |
| --- | --- | --- |
| Bone surface | 0.03 | 0.01 |
| Remainder  | 0.30 | 0.05 |
| Whole body | 1.00 | 1.00 |

**Weighting Factor Remainder: The five other organs or tissues, excluding the skin and lens of the eye, with the highest dose (e.g., liver, kidney, spleen, thymus, adrenal, pancreas, stomach, small intestine, and upper large intestine).  The weighting factor for each remaining organ or tissue is 0.06.**
**Tissue Weighting Factor Remainder: The following additional tissues and organs and their masses, in grams, following parenthetically: adrenals (14), brain (1400), extrathoracic airways (15), small intestine (640), kidneys (310), muscle (28,000), pancreas (100), spleen (180), thymus (20), and uterus (80). The equivalent dose to the remainder tissues (H****rem****), is normally calculated as the mass-weighted mean dose to the preceeding ten organs and tissues.  In those cases in which the most highly irradiated remainder tissue or organ receives the highest equivalent dose of all the organs, a weighting factor of 0.025 (half of remainder) is applied to that tissue or organ and 0.025 (half of remainder) to the mass-weighted equivalent dose in the rest of the remainder tissues and organs to give the remainder equivalent dose. **

## Other Changes

**Other Changes**

- Appendices A (DAC values for inhalation), C(DAC values for immersion) and E (sealed source accountability values) revised for consistency with ICRP 68 dose conversion factors and 5 μm default AMAD for particles.
- Replaced the following terms:

| Deleted terms: Not defined in ICRP 60 or 68 | Replacement Terms
(Not added to definitions because the meaning is clear) | Depth in tissue (cm) |
| --- | --- | --- |
| Deep dose equivalent | Equivalent dose to the whole body | 1.000 |
| Shallow dose equivalent | Equivalent dose to the skin or to an extremity | 0.007 |
| Lens of the eye dose equivalent | Equivalent  dose to the lens of the eye | 0.300 |

## Other Changes  

**Other Changes **** **

- Clarify transportation exclusion
-  **Radioactive material transportation not performed by DOE or a DOE contractor is excluded**
** ****Posting and access control not needed for radioactive material transportation performed by DOE or a DOE contractor under continuous control or labeled per DOT**
** ****Receipt monitoring not required for onsite shipments which have been under continuous control**
- Exclude material, equipment, and real property approved for release in accordance with DOE approved authorized limits
** ****HS-20 developing guidance**

## Other Changes (cont) 

**Other Changes (cont)**** **

- Lowers the maximum amount of radioactive material which need not be labeled
-  0.1 Ci
-  labeling threshold would otherwise be 15 Ci for tritium
- Allows use of thresholds for recording internal occupational exposures
-  less than 10 mrem per result
-  less than monitoring threshold per year

## Other Changes (cont) 

**Other Changes (cont)**** **

- Establishes DAC default values for radionuclides not listed in the rule
-  **Non alpha emitters and with radioactive half-life greater than two hours -  4 E−11 μCi/mL **
** ****Alpha emitters - 2 E−13 μCi/mL **
- Appendix D – not significantly changed
** ****Considered adding intermediate level for Sr-90 mixtures**

## Important Dates 

**Important Dates**** **

- Effective Date:   July 9, 2007
- Submit RPP:  Up to 180 days after effective date (January 4, 2008)
- DOE Approves RPP:  Up to 180 days after submission to DOE (July 3, 2008)
- Full compliance:  Three years after effective date (July 9, 2010)