Sampling size in the verification of manufactured-supplied air kerma strengths

Quality control mandate that the air kerma strengths (S(K)) of permanent seeds be verified, this is usually done by statistics inferred from 10% of the seeds. The goal of this paper is to proposed a new sampling method in which the number of seeds to be measured will be set beforehand according to a...

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Bibliographic Details
Published inMedical physics (Lancaster) Vol. 32; no. 11; p. 3375
Main Authors Ramos, Luis Isaac, Martinez Monge, Rafael
Format Journal Article
LanguageEnglish
Published United States 01.11.2005
Subjects
Air
Brachytherapy - instrumentation
Calibration
Humans
Models, Statistical
Normal Distribution
Probability
Quality Control
Radiometry
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted
Reproducibility of Results
Sample Size
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Summary:Quality control mandate that the air kerma strengths (S(K)) of permanent seeds be verified, this is usually done by statistics inferred from 10% of the seeds. The goal of this paper is to proposed a new sampling method in which the number of seeds to be measured will be set beforehand according to an a priori statistical level of uncertainty. The results are based on the assumption that the S(K) has a normal distribution. To demonstrate this, the S(K) of each of the seeds measured was corrected to ensure that the average S(K) of its sample remained the same. In this process 2030 results were collected and analyzed using a normal plot. In our opinion, the number of seeds sampled should be determined beforehand according to an a priori level of statistical uncertainty.
ISSN:0094-2405
DOI:10.1118/1.2089627