P. Christensen et Rv. Griffith, REQUIRED ACCURACY AND DOSE THRESHOLDS IN INDIVIDUAL MONITORING, Radiation protection dosimetry, 54(3-4), 1994, pp. 279-285
Citations number
NO
Categorie Soggetti
Radiology,Nuclear Medicine & Medical Imaging","Nuclear Sciences & Tecnology
The paper follows the approach given in recent revisions of CEC and IA
EA recommendations on requirements in individual monitoring for extern
al radiations. The ICRP requirements on overall accuracy for individua
l monitoring, as given in ICRP Publication 35 (1982), form the basis f
or the specification of detailed accuracy requirements which are neede
d in practical routine monitoring. The ICRP overall accuracy requireme
nt is defined as an allowable maximum uncertainty factor at the 95% co
nfidence level for a single measurement of the relevant dose quantity,
i.e. H(p)(10) and H(p)(0.07). From this uncertainty factor, a value o
f 21% can be evaluated for the allowable maximum overall standard devi
ation for dose measurements at dose levels near the annual dose limits
increasing to 45% for dose levels at the lower end of the dose range
required to be monitored. A method is described for evaluating the ove
rall standard deviation of the dosimetry system by combining random an
d systematic uncertainties in quadrature, and procedures are also give
n for determining each individual uncertainty connected to the dose me
asurement. In particular, attention is paid to the evaluation of the c
ombined uncertainty due to energy and angular dependencies of the dose
meter. In type testing of personal dosimetry systems, the estimated ov
erall standard deviation of the dosimetry system is the main parameter
to be tested. An important characteristic of a personal dosimetry sys
tem is its capability of measuring low doses. The paper discusses diff
erent definitions of the lower detectability of dosimetry systems for
individual monitoring.