7. End-point dosimetry
When handling radioactive elements, or in cases such as interventional radiography (surgery followed by X-rays), the hands can be particularly exposed. For extremity dosimetry, we generally use rings or bracelets incorporating TLDs. The energy response curve for LiF (one of the most interesting materials for this application) shows an overestimation of almost 50% at photon energies of around 50 keV, which must be taken into account, corresponding to the X-ray range.
Some electronic personal dosimeters, such as the DMC2000, can be supplied with a silicon diode for extremity dosimetry. In this case, you benefit from the advantages of operational dosimetry (on-line reading of dose or dose rate, alarms).
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Bibliography
References
- (1) - van DIJK (J.W.E.), BORDY (J.M.), VANHAVERE (F.), WERNLI (C.), ZAMANI-VALASIADOU (M.) - A review of the properties of the dosimetric systems and the quality assurance programmes of 48 dosimetric services in the European Union and Switzerland. - Radiation-Protection-Dosimetry, vol. 96, n° 1, p. 151-157 (2001)....
Standardization
The International Organization for Standardization (ISO) website can be consulted:
Standards dealing with references or methods
- Reference X-rays and gamma rays for calibrating dosimeters and flowmeters, and for determining their response as a function of photon energy. – Part 1: Radiation characteristics...
Regulations
ICRU documents relating to the measurement of external radiation doses :
ICRU 39 (1985) Determination of Dose Equivalents Resulting from External Radiation Sources ;
ICRU 43 (1988) Determination of Dose Equivalents from External Radiation Sources – Part 2 ;
ICRU 47 (1992) Measurement of Dose Equivalents from...
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