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Uranium Radiation Age-specific Dose Calculator - HELP

(last updated 9 Feb 2003)

Contents:


Introduction

This calculator performs age-dependent radiation dose calculations for individuals exposed to uranium and/or its decay products. The calculator handles exposure from inhalation and ingestion.
The calculator considers the uranium-isotopes U-238, U-235, and U-234 and their major decay products.
The set of dose coefficients used is from ICRP 72 (Public).

For dose calculations for adults, the Uranium Radiation Individual Dose Calculator offers more options. If organ-specific doses for adults are required, see the Uranium Radiation Organ Dose Calculator.
The calculator only determines exposure to radiation; the chemical toxicity of uranium is not covered (see Uranium Toxicity).
The calculator only determines doses to exposed individuals. For collective dose calculations, see the Nuclear Fuel Population Health Risk Calculator.
The calculator only determines doses for situations, where the pathway and the rate of exposure to a contaminant is known. Otherwise, some more sophisticated software has to be used (see Uranium Mine and Mill Resident Individual Dose Calculator and Dose calculation software).

The parameters used for the calculation can be set in the Input, Exposure Parameters and Consumption Parameters tables. These parameters show reasonable initial values which can be modified as needed. There are no other hidden parameters used in the calculation. Any assumptions made for the calculations are described on this page.

The Calculator uses the dose coefficients from ICRP 72. At present, the dose coefficients of ICRP 60/61 (1990) are widely used, while revised dose coefficients have been presented for workers in ICRP 68 (1995) and for the public in ICRP 72 (1997). The new dose factors show significant differences from the old ones for the nuclides of interest.
The calculator simplistically uses only the committed effective dose coefficients, rather than the organ specific dose coefficients. It thus does not perform the exact calculations prescribed by ICRP; the results are approximations only.

The calculator is suitable for offline use.

 

Input

Material Input
Enter number and select appropriate mass unit and material type.
It is assumed that short lived decay products are in equilibrium with their parent nuclides.

Activities [Bq]
No input is required, if data was entered in the Material Input section: the appropriate activities are entered automatically.
But, for nuclide mixes other than those given in the Material Type pick list, activities can be entered directly. It is also possible to modify activity data after selection from the pick list.

 

Exposure Parameters

Exposure Situation
select one

Rate
Select "once" to calculate dose from single uptake, or any of the other options to determine annual dose rates (assuming continuous exposure).

Parameters
Select appropriate solubility class for inhalation
For inhalation, an activity median aerodynamic diameter (AMAD) of 1 Ám is assumed, and the solubility Class can be selected according to the chemical form of the uranium:

Solubility ClassChemical formf1
age <= 1 yage > 1 y
FUF6, UO2F2, UO2(NO3)20.040.02
MUO3, UF4, UCl40.040.02
SUO2, U3O8 0.020.002

For decay products, the calculator assumes the same solubility class as for the parent nuclide.
For ingestion, there is no distinction between solubility classes in ICRP 72.

 

Consumption Parameters

Enter age-specific consumption rates
The "Init data set" pick list and the "Food type" pick list can be used to initialize the consumption values, but own values can also be entered - from scratch or by modifying initialized values. The predefined data sets are from: The age ranges are defined as follows:

 Age
3 mo1 y5 y10 y15 yAdult
Age range<= 1 y> 1 ... <= 2 y> 2 ... <= 7 y> 7 ... <= 12 y> 12 ... <= 17 y> 17 y

Note for StrlSchV 2001 (Germany): Add another 115 ltr/year to the drinking water amount for age 3 months, if the infant receives no breastfeed (not shown in the pick list).

 

Output

The Results field shows the Committed Effective Dose for single exposure, or the Committed Effective Dose Rate otherwise.

The contents of the Results field can be highlighted for copying and pasting to other applications.

 

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