Table 5-13 shows the CEDE DCFs, corrected for SAFe, for various ITPs

DOE-HDBK-1184-2004

NOT E: In Table 5-12, the CEDE DCF for rust, 1 m AMAD, differs slightly from

the CEDE DCF given in ICRP 71 for Type S tritiated aerosols (2.6 10-10

Sv/Bq), even though the particle size distribution and densities are

identical. The reason for this difference is that the ICRP 71 value was

computed using the default "Environmental" assumptions (e. g., individual

is sleeping 33.3% of the time) and the values given in the table above

were computed using the default "Occupational" assumptions because this

document focuses on occupational protection.

The DCFs given in Tables 5-11 and 5-12 were not corrected to account for SAFe.

Therefore, the component of the lung DCFs is significantly exaggerated. In order to

determine more realistic DCFs, it is necessary to correct the lung dose for SAFe

using the values from Table 5-9.

NOTE: This correction should only be applied to lung dose from particulates and

not HTO in the lung that results from the dissolution of the particle.

However for absorption class S materials, the rate of dissolution is so slow

that the contribution to the lung dose is negligible.

The correction for SAFe is made as follows:

DCF(corrected for SAFe) = DCF(uncorrected) - 0.12*DCFlung + 0.12*DCFlung x SAFe

(Eq.5-9)

where:

DCF(uncorrected) is CEDE per unit intake (Sv/Bq; values from Table 5-12)

0.12 is the ICRP 26 weighting factor for lung

DCFlung is the Lung CDE per unit intake (Sv/Bq; values from Table5-11)

SAFe is the corresponding value from Table5- 9

Table 5-13 shows the CEDE DCFs, corrected for SAFe, for various ITPs.

Table 5-13. DCF (Sv/Bq), CEDE, for Various ITPs and Particle Sizes (AMAD, s g = 2.5),

Type S Assumed, with SAFe Corrections Applied to the Lung Dose Component

CEDE DCF (w/ SAFe) vs. Particle Size [AMAD (m), s g = 2.5]

Base Material*

0.5

-11

-10

Organic [∼(CH2)n]

2.35x10

6.41x10

1.47x10

1.81x10

1.85x10

-11

-10

Rust [∼FeO(OH)]

1.95x10

5.35x10

1.34x10

1.88x10

2.45x10

-11

-1

-10

Ti H2

1.90x10

5.17x10

1.32x10

1.93x10

2.67x10

-11

-10

Zr H2

1.71x10

4.62x10

1.25x10

2.03x10

3.19x10

-11

-10

Hf H2

1.51x10

4.03x10

1.22x10

2.27x10

3.97x10

* Variable amounts of elemental hydrogen are isotopically tritium.

CEDE DCFs in Table 5-13 are now smaller than the CEDE DCFs in Table 5-12,

because of the corrections for particulate energy self-absorption. In order to use

the values shown in Table 5-13, the "actual" activity inhaled must be known. Air

monitoring can be performed via batch air filtration sampling and subsequent LSC

analysis of the collected ITPs. An indicator of air concentration potential can also