首次使用基于气体电子倍增器（GEM）的组织等效正比计数器（TEPC）进行微剂量测量。

First microdosimetric measurements with a TEPC based on a GEM.

作者信息

Farahmand M, Bos A J J, De Nardo L, van Eijk C W E

机构信息

Delft University of Technology, IRI, 2629 JB Delft, The Netherlands.

出版信息

Radiat Prot Dosimetry. 2004;110(1-4):839-43. doi: 10.1093/rpd/nch144.

DOI:10.1093/rpd/nch144

PMID:15353756

Abstract

A new type of mini multi-element tissue-equivalent proportional counter (TEPC) based on a gas electron multiplier (GEM) has been designed and constructed. This counter is in particular suitable to be constructed with a small sensitive volume so that it can be used for microdosimetry in intense pulsed radiation fields to measure the microdosimetric spectrum in the beam of, for instance, a clinical linear accelerator. The concept lends itself also for a mini multi-element version of the counter to be used for applications in which a high sensitivity is required. In this paper, we present the first microdosimetric measurements of this novel counter exposed to a 14 MeV monoenergetic neutron beam and a californium (252Cf) source for a counter cavity diameter of 1.8 mm simulating 1.0 microm tissue site size. The measured spectra showed an excellent agreement with spectra from the literature. The specific advantages of the TEPC-GEM are discussed.

摘要

一种基于气体电子倍增器（GEM）的新型微型多元素组织等效正比计数器（TEPC）已被设计并制造出来。这种计数器特别适合构建一个小的灵敏体积，以便它可用于强脉冲辐射场中的微剂量学，来测量例如临床直线加速器束流中的微剂量谱。该概念也适用于计数器的微型多元素版本，用于需要高灵敏度的应用中。在本文中，我们展示了这种新型计数器在暴露于14 MeV单能中子束和锎（252Cf）源时的首次微剂量学测量，计数器腔直径为1.8 mm，模拟1.0微米组织位点大小。测量的谱与文献中的谱显示出极好的一致性。讨论了TEPC-GEM的具体优点。