Dose Conversion Factors (DCFs) and Air Concentration Value (ACV) for ITPs

DOE-HDBK-1184-2004

5.2.4

Dose Conversion Factors (DCFs) and Air Concentration Value (ACV) for ITPs

The broad range of SAF derivations in the previous section allows correction of

dose conversion factors (DCFs) for self-absorption across a broad range of */-/rials

and size distributions. The goal of these derivations and corrections in Section

5.2.2 is to determine a limiting ("worst case") self-absorption-corrected DCF among

a variety of materials with wide variation in SAF. The variability of DCF as a

function of particle size distribution is also assessed. This determination of a

limiting DCF for ITPs allows a material-independent approach to air sampling and

surface surveys following that point. A readily implemented approach, utilizing data

obtained in terms of "observed" activity, is also provided.

5.2.4.1 Dose Conversion Factors (DCFs) for ITPs

Using LuDEP, the DCFs for lung CDE and CEDE were calculated for a variety of

ITP materials and particle size distributions using the default assumptions given in

Table 5-5 (except for particle size). The results are shown in Tables 5-11 and 5-12

below. LuDEP makes no allowance for self-absorption within particulates.

Table 5-11. Lung CDE DCFs (Sv/Bq) for Various ITPs and Particle Sizes

(AMAD, s g = 2.5), Type S Assumed

Lung DCF vs. Particle Size [AMAD ( m), s g = 2.5]

Base Material*

0.5

- 10

-9

1.64x10- 9

Organic [∼(CH2)n]

4.50x10

9.90x10

1.65x10

1.74x10

4.51x10- 10

1.00x10- 9

1.71x10- 9

1.98x10- 9

2.29x10- 9

Rust [∼FeO(OH)]

4.51x10- 10

1.00x10- 9

1.74x10- 9

2.07x10- 9

2.52x10- 9

Ti H2

4.53x10- 10

1.01x10- 9

1.81x10- 9

2.30x10- 9

3.07x10- 9

Zr H2

4.56x10- 10

1.03x10- 9

1.94x10- 9

2.70x10- 9

3.87x10- 9

Hf H2

* Variable amounts of elemental hydrogen are isotopically tritium.

NOTE: The reason the DCFs differ slightly for a given AMAD in Table 5- 11 is that

the densities differ and the density affects the deposition fractions in the

various lung compartments.

Table 5-12. DCF (Sv/Bq), CEDE, for Various ITPs and Particle Sizes (AMAD, s g = 2.5),

Type S Assumed

CEDE DCF vs. Particle Size [AMAD ( m), s g

= 2.5]

Base Material*

0.5

6.10x10- 11

1.27x10- 10 2.05x10- 10

2.14x10- 10

2.00x10- 10

Organic [∼(CH2)n]

6.11x10- 11

1.28x10- 10 2.13x10- 10

2.43x10- 10

2.79x10- 10

Rust [∼FeO(OH)]

6.15x10- 11

1.28x10- 10 2.16x10- 10

2.54x10- 10

3.07x10- 10

Ti H2

6.17Ηx10-11 1.3x10-1 0

2.25x10- 10

2.83x10- 10

3.74x10- 10

Zr H2

6.20x10- 11

1.32x10- 10 2.41x10- 10

3.30x10- 10

4.70x10- 10

Hf H2

* Variable amounts of elemental hydrogen are isotopically tritium.