Effects of thermal neutrons on living cells. 1. Lethal effects of thermal neutrons on amoebae.
نویسندگان
چکیده
Lethal effects of thermal neutrons were compared with those of 60Co-ƒÁ-rays on the two types of Amoeba proteus. D37 doses against ƒÁ-rays were 2.5 •~ 105 (M-type) and 7.2 •~ 105 rads (P type), and those for thermal neutrons were 9.1 and 11.7 •~ 1013 n. cm-2 (total flux) respectively. Additions of AET, D2O or boron failed to increase or decrease the lethal effects of thermal neutrons. The lethal actions by thermal neutrons must arise by the nuclear reaction, namely, 31P (n ,ƒÁ) 32P on DNA strands. When amoebae were irradiated by thermal neutrons on pre-ƒÁirradiated status, the lethal actions were markedly enhanced (ƒÁ-n effect).
منابع مشابه
Effects of thermal neutrons on living cells. III. Estimation of absorbed dose in amoeba irradiated by thermal neutrons.
河 合建一,牧 廣 利,赤 星光彦1京 都大学原子炉実験所,大 阪府泉南郡熊取町 野田,〒590-04 An absorbed dose in amoeba irradiated by thermal neutrons was estimated. Nuclear events following to thermal neutron capture were divided into 6 parts. More than 99% of absorbed dose was estimated to be due to capture ƒÁ-rays. Absorbed dose due to recoil nucleus following to the emission of capture ƒÁ-rays and that due to ƒÀor ƒÁ-rays emitted ...
متن کاملEffects of thermal neutrons on living cells. II. Combined effects of thermal neutrons and several agents which interact with DNA.
牧 広利,河 合建一,赤 星光彦:京 都大学原子炉実験所,大 阪府泉南郡熊取町野田,〒590-04 In order to understand the further mechanisms of lethal actions of thermal neutrons, the combined effects of thermal neutrons and several chemical agents which interact with DNA, mainly bleomycin and actinomycin D, have been studied. Marked sensitization was observed with bleomycin even in its lower concentration, while in the case of actinomyci...
متن کاملA review on neutron shielding performance of nano-composite materials
Neutron sources employed in different applications in both medicine and industry. Due to the harmful effects of neutron particles on living organisms, radiation shields have played a vital role in radiation protection against neutrons. In recent decade, numerous investigations conducted on the design and fabrication of nanocomposites as more efficient shielding materials against fast and therma...
متن کاملA Monte Carlo study on Photoneutron Spectrum around Elekta SL75/25 18 MV linear accelerator
Medical linear accelerators are one of the most widespread methods for cancer treatment. Despite their advantages, unwanted photoneutrons are produced by high energy linacs. This photoneutrons are as undesired doses to patients and a significant problem for radiation protection of the staffs and patients. Photoneutrons radiological risk must be evaluated because of their high LET and range.in o...
متن کاملA Monte Carlo study on Photoneutron Spectrum around Elekta SL75/25 18 MV linear accelerator
Medical linear accelerators are one of the most widespread methods for cancer treatment. Despite their advantages, unwanted photoneutrons are produced by high energy linacs. This photoneutrons are as undesired doses to patients and a significant problem for radiation protection of the staffs and patients. Photoneutrons radiological risk must be evaluated because of their high LET and range.in o...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Journal of radiation research
دوره 14 4 شماره
صفحات -
تاریخ انتشار 1973