Dose conversion factor

The dose conversion factor , sometimes dose conversion factor called English. dose conversion factor (DCF), establishes a relationship between the measured decay rate of a radioactive emitter (unit Becquerel ) that has entered the human body and the radiation exposure , expressed as an equivalent dose with the unit Sievert (Sv). The dose conversion factors usually relate to a 50-year equivalent dose and indicate which dose is accumulated per becquerel over a period of 50 years after the incorporation of a source.

The dose conversion factor depends on physical and physiological parameters:

• Composition of the emitter ( isotope or isotope mixture)
• Type of radiation of the isotope ( alpha , beta or gamma radiation )
• Radiation energies of the isotope
• Type of absorption of the emitter (via skin, lungs or gastrointestinal mucous membranes)

The dose conversion factors of some substances are:

substance	description	DCF	admission	Half-life
137 Cesium	element	1.3 * 10 −8 Sv / Bq		30.2 years
131 iodine	element	2.2 * 10 −8 Sv / Bq 0.7 * 10 −8 Sv / Bq 1.3 * 10 −8 Sv / Bq 43 * 10 −8 Sv / Bq 350 * 10 −8 Sv / Bq	Ingestion inhalation whole body thyroid thyroid infant	8 days
226 radium	element	22 * 10 −8 Sv / Bq		1,600 years
90 strontium	element	2.8 * 10 −8 Sv / Bq		28.6 years
40 potassium	element	0.45 * 10 −8 Sv / Bq		1.28 * 10 9 years
60 cobalt	element	0.54 * 10 −8 Sv / Bq		5.2 years
210 polonium	element	60 * 10 −8 Sv / Bq		138 days
18 F-2-FDG	Contrast media	2 * 10 −11 Sv / Bq	intravenous injection	109.8 minutes

When determining dose conversion factors, an attempt is first made to calculate an organ dose based on the specific sensitivity of the affected tissue and model assumptions (for example, the distribution of secondary products in the respiratory organs, the type of breathing and physical activity). The dose conversion factor is then determined by comparing it with epidemiological studies. Depending on the model assumptions made, the numerical value deviates by a factor of 10 and more.

Dose conversion factors are tabulated within the radiation protection ordinance of a country.

Individual evidence

1. ↑ Guidelines for Canadian Drinking Water Quality: Guideline Technical Document , some of the values ​​can be found under TABLE II-III. Committed Effective Dose Per Unit Intake via Inhalation and Ingestion (Sv / Bq) for Workers : The RADAR site: Internal Sources - Occupational Exposures (Accessed September 19, 2013)
2. ↑ cf. Lecture script , p. 277f ( Memento of the original dated August 13, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF; 542 kB) 
3. ↑ for Germany in an addendum to StrlSchV , cf. Federal Gazette No. 160a and b of August 28, 2001 Part I, II, IV and V