Improvement of neutron detection efficiency with high sensitive CR-39 track detector

Oda, Keiji; Ichijo, H; Miyawaki, Nobumasa; Yamauchi, Tomoya; Nakane, Yoshibumi

doi:10.1016/s1350-4487(01)00145-7

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…From the kinematics of the reaction, it appears that neutrons are produced preferentially at a forward angle with respect to the incoming proton direction, 44,45 the maximum neutron emission angle getting larger with the proton kinetic energy. For the few produced by the highest energy protons up to 6 MeV, their kinetic energy is up to ∼2.6 MeV where the CR-39 response efficiency 46,47 is of the order of 10 −4 . Neutron tracks inside CR-39 track detectors are not an issue in our experiment.…”

Section: Application To a Proton-boron Fusion Experimentsmentioning

confidence: 99%

CR-39 track detector calibration for H, He, and C ions from 0.1-0.5 MeV up to 5 MeV for laser-induced nuclear fusion product identification

Baccou

Yahia

Depierreux

et al. 2015

Review of Scientific Instruments

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Laser-accelerated ion beams can be used in many applications and, especially, to initiate nuclear reactions out of thermal equilibrium. We have experimentally studied aneutronic fusion reactions induced by protons accelerated by the Target Normal Sheath Acceleration mechanism, colliding with a boron target. Such experiments require a rigorous method to identify the reaction products (alpha particles) collected in detectors among a few other ion species such as protons or carbon ions, for example. CR-39 track detectors are widely used because they are mostly sensitive to ions and their efficiency is near 100%. We present a complete calibration of CR-39 track detector for protons, alpha particles, and carbon ions. We give measurements of their track diameters for energy ranging from hundreds of keV to a few MeV and for etching times between 1 and 8 h. We used these results to identify alpha particles in our experiments on proton-boron fusion reactions initiated by laser-accelerated protons. We show that their number clearly increases when the boron fuel is preformed in a plasma state.

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Section: Application To a Proton-boron Fusion Experimentsmentioning

confidence: 99%

CR-39 track detector calibration for H, He, and C ions from 0.1-0.5 MeV up to 5 MeV for laser-induced nuclear fusion product identification

Baccou

Yahia

Depierreux

et al. 2015

Review of Scientific Instruments

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“…The directional distribution of induced recoil protons is also not isotropic and the forward scatterings have a large contribution: thus, we conducted Monte Carlo calculations to estimate the actual CF applicable to the conditions of our experiment, as described in §3. 4.…”

Section: Count Factormentioning

confidence: 99%

“…Figure 5 shows R LET/REL for protons, 4 He, 12 C, and 16 O. The high energy limit of R LET/REL is 0.19.…”

Section: R Let/relmentioning

confidence: 99%

“…For high-energy neutron dosimetry, a variety of CR-39 detectors have been devised. [2][3][4][5] An enormous effort has been made to increase neutron sensitivities (secondary-particle tracks per incident neutron), and to ensure that the variation of neutron sensitivities as a function of neutron energy fits the relationship of dose per neutron fluence to neutron energy (thermal to tens of MeV or more) recommended by the International Commission on Radiological Protection (ICRP). However, the CR-39 detector responses based on the track counting method are insufficient for measuring the high-energy neutron component.…”

Section: Introductionmentioning

confidence: 99%

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Dosimetry for Neutrons from 0.25 to 15 MeV by the Measurement of Linear Energy Transfer Distributions for Secondary Charged Particles in CR-39 Plastic

Tawara¹,

Eda²,

Sanami³

et al. 2008

jjap

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In the radiation fields of high energy accelerator facilities, high-altitude aircraft and space flights, high-energy neutron dosimetry of $20 MeV or more is a significant issue for radiological protection. We studied the feasibility of experimental measurements of linear energy transfer (LET) distributions for secondary charged particles induced by fast neutrons using CR-39 plastic nuclear track detectors. In order to investigate a method of analyzing the CR-39 detectors that is appropriate for fast neutron dosimetry, two-layer CR-39 stacks were exposed to monochromatic neutrons (0.25, 0.55, 5, and 15 MeV) at the Fast Neutron Laboratory of Tohoku University in Japan. We also conducted Monte Carlo calculations to estimate the detection efficiency of the CR-39 detector for recoil protons. The CR-39 detectors treated by single-step chemical etching were used to obtain LET distributions for LET > 10 keV/mm-water. The results indicated that measurements of short-range particles are very important for obtaining the correct LET distributions. Using the measured LET distributions, we calculated neutron sensitivities, absorbed doses and dose equivalents based on the ICRP 60 Q-L relation and averaged quality factors. The dose equivalents were compared with the neutron fluence-to-dose equivalent conversion factors given by ICRP 74 and the averaged quality factors were compared with weighting factors given by ICRP 60 and ICRP 92.

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“…It plays an important role in commercial applications involving both the radiation processing of polymeric materials and the use of polymers in certain optical devices in radiation environments [5,6]. Numerous publications have dealt with the investigation of the color changes in irradiated polymers and the use of CR-39 detectors in radiation dosimetry [7][8][9][10][11][12][13][14][15][16][17][18]. Some of these publications have reported that, in some SSNTDs, noticeable changes in color are caused by very small radiation doses, which can be used for dosimetry purposes.…”

Section: Introductionmentioning

confidence: 99%

Color changes in CR-39 nuclear track detector by gamma and laser irradiation

Nouh

Said

Atta

et al. 2006

Radiation Effects and Defects in Solids

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A study of the effect of gamma and laser irradiation on the color changes of polyallyl diglycol (CR-39) solid-state nuclear track detector was performed. CR-39 detector samples were classified into two main groups. The first group was irradiated with gamma doses at levels between 20 and 300 kGy, whereas the second group was exposed to infrared laser radiation with energy fluences at levels between 0.71 and 8.53 J/cm 2 . The transmission of these samples in the wavelength range 300-2500 nm, as well as any color changes, was studied. Using the transmission data, both the tristimulus and the coordinate values of the Commission Internationale de l'Eclairage (CIE) LAB were calculated. Also, the color differences between the non-irradiated samples and those irradiated with different gamma or laser doses were calculated. The results indicate that the CR-39 detector acquires color changes under gamma or laser irradiation, but it has more response to color changes by gamma irradiation.In addition, structural property studies using infrared spectroscopy were performed. The results indicate that the irradiation of a CR-39 detector with gamma or laser radiations causes the cleavage of the carbonate linkage that can be attributed to the −H abstraction from the backbone of the polymer, associated with the formation of CO 2 and −OH with varying intensities.

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Improvement of neutron detection efficiency with high sensitive CR-39 track detector

Cited by 8 publications

References 11 publications

CR-39 track detector calibration for H, He, and C ions from 0.1-0.5 MeV up to 5 MeV for laser-induced nuclear fusion product identification

CR-39 track detector calibration for H, He, and C ions from 0.1-0.5 MeV up to 5 MeV for laser-induced nuclear fusion product identification

Dosimetry for Neutrons from 0.25 to 15 MeV by the Measurement of Linear Energy Transfer Distributions for Secondary Charged Particles in CR-39 Plastic

Color changes in CR-39 nuclear track detector by gamma and laser irradiation

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