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Comment on “modelling of radiolysis of reactor cooling water—A comparative study”
866
Note, to the Editor
COMMENT ON "MODELLING OF RADIOLYSIS OF REACTOR COOLING W A T E R m A COMPARATIVE STUDY" J. BROWN Mctalluripcal Research Department, Research Div~on, Ontario Hydro, 800 Kipling Avenue, Toronto, Ontario,Canada MSZ 5S4 (Recewed 2 October 1989)
With reference to the above-mentioned paper (Lukac, 1989), 1 wish to make it clear that the paper did not go through Ontario Hydro Research Division's review and approval process. The content of the paper, therefore, should not be considered to
represent Ontario Hydro's position in this technical area.
Lukac S. R. 0989) P_,~_~t. Phys. Chem. 33, 223.
EFFECT OF ELECTRON BEAM IRRADIATION ON ELECTRICAL CONDUCTIVITY OF TRIETHYLAMINET E T R A C Y A N O Q U I N O D I M E T H A N E COMPLEX MA..q,AO TAMADA, M ~ R u
ASANO, MASARUYO~41DA and MtNOtU KUMAKURA Japan Atonuc Enersy Research Institute, Takataki Radiation Chemistry Establishment, Watanuki-machi 1233. Takasaki. Gumma 370-12. Jal~n (Received 17 October 1989)
Organic electrical conductors have attracted special interest recently. These materials have been used as irradiation dose sensors (Yoshino et ol., 1983a), humidity sensors (Yoshino et aL, 1983b) amine gas senson= (Yoshino and Gu, 1986), secondary batteries (Kaneto et al., 1983) and solar bcttteries (Tsukamoto, 1982). In the case of irradiation dose sensors, electrically conductive materials have a conjugated structure so that they originally show resistance to irradiation. To use them as irradiation dose sensors, these materials must be irradiated in an atmosphere of a dopant gas such as SF~. Nevertheless, one merit is that the change in electricalconductivity induced by the irradiation is easy to measure. Trierhylamine-tetracyanoquinodimethane (TEAT C N Q ) complex is a electricallyconductive anion radical salt (Melby et at., 1962). T E A - T C N Q complex forms two stoichiometricallydifferentsalts. One is T E A ( T C N Q ) and the other is TEA(TCNQ)2. T E A ( T C N Q ) 2 (20fi-cm, 5 x 10-2Scm -~ has higher electric conductivity than T E A ( T C N Q ) (10+Q-cm, I x I0-* S cm- t) when compacted. In this study, the former complex was irradiated by electron beam in air and its electrical conductivity investigated, since we noticed that its electrical conductivity depended on irradiation dose. T E A - T C N Q complex was synthesized aocording to Melby et al. (1962). The crystals of TEA-TCNQ
complex were reduced to powder with a mill (Simazu Co. Ltd, Vibration Mill) and were compressed into pellets (1.3 cm in diameter and 0.05 cm in thickness). Both sides of the p r e l x u ~ pellets were painted with electrical conductive paste (Fujikura K a ~ Co., Ltd, Dot/re D-550); the pellets were then u ~ d for electrical conductivity ~ L Conductivity was mmmted with an LCR meter (Yokogawa-Hewlett-Packard Ltd 4274A) under I kHz alternatingcurrent at 25°C. TEA-TCNQ complex has anisotropic electrical conductivity. While the conductivities along the three axes were 7.4,4.5 x I0- 2 and 2.6 x I0 ~ S c m - *, respectively, the conductivity of compacted pellets prepared from milled powder was 9 x 10-2Scm -* (Brau and Farges, 1974). Thus, we investigated the effect on conductivity of the pressure used to compress the powder. Compacted pellets were prepared under different pressures. Figure I shows the effect of presture on the conductivity of the pellets. The conductivity (3.7× 1 0 2 S c m -~) was independent of the ~ u r e used to prepare pellets. This result suggests that a pressure of 1 0 M P a is enough not only to form pellets,but also to force powders to adhere to each other, thus overcoming contact re~s~nce. Figure 2 shows a cross section of a compacted pellet. This pellet was compressed at 40 MPa. As a result,particlesadhered closelyto each other, as shown in Fig. 2.
Note, to the Editor
COMMENT ON "MODELLING OF RADIOLYSIS OF REACTOR COOLING W A T E R m A COMPARATIVE STUDY" J. BROWN Mctalluripcal Research Department, Research Div~on, Ontario Hydro, 800 Kipling Avenue, Toronto, Ontario,Canada MSZ 5S4 (Recewed 2 October 1989)
With reference to the above-mentioned paper (Lukac, 1989), 1 wish to make it clear that the paper did not go through Ontario Hydro Research Division's review and approval process. The content of the paper, therefore, should not be considered to
represent Ontario Hydro's position in this technical area.
Lukac S. R. 0989) P_,~_~t. Phys. Chem. 33, 223.
EFFECT OF ELECTRON BEAM IRRADIATION ON ELECTRICAL CONDUCTIVITY OF TRIETHYLAMINET E T R A C Y A N O Q U I N O D I M E T H A N E COMPLEX MA..q,AO TAMADA, M ~ R u
ASANO, MASARUYO~41DA and MtNOtU KUMAKURA Japan Atonuc Enersy Research Institute, Takataki Radiation Chemistry Establishment, Watanuki-machi 1233. Takasaki. Gumma 370-12. Jal~n (Received 17 October 1989)
Organic electrical conductors have attracted special interest recently. These materials have been used as irradiation dose sensors (Yoshino et ol., 1983a), humidity sensors (Yoshino et aL, 1983b) amine gas senson= (Yoshino and Gu, 1986), secondary batteries (Kaneto et al., 1983) and solar bcttteries (Tsukamoto, 1982). In the case of irradiation dose sensors, electrically conductive materials have a conjugated structure so that they originally show resistance to irradiation. To use them as irradiation dose sensors, these materials must be irradiated in an atmosphere of a dopant gas such as SF~. Nevertheless, one merit is that the change in electricalconductivity induced by the irradiation is easy to measure. Trierhylamine-tetracyanoquinodimethane (TEAT C N Q ) complex is a electricallyconductive anion radical salt (Melby et at., 1962). T E A - T C N Q complex forms two stoichiometricallydifferentsalts. One is T E A ( T C N Q ) and the other is TEA(TCNQ)2. T E A ( T C N Q ) 2 (20fi-cm, 5 x 10-2Scm -~ has higher electric conductivity than T E A ( T C N Q ) (10+Q-cm, I x I0-* S cm- t) when compacted. In this study, the former complex was irradiated by electron beam in air and its electrical conductivity investigated, since we noticed that its electrical conductivity depended on irradiation dose. T E A - T C N Q complex was synthesized aocording to Melby et al. (1962). The crystals of TEA-TCNQ
complex were reduced to powder with a mill (Simazu Co. Ltd, Vibration Mill) and were compressed into pellets (1.3 cm in diameter and 0.05 cm in thickness). Both sides of the p r e l x u ~ pellets were painted with electrical conductive paste (Fujikura K a ~ Co., Ltd, Dot/re D-550); the pellets were then u ~ d for electrical conductivity ~ L Conductivity was mmmted with an LCR meter (Yokogawa-Hewlett-Packard Ltd 4274A) under I kHz alternatingcurrent at 25°C. TEA-TCNQ complex has anisotropic electrical conductivity. While the conductivities along the three axes were 7.4,4.5 x I0- 2 and 2.6 x I0 ~ S c m - *, respectively, the conductivity of compacted pellets prepared from milled powder was 9 x 10-2Scm -* (Brau and Farges, 1974). Thus, we investigated the effect on conductivity of the pressure used to compress the powder. Compacted pellets were prepared under different pressures. Figure I shows the effect of presture on the conductivity of the pellets. The conductivity (3.7× 1 0 2 S c m -~) was independent of the ~ u r e used to prepare pellets. This result suggests that a pressure of 1 0 M P a is enough not only to form pellets,but also to force powders to adhere to each other, thus overcoming contact re~s~nce. Figure 2 shows a cross section of a compacted pellet. This pellet was compressed at 40 MPa. As a result,particlesadhered closelyto each other, as shown in Fig. 2.