Roberts, N J; Bennett, A; Cheema, S S (2023) Photon spectra in NPL standard monoenergetic neutron fields. Radiation Protection Dosimetry, 199 (15-16). pp. 1685-1688.

Roberts, N J; Thiam, C; Capogni, M; Silvi, L (2021) Subsequent comparison of measurements of neutron Source emission rate (2016-17) – CCRI(III)-K9.AmBe.2. Metrologia, 58 (1A). 06025

Thomas, D J; Roberts, N J (2018) Characterisation of a long counter for JRC Geel. NPL Report. IR 52

Hawkes, N P; Kolkowski, P; Roberts, N J; Salvador-Castiñeira, P; Taylor, G C; Thomas, D J (2018) Additional characterisation of the Thermal Neutron Pile at the National Physical Laboratory, UK. Radiation Protection Dosimetry, 180 (1-4). pp. 25-28. ISSN 0144-8420

Roberts, N J (2018) Photon Spectra in NPL standard radionuclide neutron fields. Radiation Protection Dosimetry, 180 (1-4). pp. 62-65. ISSN 0144-8420

Salvador-Castiñeira, P; Hambsch, F-J; Göök, A; Vidali, M; Hawkes, N P; Roberts, N J; Taylor, G C; Thomas, D J (2017) Absolute and relative cross section measurements of 237Np(n,f) and 238U(n,f) at the National Physical Laboratory. EPJ Web of Conferences, 146. 04050 ISSN 2100-014X

Roberts, N J; Thomas, D J; Visser, T P P (2017) Improved Bonner sphere neutron spectrometry measurements for the nuclear industry. Radiation Physics and Chemistry, 140. pp. 319-321.

Thomas, D J; Roberts, N J (2017) Absolute neutron emission measurements for two neutron generators. NPL Report. IR 44

Roberts, N J; Jones, L N; Liu, Z Z; Tagziria, H; Thomas, D J (2014) Bonner sphere measurements of 241Am-B and 241Am-F neutron energy spectra unfolded using high resolution a priori data. Radiat. Prot. Dosim., 161 (1-4). pp. 225-228.

Atanackovic, J*; Thomas, D J; Roberts, N J; Witharana, S*; Dubeau, J*; Yonkeu, A* (2014) Correction and verification of AECL Bonner Sphere response function matrix based on mono-energetic neutron calibration performed at NPL. Radiat. Prot. Dosim., 161 (1-4). pp. 216-220.

Hawkes, N P; Roberts, N J (2014) Digital dual-parameter data acquisition for SP2 hydrogen-filled proportional counters. Radiat. Prot. Dosim., 161 (1-4). pp. 253-256.

Lovestam, G*; Nolte, R*; Roberts, N J (2014) EUROMET project 822 'Comparison of neutron fluence measurements for neutron energies of 15.5 MeV, 16 MeV, 17 MeV and 19 MeV' (EUROMET.RI(III)-S2). Metrologia, 51 (1A). 06023.

Gressier, V*; Bonaldi, A C*; Dewey, M S*; Gilliam, D M*; Harano, H*; Masuda, A*; Matsumoto, T*; Moiseev, T*; Nico, J S*; Nolte, R*; Oberstedt, S*; Roberts, N J; Rottger, S*; Thomas, D J (2014) International key comparison of neutron fluence measurements in monoenergetic neutron fields - CCRI(III)-K11. Metrologia, 51 (1A). 06009.

Bedogni, R*; Domingo, C*; Roberts, N J; Thomas, D J; Chiti, M*; Esposito, A*; Garcia, M J*; Gentile, A*; Liu, Z Z*; de-San-Pedro, M* (2014) Investigation of the neutron spectrum of americium-beryllium sources by Bonner sphere spectrometry. Nucl. Instrum. Methods Phys. Res. A, Accel. Spectrom. Detec. Assoc. Equip., 763. pp. 547-552.

Roberts, N J; Horwood, N A; McKay, C J (2014) Photon doses in NPL standard neutron fields. Radiat. Prot. Dosim., 161 (1-4). pp. 157-160.

Roberts, N J; Jones, L N; Wang, Z*; Liu, Y*; Wang, Q*; Chen, X*; Luo, H*; Rong, C*; Kralik, M*; Park, H*; Choi, K O*; Pereira, W W*; da Fonseca, E S*; Cassette, P*; Dewey, M S*; Moiseev, N N*; Kharitonv, I A* (2011) International key comparison of measurements of neutron source emission rate (1999-2005): CCRI(III)-K9.AmBe. Metrologia, 48 (Techni). 06018.

Roberts, N J; Moiseev, N M*; Kralik, M* (2011) Radionuclide neutron source characterization techniques. Metrologia, 48 (6). S239-S253

Roberts, N J; Thomas, D J; Lacoste, V*; Böttger, R*; Loeb, S* (2010) Comparison of long counter measurements of monoenergetic and radionuclide source-based neutron fluence. Radiat. Meas., 45 (10). pp. 1151-1153.

Roberts, N J; Parfitt, M J (2010) MCNPX modelling of the NPL manganese bath facility based on a converted CAD model. Radiat. Meas., 45 (10). pp. 1346-1349.

Roberts, N J; Jones, L N (2010) Recent developments in radionuclide neutron source emission rate measurements at the National Physical Laboratory. Appl. Radiat. Isot., 68 (4-5). pp. 626-630.

Hawkes, N P; Bennett, A; Roberts, N J (2008) Measuring quasi-monoenergetic neutron spectra with the NPL Time-of-Flight system. NPL Report. IR 10

Roberts, N J; Duane, S; Judge, S M; de Lavison, P A G; Rayner, D; Thomas, D J; Zeqiri, B (2007) Proposed NMS programme for acoustics and ionising radiation metrology - October 2007 to September 2010: public comment. NPL Report. DQL-RN 020

Thomas, D J; Hawkes, N P; Jones, L N; Kolkowski, P; Roberts, N J (2007) Characterization and utilization of a bonner sphere set based on gold activation foils. Radiat. Prot. Dosim., 126 (1-4). pp. 229-233.

Hawkes, N P; Bennett, A; Cheema, S S; Horwood, N A; Jones, L N; Kolkowski, P; Roberts, N J; Taylor, G C; Thomas, D J (2007) Progress in providing neutron standards at the UK National Physical Laboratory. Nucl. Instrum. Methods Phys. Res. A, Accel. Spectrom. Detec. Assoc. Equip., 580. pp. 183-185.

Thomas, D J; Kolkowski, P; Roberts, N J; Mellow, B D*; Joyce, M J* (2006) Investigation of a possible replacement for cadmium as a thermal neutron absorbing material in neutron instruments. NPL Report. DQL-RN 017

Roberts, N J; Jones, L N (2005) The NPL contribution to a CCRI international comparison of measurements of neutron source emission rate. NPL Report. DQL-RN 013

Tanner, R J*; Bartlett, D T*; Hager, L G*; Jones, L N; Molinos, C*; Roberts, N J; Taylor, G C; Thomas, D J (2005) Modelling of neutron survey instrument performance and experimental validation of those calculated response data. Radiat. Prot. Dosim., 116 (1-4). pp. 406-410.

Roberts, N J; Tagziria, H; Thomas, D J (2004) Determination of the effective centres of the NPL long counters. NPL Report. DQL-RN 004

Roberts, N J; Jones, L N (2004) Investigation of the implications of 250Cf and 248Cm in 252Cf neutron sources. NPL Report. DQL-RN 005

Gressier, V*; Lacoste, V*; Lebreton, L*; Muller, H*; Pelcot, G*; Bakali, M*; Fernandez, F*; Tomas, M*; Roberts, N J; Thomas, D J; Reginatto, M*; Wiegel, B*; Wittstock, J* (2004) Characterization of the IRSN facility CANEL/T400 producing realistic neutron fields for calibration and test purposes. Technical Report. Institut de Radioprotection et de Surete Nucleaire.

Roberts, N J; Bartlett, D T*; Hager, L G*; Jones, L N; Molinos, C*; Tanner, R J*; Taylor, G C; Thomas, D J (2004) Angle dependence of response characteristics of neutron survey instruments. Radiat. Prot. Dosim., 110 (1-4). pp. 187-193.

Gressier, V*; Lacoste, V*; Lebreton, L*; Muller, H*; Pelcot, G*; Bakali, M*; Fernández, F*; Tómas, M*; Roberts, N J; Thomas, D J; Reginatto, M*; Wiegel, B*; Wittstock, J* (2004) Characterization of the IRSN CANEL/T400 facility producing realistic neutron fields for calibration and test purposes. Radiat. Prot. Dosim., 110 (1-4). pp. 523-527.

Gressier, V*; Lacoste, V*; Lebreton, L*; Muller, H*; Pelcot, G*; Bakali, M*; Fernández, F*; Tómas, M*; Roberts, N J; Thomas, D J; Reginatto, M*; Wiegel, B*; Wittstock, J* (2004) Characterization of the IRSN CANEL/T400 facility producing realistic neutron fields for calibration and test purposes. Radiat. Prot. Dosim., 110. pp. 523-527.

Gressier, V*; Lacoste, V*; Lebreton, L*; Muller, H*; Pelcot, G*; Bakali, M*; Fernández, F*; Tómas, M*; Roberts, N J; Thomas, D J; Reginatto, M*; Wiegel, B*; Wittstock, J* (2004) Characterization of the IRSN CANEL/T400 facility producing realistic neutron fields for calibration and test purposes. Radiat. Prot. Dosim., 110. pp. 523-527.

Tanner, R J*; Bartlett, D T*; Hager, L G*; Jones, L N; Molinos, C*; Roberts, N J; Taylor, G C; Thomas, D J (2004) Practical implications of neutron survey instrument performance. Radiat. Prot. Dosim., 110 (1-4). pp. 763-767.

Tagziria, T; Roberts, N J; Thomas, D J (2003) Measurement of the 241Am-Li radionuclide neutron source spectrum. Nucl. Instrum. Methods Phys. Res. A, Accel. Spectrom. Detec. Assoc. Equip., 510. pp. 346-356.

Thomas, D J; Roberts, N J; Bennett, A; Kolkowski, P (2002) The NPL contribution to a CCRI international comparison of fast neutron fluence measurements performed at the PTB in March 2001. NPL Report. CIRM 51

Roberts, N J (2001) MCNP calculations of correction factors for radionuclide neutron source emission rate measurements using the manganese bath. NPL Report. CIRM 45