# Help:Dose Coefficients (ICRP 68 & 72)

Level: Intermediate

## Contents |

## Introduction

A measure of the hazard of nuclear material is provided by the toxicity and in particular the radiotoxicity arising from its radioactive “quality” rather than the chemical toxicity. The radiotoxicity of a nuclide is determined by its effective dose coefficient *e*(T), which accounts for radiation and tissue weighting factors, metabolic and biokinetic information. The quantity T is the integration time in years following intake. For adults, the integration time is 50 years, such that the radiotoxicity (in Sievert, Sv) or committed effective dose resulting from intake of a particular nuclide is the product of the effective dose coefficient (units Sv/Bq) and the activity (in Bq) of that nuclide i.e.

Committed effective dose = Activity · *e*(50).

The two main pathways for intake of a radionuclide are through ingestion and inhalation. Accordingly one can differentiate between the ingestion dose coefficient *e*_{ing}(50) and the inhalation dose coefficient *e*_{inh}(50).

## Using the Dose Coefficients Database in Nucleonica

The user interface for the Dose Coefficients application in Nucleonica is shown. On launching the application, default setting are used. In this mode, all dose coefficients (ICRP 68 &72, inhalation and ingestion) are listed in the datagrid. The information in this grid can be filter by using the check boxes, radio buttons and drop-down menu as shown.

#### Re-arranging the data in ascending/descending order

By default the data is arranged by nuclide in ascending order (by Z and mass number). To sort by dose coefficient, the user can check the appropriate header in the table to arrange in ascending / descending order. A small triangle is shown which is either pointing up (for ascending order) or down (for descending order).

This action, however, will just rearrange the entries in the data page shown.

To re-arrange the entire dataset, the user should then click on the scroll bar below the datagrid (on |< or <|). The entire dataset will then be re-arranged in ascending / descending order.

## Example: Dose Coefficients of Pu Isotopes

In another example (results shown), the ICRP Dose Coefficients database is searched for the effective dose coefficients of plutonium isotopes. The results are shown for both the inhalation and ingestion dose coefficients e(50) with units of Sv/Bq from both the ICRP (International Commission for Radiological Protection) databases, ICRP 68 and the more recent ICRP 72.

## References

The effective dose coefficients given in the Nucleonica databases are taken from:

ICRP PUBLICATION 119, 2012, Compendium of Dose Coefficients based on ICRP Publication 60

See also Compendium of Dose Coefficients based on ICRP Publication 60

See Also... Effective Dose Coefficients, Biological Effect of Ionising Radiation, Effective dose, Equivalent dose, Committed effective dose, Committed equivalent dose, Radon dose conversion factors

Additional references (in German)...