Kranrod C, Ishikawa T, Tokonami S, Sorimachi A, Chanyotha S, Chankow N
Department of Nuclear Technology, Chulalongkorn University, Phayathai Road, Pratumwan district, Bangkok, Thailand.
Radiat Prot Dosimetry. 2010 Oct;141(4):424-7. doi: 10.1093/rpd/ncq233. Epub 2010 Sep 9.
There is a well-known discrepancy between dosimetrically derived dose conversion factor (DCF) and epidemiologically derived DCF for radon. As the latter DCFs, International Commission on Radiological Protection (ICRP) recommends a value of ∼6.4 nSv (Bq h m(-3))(-1) and 7.9 nSv (Bq h m(-3))(-1) for radon decay products (RnDP) in dwellings and workplaces, respectively. On the other hand, the dosimetric calculations based on the ICRP-66 respiratory tract model derived a DCF of 13 nSv (Bq h m(-3))(-1) and 17 nSv (Bq h m(-3))(-1) for RnDP in dwellings and workplaces, respectively, and 83 nSv (Bq h m(-3))(-1) for thoron decay products (TnDP) in dwellings. In addition, the DCFs derived from both approaches and UNSCEAR were applied to comparative dosimetry for two thoron-enhanced areas (cave dwellings in China and dwellings at a spa town in Japan), where the equilibrium equivalent concentration of radon and equilibrium equivalent concentration of thoron have been measured. In the case of the spa town dwellings, the dose from TnDP was larger than the dose from RnDP.
对于氡，剂量学得出的剂量转换因子（DCF）与流行病学得出的DCF之间存在一个众所周知的差异。作为后者的DCF，国际放射防护委员会（ICRP）分别建议住宅和工作场所中氡衰变产物（RnDP）的值约为6.4 nSv (Bq h m(-3))(-1) 和7.9 nSv (Bq h m(-3))(-1)。另一方面，基于ICRP - 66呼吸道模型的剂量学计算得出，住宅和工作场所中RnDP的DCF分别为13 nSv (Bq h m(-3))(-1) 和17 nSv (Bq h m(-3))(-1)，而住宅中钍射气衰变产物（TnDP）的DCF为83 nSv (Bq h m(-3))(-1)。此外，将这两种方法以及联合国原子辐射效应科学委员会（UNSCEAR）得出的DCF应用于两个钍射气增强区域（中国的窑洞和日本一个温泉镇的住宅）的比较剂量学研究，在这些区域已经测量了氡的平衡当量浓度和钍射气的平衡当量浓度。对于温泉镇的住宅，TnDP产生的剂量大于RnDP产生的剂量。
